Owner's Manual for Lenovo models including: 12JM001TPB, 12JM001TPB Think Centre M90a Pro Gen 4 All In One Desktop PC, 12JM001TPB, Think Centre M90a Pro Gen 4 All In One Desktop PC, M90a Pro Gen 4 All In One Desktop PC, All In One Desktop PC, Desktop PC, PC
Lenovo 12JM001TPB
Lenovo 12JM000QPB
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DocumentDocumentM90a Pro Gen4 Hardware Maintenance Manual Second Edition (February 2025) © Copyright Lenovo 2023, 2025. LIMITED AND RESTRICTED RIGHTS NOTICE: If data or software is delivered pursuant to a General Services Administration "GSA" contract, use, reproduction, or disclosure is subject to restrictions set forth in Contract No. GS35F-05925. Contents About this manual . . . . . . . . . . . .iii Chapter 1. Important safety information . . . . . . . . . . . . . . . . 1 General safety . . . . . . . . . . . . . . . . 1 Electrical safety . . . . . . . . . . . . . . . . 2 Safety inspection guide . . . . . . . . . . . . . 3 Handling electrostatic discharge-sensitive devices . . . . . . . . . . . . . . . . . . . 4 Grounding requirements . . . . . . . . . . . . 4 Safety notices (multi-lingual translations) . . . . . . 4 Chapter 2. Important service information . . . . . . . . . . . . . . . 27 Strategy for replacing FRUs . . . . . . . . . . 27 Strategy for replacing a hard disk drive or a solid-state drive . . . . . . . . . . . . . 27 Important notice for replacing a system board . . . . . . . . . . . . . . . . . 27 How to use error codes . . . . . . . . . . 28 Strategy for replacing FRUs for CTO, special-bid, and standard models. . . . . . . . . . . . . 28 Product definition . . . . . . . . . . . . 28 FRU identification . . . . . . . . . . . . 28 Chapter 3. Product overview . . . . . 29 Front . . . . . . . . . . . . . . . . . . . 29 Rear . . . . . . . . . . . . . . . . . . . 31 Chapter 4. Service checkout and symptom-to-FRU index . . . . . . . . 33 Service checkout . . . . . . . . . . . . . . 33 Problem determination tips . . . . . . . . 33 Symptom-to-FRU index . . . . . . . . . . . 34 Hard disk drive boot error . . . . . . . . . 34 Power supply problems . . . . . . . . . . 35 Beep symptoms . . . . . . . . . . . . . 35 POST error codes . . . . . . . . . . . . 36 Miscellaneous error conditions . . . . . . . 37 Undetermined problems . . . . . . . . . 39 Recover from a BIOS update failure . . . . . 39 Clear CMOS . . . . . . . . . . . . . . 40 Chapter 5. Diagnostics . . . . . . . . 41 Basic procedure for resolving computer problems . . . . . . . . . . . . . . . . . 41 UEFI diagnostic program . . . . . . . . . . . 41 Lenovo diagnostic tools . . . . . . . . . . . 42 Use the Vantage app . . . . . . . . . . . . . 42 Self-help resources . . . . . . . . . . . . . 42 Chapter 6. Hardware removal and installation . . . . . . . . . . . . . . . 45 Handling static-sensitive devices . . . . . . . . 45 Service tool kit . . . . . . . . . . . . . . . 45 Major FRUs and CRUs . . . . . . . . . . . . 47 System board . . . . . . . . . . . . . . . 51 Removing and installing hardware . . . . . . . 52 External options . . . . . . . . . . . . . 52 Computer stand . . . . . . . . . . . . . 52 Rear I/O cover . . . . . . . . . . . . . 55 System board shield . . . . . . . . . . . 56 OSD button and OSD bracket . . . . . . . 57 VESA mount bracket . . . . . . . . . . . 58 Cover presence switch (intrusion switch) . . . 59 Hard disk drive . . . . . . . . . . . . . 60 Optical drive . . . . . . . . . . . . . . 60 M.2 solid-state drive . . . . . . . . . . . 62 Thunderbolt card . . . . . . . . . . . . 63 Memory module . . . . . . . . . . . . . 64 Wi-Fi card and Wi-Fi card shield . . . . . . 65 Card reader board . . . . . . . . . . . . 65 GPU card . . . . . . . . . . . . . . . 66 System fan . . . . . . . . . . . . . . . 67 Heat sink . . . . . . . . . . . . . . . 68 Microprocessor . . . . . . . . . . . . . 69 System board . . . . . . . . . . . . . . 70 Coin-cell battery . . . . . . . . . . . . . 71 Integrated camera and microphone module . . 73 Power supply assembly . . . . . . . . . . 73 Side I/O bezel . . . . . . . . . . . . . . 75 Right bezel . . . . . . . . . . . . . . . 75 Internal speakers . . . . . . . . . . . . 76 Main frame . . . . . . . . . . . . . . . 77 Wi-Fi antennas . . . . . . . . . . . . . 78 Front decoration cover . . . . . . . . . . 79 LCD bracket and LCD panel . . . . . . . . 80 Chapter 7. Notices and trademarks . . . . . . . . . . . . . . . 83 © Copyright Lenovo 2023, 2025 i ii M90a Pro Gen4 Hardware Maintenance Manual About this manual This manual provides service and reference information for ThinkCentre® computers listed on the front cover. Illustrations in this manual might look different from your product. Use this manual along with the advanced diagnostic tests to troubleshoot problems. Important: It is recommended that these products be repaired by trained service technicians. For customers electing to repair their own ThinkCentre products, please follow all instructions carefully. Use this manual along with the advanced diagnostic tests to troubleshoot problems effectively. Before servicing a ThinkCentre computer, be sure to read and understand Chapter 1 "Important safety information" on page 1. © Copyright Lenovo 2023, 2025 iii iv M90a Pro Gen4 Hardware Maintenance Manual Chapter 1. Important safety information General safety Follow these rules to ensure general safety: · Observe good housekeeping in the area of the machines during and after maintenance. · When lifting any heavy object: 1. Ensure you can stand safely without slipping. 2. Distribute the weight of the object equally between your feet. 3. Use a slow lifting force. Never move suddenly or twist when you attempt to lift. 4. Lift by standing or by pushing up with your leg muscles; this action removes the strain from the muscles in your back. Attention: Do not attempt to lift any objects that weigh more than 16 kg (35 lb) or objects that you think are too heavy for you. · Do not perform any action that causes hazards to the customer, or that makes the equipment unsafe. · Before you start the machine, ensure that other people are not in a hazardous position. · Place removed covers and other parts in a safe place, away from all personnel, while you are servicing the machine. · Keep your tool case away from walk areas so that other people will not trip over it. · Do not wear loose clothing that can be trapped in the moving parts of a machine. Ensure that your sleeves are fastened or rolled up above your elbows. If your hair is long, fasten it. · Insert the ends of your necktie or scarf inside clothing or fasten it with a nonconductive clip, approximately 8 centimeters (3 inches) from the end. · Do not wear jewelry, chains, metal-frame eyeglasses, or metal fasteners for your clothing. Remember: Metal objects are good electrical conductors. · Wear safety glasses when you are: hammering, drilling, soldering, cutting wire, attaching springs, using solvents, or working in any other conditions that might be hazardous to your eyes. · After service, reinstall all safety shields, guards, labels, and ground wires. Replace any safety device that is worn or defective. · Reinstall all covers correctly before returning the machine to the customer. CAUTION: Keep fingers and other parts of your body away from hazardous, moving parts. If you suffer an injury, seek medical care immediately. CAUTION: Avoid contact with hot components inside the computer. During operation, some components become hot enough to burn the skin. Before you open the computer cover, turn off the computer, disconnect power, and wait approximately 10 minutes for the components to cool. © Copyright Lenovo 2023, 2025 1 Electrical safety CAUTION: Electrical current from power, telephone, and communication cables can be hazardous. To avoid personal injury or equipment damage, disconnect the attached power cords, telecommunication systems, networks, and modems before you open the computer covers, unless instructed otherwise in the installation and configuration procedures. Observe the following rules when working on electrical equipment. Important: Use only approved tools and test equipment. Some hand tools have handles covered with a soft material that does not insulate you when working with live electrical currents. Many customers have, near their equipment, rubber floor mats that contain small conductive fibers to decrease electrostatic discharges. Do not use this type of mat to protect yourself from electrical shock. · Find the room emergency power-off (EPO) switch, disconnecting switch, or electrical outlet. If an electrical accident occurs, you can then operate the switch or unplug the power cord quickly. · Do not work alone under hazardous conditions or near equipment that has hazardous voltages. · Disconnect all power before: Performing a mechanical inspection Working near power supplies Removing or installing Field Replaceable Units (FRUs) · Before you start to work on the machine, unplug the power cord. If you cannot unplug it, ask the customer to power-off the wall box that supplies power to the machine and to lock the wall box in the off position. · If you need to work on a machine that has exposed electrical circuits, observe the following precautions: Ensure that another person, familiar with the power-off controls, is near you. Remember: Another person must be there to switch off the power, if necessary. Use only one hand when working with powered-on electrical equipment; keep the other hand in your pocket or behind your back. Remember: There must be a complete circuit to cause electrical shock. By observing the above rule, you may prevent a current from passing through your body. When using a tester, set the controls correctly and use the approved probe leads and accessories for that tester. Stand on suitable rubber mats (obtained locally, if necessary) to insulate you from grounds such as metal floor strips and machine frames. Observe the special safety precautions when you work with very high voltages; these instructions are in the safety sections of maintenance information. Use extreme care when measuring high voltages. · Regularly inspect and maintain your electrical hand tools for safe operational condition. · Do not use worn or broken tools and testers. · Never assume that power has been disconnected from a circuit. First, check that it has been powered-off. · Always look carefully for possible hazards in your work area. Examples of these hazards are moist floors, nongrounded power extension cables, power surges, and missing safety grounds. · Do not touch live electrical circuits with the reflective surface of a plastic dental mirror. The surface is conductive; such touching can cause personal injury and machine damage. · Do not service the following parts with the power on when they are removed from their normal operating places in a machine: 2 M90a Pro Gen4 Hardware Maintenance Manual Power supply units Pumps Blowers and fans Motor generators and similar units. (This practice ensures correct grounding of the units.) · If an electrical accident occurs: Use caution; do not become a victim yourself. Switch off power. Send another person to get medical aid. Safety inspection guide The intent of this inspection guide is to assist you in identifying potentially unsafe conditions on these products. Each machine, as it was designed and built, had required safety items installed to protect users and service personnel from injury. This guide addresses only those items. However, good judgment should be used to identify potential safety hazards due to attachment of features or options not covered by this inspection guide. If any unsafe conditions are present, you must determine how serious the apparent hazard could be and whether you can continue without first correcting the problem. Consider these conditions and the safety hazards they present: · Electrical hazards, especially primary power (primary voltage on the frame can cause serious or fatal electrical shock). · Explosive hazards, such as a damaged CRT face or bulging capacitor · Mechanical hazards, such as loose or missing hardware The guide consists of a series of steps presented in a checklist. Begin the checks with the power off, and the power cord disconnected. Checklist: 1. Check exterior covers for damage (loose, broken, or sharp edges). 2. Power-off the computer. Disconnect the power cord. 3. Check the power cord for: a. A third-wire ground connector in good condition. Use a meter to measure third-wire ground continuity for 0.1 ohm or less between the external ground pin and frame ground. b. The power cord should be the appropriate type as specified in the parts listings. c. Insulation must not be frayed or worn. 4. Remove the cover. 5. Check for any obvious alterations. Use good judgment as to the safety of any alterations. 6. Check inside the unit for any obvious unsafe conditions, such as metal filings, contamination, water or other liquids, or signs of fire or smoke damage. 7. Check for worn, frayed, or pinched cables. 8. Check that the power-supply cover fasteners (screws or rivets) have not been removed or tampered with. Chapter 1. Important safety information 3 Handling electrostatic discharge-sensitive devices Any computer part containing transistors or integrated circuits (ICs) should be considered sensitive to electrostatic discharge (ESD). ESD damage can occur when there is a difference in charge between objects. Protect against ESD damage by equalizing the charge so that the machine, the part, the work mat, and the person handling the part are all at the same charge. Notes: 1. Use product-specific ESD procedures when they exceed the requirements noted here. 2. Make sure that the ESD protective devices you use have been certified (ISO 9000) as fully effective. When handling ESD-sensitive parts: · Keep the parts in protective packages until they are inserted into the product. · Avoid contact with other people while handling the part. · Wear a grounded wrist strap against your skin to eliminate static on your body. · Prevent the part from touching your clothing. Most clothing is insulative and retains a charge even when you are wearing a wrist strap. · Use the black side of a grounded work mat to provide a static-free work surface. The mat is especially useful when handling ESD-sensitive devices. · Select a grounding system, such as those listed below, to provide protection that meets the specific service requirement. Note: The use of a grounding system is desirable but not required to protect against ESD damage. Attach the ESD ground clip to any frame ground, ground braid, or green-wire ground. Use an ESD common ground or reference point when working on a double-insulated or battery- operated system. You can use coax or connector-outside shells on these systems. Use the round ground-prong of the ac plug on ac-operated computers. Grounding requirements Electrical grounding of the computer is required for operator safety and correct system function. Proper grounding of the electrical outlet can be verified by a certified electrician. Safety notices (multi-lingual translations) The caution and danger safety notices in this section are provided in the following languages: · English · Arabic · Brazilian/Portuguese · Chinese (simplified) · Chinese (traditional) · French · German · Hebrew · Italian · Korean 4 M90a Pro Gen4 Hardware Maintenance Manual · Spanish DANGER Electrical current from power, telephone and communication cables is hazardous. To avoid a shock hazard: · Do not connect or disconnect any cables or perform installation, maintenance, or reconfiguration of this product during an electrical storm. · Connect all power cords to a properly wired and grounded electrical outlet. · Connect to properly wired outlets any equipment that will be attached to this product. · When possible, use one hand only to connect or disconnect signal cables. · Never turn on any equipment when there is evidence of fire, water, or structural damage. · Disconnect the attached power cords, telecommunications systems, networks, and modems before you open the device covers, unless instructed otherwise in the installation and configuration procedures. · Connect and disconnect cables as described in the following tables when installing, moving, or opening covers on this product or attached devices. To Connect 1. Turn everything OFF. 2. First, attach all cables to devices. 3. Attach signal cables to connectors. 4. Attach power cords to outlet. 5. Turn device ON. To Disconnect 1. Turn everything OFF. 2. First, remove power cords from outlet. 3. Remove signal cables from connectors. 4. Remove all cables from devices. CAUTION: When replacing the lithium battery, use only Part Number 45C1566 or an equivalent type battery recommended by the manufacturer. If your system has a module containing a lithium battery, replace it only with the same module type made by the same manufacturer. The battery contains lithium and can explode if not properly used, handled, or disposed of. Do not: · Throw or immerse into water · Heat to more than 100°C (212°F) · Repair or disassemble Dispose of the battery as required by local ordinances or regulations. CAUTION: Chapter 1. Important safety information 5 When laser products (such as CD-ROMs, DVD-ROM drives, fiber optic devices, or transmitters) are installed, note the following: · Do not remove the covers. Removing the covers of the laser product could result in exposure to hazardous laser radiation. There are no serviceable parts inside the device. · Use of controls or adjustments or performance of procedures other than those specified herein might result in hazardous radiation exposure. DANGER Some laser products contain an embedded Class 3A or Class 3B laser diode. Note the following: Laser radiation when open. Do not stare into the beam, do not view directly with optical instruments, and avoid direct exposure to the beam. 18 kg (37 lb) CAUTION: Use safe practices when lifting. 32 kg (70.5 lb) 55 kg (121.2 lb) CAUTION: The power control button on the device and the power switch on the power supply do not turn off the electrical current supplied to the device. The device also might have more than one power cord. To remove all electrical current from the device, ensure that all power cords are disconnected from the power source. 2 1 6 M90a Pro Gen4 Hardware Maintenance Manual Chapter 1. Important safety information 7 18 kg (37 lb) 32 kg (70.5 lb) 55 kg (121.2 lb) 2 1 8 M90a Pro Gen4 Hardware Maintenance Manual PERIGO A corrente elétrica proveniente de cabos de alimentação, de telefone e de comunicações é perigosa. Para evitar risco de choque elétrico: · Não conecte nem desconecte nenhum cabo ou execute instalação, manutenção ou reconfiguração deste produto durante uma tempestade com raios. · Conecte todos os cabos de alimentação a tomadas elétricas corretamente instaladas e aterradas. · Todo equipamento que for conectado a este produto deve ser conectado a tomadas corretamente instaladas. · Quando possível, utilize apenas uma das mãos para conectar ou desconectar cabos de sinal. · Nunca ligue nenhum equipamento quando houver evidência de fogo, água ou danos estruturais. · Antes de abrir tampas de dispositivos, desconecte cabos de alimentação, sistemas de telecomunicação, redes e modems conectados, a menos que especificado de maneira diferente nos procedimentos de instalação e configuração. · Conecte e desconecte os cabos conforme descrito na tabela apresentada a seguir ao instalar, mover ou abrir tampas deste produto ou de dispositivos conectados. Para Conectar: 1. DESLIGUE Tudo. 2. Primeiramente, conecte todos os cabos aos dispositivos. 3. Conecte os cabos de sinal aos conectores. 4. Conecte os cabos de alimentação às tomadas. 5. LIGUE os dispositivos. Para Desconectar: 1. DESLIGUE Tudo. 2. Primeiramente, remova os cabos de alimentação das tomadas. 3. Remova os cabos de sinal dos conectores. 4. Remova todos os cabos dos dispositivos. CUIDADO: Ao substituir a bateria de lítio, utilize apenas uma bateria com Número de Peça 45C1566 ou um tipo de bateria equivalente recomendado pelo Se o seu sistema possui um módulo com uma bateria de lítio, substitua-o apenas por um módulo do mesmo tipo e do mesmo fabricante. A bateria contém lítio e pode explodir se não for utilizada, manuseada ou descartada de maneira correta. Não: · Jogue ou coloque na água · Aqueça a mais de 100°C (212°F) · Conserte nem desmonte Descarte a bateria conforme requerido pelas leis ou regulamentos locais. Chapter 1. Important safety information 9 PRECAUCIÓN: Quando produtos a laser (como unidades de CD-ROMs, unidades de DVD-ROM, dispositivos de fibra ótica ou transmissores) estiverem instalados, observe o seguinte: · Não remova as tampas. A remoção das tampas de um produto a laser pode resultar em exposição prejudicial à radiação de laser. Não existem peças que podem ser consertadas no interior do dispositivo. · A utilização de controles ou ajustes ou a execução de procedimentos diferentes dos especificados aqui pode resultar em exposição prejudicial à radiação. PERIGO Alguns produtos a laser contêm diodo de laser integrado da Classe 3A ou da Classe 3B. Observe o seguinte: Radiação a laser quando aberto. Não olhe diretamente para o feixe a olho nu ou com instrumentos ópticos e evite exposição direta ao feixe. 18 kg (37 lb) 32 kg (70.5 lb) 55 kg (121.2 lb) CUIDADO: Utilize procedimentos de segurança para levantar equipamentos. CUIDADO: O botão de controle de alimentação do dispositivo e o botão para ligar/desligar da fonte de alimentação não desligam a corrente elétrica fornecida ao dispositivo. O dispositivo também pode ter mais de um cabo de alimentação. Para remover toda a corrente elétrica do dispositivo, assegure que todos os cabos de alimentação estejam desconectados da fonte de alimentação. 2 1 10 M90a Pro Gen4 Hardware Maintenance Manual Chapter 1. Important safety information 11 2 1 12 M90a Pro Gen4 Hardware Maintenance Manual Chapter 1. Important safety information 13 2 1 DANGER Le courant électrique provenant de l'alimentation, du téléphone et des câbles de transmission peut présenter un danger. Pour éviter tout risque de choc électrique : · Ne manipulez aucun câble et n'effectuez aucune opération d'installation, d'entretien ou de reconfiguration de ce produit au cours d'un orage. · Branchez tous les cordons d'alimentation sur un socle de prise de courant correctement câblé et mis à la terre. · Branchez sur des socles de prise de courant correctement câblés tout équipement connecté à ce produit. · Lorsque cela est possible, n'utilisez qu'une seule main pour connecter ou déconnecter les câbles d'interface. · Ne mettez jamais un équipement sous tension en cas d'incendie ou d'inondation, ou en présence de dommages matériels. · Avant de retirer les carters de l'unité, mettez celle-ci hors tension et déconnectez ses cordons d'alimentation, ainsi que les câbles qui la relient aux réseaux, aux systèmes de télécommunication et aux modems (sauf instruction contraire mentionnée dans les procédures d'installation et de configuration). · Lorsque vous installez, que vous déplacez, ou que vous manipulez le présent produit ou des périphériques qui lui sont raccordés, reportez-vous aux instructions ci-dessous pour connecter et déconnecter les différents cordons. 14 M90a Pro Gen4 Hardware Maintenance Manual Connexion Déconnexion 1. Mettez les unités HORS TENSION. 2. Commencez par brancher tous les cordons sur les unités. 3. Branchez les câbles d'interface sur des connecteurs. 4. Branchez les cordons d'alimentation sur des prises. 5. Mettez les unités SOUS TENSION. 1. Mettez les unités HORS TENSION. 2. Débranchez les cordons d'alimentation des prises. 3. Débranchez les câbles d'interface des connecteurs. 4. Débranchez tous les câbles des unités. ATTENTION: Remplacer la pile au lithium usagée par une pile de référence identique exclusivement, (référence 45C1566), ou suivre les instructions du fabricant qui en définit les équivalences. Si votre système est doté d'un module contenant une pile au lithium, vous devez le remplacer uniquement par un module identique, produit par le même fabricant. La pile contient du lithium et peut exploser en cas de mauvaise utilisation, de mauvaise manipulation ou de mise au rebut inappropriée. Ne pas : · la jeter à l'eau, · l'exposer à des températures supérieures à 100°C, · chercher à la réparer ou à la démonter. Ne pas mettre la pile à la poubelle. Pour la mise au rebut, se reporter à la réglementation en vigueur. ATTENTION: Si des produits à laser (tels que des unités de CD-ROM, de DVD-ROM, des unités à fibres optiques, ou des émetteurs) sont installés, prenez connaissance des informations suivantes : · Ne retirez pas le carter. En ouvrant l'unité de CD-ROM ou de DVD-ROM, vous vous exposez au rayonnement dangereux du laser. Aucune pièce de l'unité n'est réparable. · Pour éviter tout risque d'exposition au rayon laser, respectez les consignes de réglage et d'utilisation des commandes, ainsi que les procédures décrites dans le présent manuel. DANGER Certains produits à laser contiennent une diode à laser intégrée de classe 3A ou 3B. Prenez connaissance des informations suivantes: Rayonnement laser lorsque le carter est ouvert. Evitez toute expositiondirecte au rayon laser. Evitez de regarder fixement le faisceau ou del'observer à l'aide d'instruments optiques. Chapter 1. Important safety information 15 18 kg (37 lb) 32 kg (70.5 lb) 55 kg (121.2 lb) ATTENTION: Soulevez la machine avec précaution. ATTENTION: L'interrupteur de contrôle d'alimentation de l'unité et l'interrupteur dubloc d'alimentation ne coupent pas le courant électrique alimentantl'unité. En outre, le système peut être équipé de plusieurs cordonsd'alimentation. Pour mettre l'unité hors tension, vous devez déconnectertous les cordons de la source d'alimentation. 2 1 VORSICHT An Netz-, Telefon- und Datenleitungen können gefährliche Spannungen anliegen. Aus Sicherheitsgründen: · Bei Gewitter an diesem Gerät keine Kabel anschließen oder lösen. Ferner keine Installations-, Wartungs- oder Rekonfigurationsarbeiten durchführen. · Gerät nur an eine Schutzkontaktsteckdose mit ordnungsgemäß geerdetem Schutzkontakt anschließen. · Alle angeschlossenen Geräte ebenfalls an Schutzkontaktsteckdosen mit ordnungsgemäß geerdetem Schutzkontakt anschließen. · Die Signalkabel nach Möglichkeit einhändig anschließen oder lösen, um einen Stromschlag durch Berühren von Oberflächen mit unterschiedlichem elektrischem Potenzial zu vermeiden. 16 M90a Pro Gen4 Hardware Maintenance Manual · Geräte niemals einschalten, wenn Hinweise auf Feuer, Wasser oder Gebäudeschäden vorliegen. · Die Verbindung zu den angeschlossenen Netzkabeln, Telekommunikationssystemen, Netzwerken und Modems ist vor dem Öffnen des Gehäuses zu unterbrechen, sofern in den Installations- und Konfigurationsprozeduren keine anders lautenden Anweisungen enthalten sind. · Zum Installieren, Transportieren und Öffnen der Abdeckungen des Computers oder der angeschlossenen Einheiten die Kabel gemäß der folgenden Tabelle anschließen und abziehen. Zum Anschließen der Kabel gehen Sie wie folgt vor 1. Schalten Sie alle Einheiten AUS. 2. Schließen Sie erst alle Kabel an die Einheiten an. 3. Schließen Sie die Signalkabel an die Buchsen an. 4. Schließen Sie die Netzkabel an die Steckdose an. 5. Schalten Sie die Einheit EIN. Zum Abziehen der Kabel gehen Sie wie folgt vor 1. Schalten Sie alle Einheiten AUS. 2. Ziehen Sie zuerst alle Netzkabel aus den Netzsteckdosen. 3. Ziehen Sie die Signalkabel aus den Buchsen. 4. Ziehen Sie alle Kabel von den Einheiten ab. CAUTION: Eine verbrauchte Lithiumbatterie nur durch eine Batterie mit der Teilenummer 45C1566 oder eine gleichwertige, vom Hersteller empfohlene Batterie ersetzen. Enthält das System ein Modul mit einer Lithiumbatterie, dieses nur durch ein Modul desselben Typs und von demselben Hersteller ersetzen. Die Batterie enthält Lithium und kann bei unsachgemäßer Verwendung, Handhabung oder Entsorgung explodieren. Die Batterie nicht: · mit Wasser in Berührung bringen. · über 100 C erhitzen. · reparieren oder zerlegen. Die örtlichen Bestimmungen für die Entsorgung von Sondermüll beachten. ACHTUNG: Bei der Installation von Lasergeräten (wie CD-ROM-Laufwerken, DVD- aufwerken, Einheiten mit Lichtwellenleitertechnik oder Sendern) Folgendes beachten: · Die Abdeckungen nicht entfernen. Durch Entfernen der Abdeckungen des Lasergeräts können gefährliche Laserstrahlungen freigesetzt werden. Das Gerät enthält keine zu wartenden Teile. · Werden Steuerelemente, Einstellungen oder Durchführungen von Prozeduren anders als hier angegeben verwendet, kann gefährliche Laserstrahlung auftreten. VORSICHT Chapter 1. Important safety information 17 Einige Lasergeräte enthalten eine Laserdiode der Klasse 3A oder 3B. Beachten Sie Folgendes: Laserstrahlung bei geöffneter Verkleidung. Nicht in den Strahl blicken. Keine Lupen oder Spiegel verwenden. Strahlungsbereich meiden. 18 kg 32 kg 55 kg ACHTUNG: Arbeitsschutzrichtlinien beim Anheben der Maschine beachten. ACHTUNG: Mit dem Netzschalter an der Einheit und am Netzteil wird die Stromversorgung für die Einheit nicht unterbrochen. Die Einheit kann auch mit mehreren Netzkabeln ausgestattet sein. Um die Stromversorgung für die Einheit vollständig zu unterbrechen, müssen alle zum Gerät führenden Netzkabel vom Netz getrennt werden. 2 1 18 M90a Pro Gen4 Hardware Maintenance Manual Chapter 1. Important safety information 19 2 1 PERICOLO La corrente elettrica proveniente dai cavi di alimentazione, del telefono e di comunicazione può essere pericolosa. 20 M90a Pro Gen4 Hardware Maintenance Manual Per evitare il rischio di scosse elettriche: · Non collegare o scollegare qualsiasi cavo oppure effettuare l'installazione, la manutenzione o la riconfigurazione del prodotto durante un temporale. · Collegare tutti i fili elettrici a una presa di alimentazione correttamente cablata e dotata di messa a terra. · Collegare alle prese elettriche appropriate tutte le apparecchiature che verranno utilizzate per questo prodotto. · Se possibile, utilizzare solo una mano per collegare o scollegare i cavi di segnale. · Non accendere assolutamente apparecchiature in presenza di incendi, perdite d'acqua o danno strutturale. · Scollegare i cavi di alimentazione, i sistemi di telecomunicazione, le reti e il modem prima di aprire i coperchi del dispositivo, salvo istruzioni contrarie relative alle procedure di installazione e configurazione. · Collegare e scollegare i cavi come descritto nella seguente tabella quando vengono effettuate operazioni di installazione, spostamento o apertura dei coperchi di questo prodotto o delle unità collegate. Per collegarsi 1. SPEGNERE le apparecchiature. 2. Innanzitutto, collegare tutti i cavi alle unità. 3. Collegare i cavi di segnale ai connettori. 4. Collegare i cavi di alimentazione alla presa. 5. Accendere l'unità. Per scollegarsi 1. SPEGNERE le apparecchiature. 2. Innanzitutto, rimuovere i cavi di alimentazione dalla presa. 3. Rimuovere i cavi di segnale dai connettori. 4. Rimuovere tutti i cavi dalle unità. ATTENZIONE: Quando si sostituisce la batteria al litio, utilizzare solo il Numero parte 45C1566 o un tipo di batteria equivalente consigliato dal produttore. Se sul sistema è presente un modulo che contiene una batteria al litio, sostituirlo solo con un tipo di modulo dello stesso tipo della stessa casa di produzione. La batteria contiene litio e può esplodere se usata, maneggiata o smaltita in modo non corretto. Non: · Gettare o immergere la batteria nell'acqua · Riscaldarla ad una temperatura superiore ai 100 gradi C (212 gradi F) · Smontarla, ricaricarla o tentare di ripararla Le batterie usate vanno smaltite in accordo alla normativa in vigore (DPR 915/82 e successive disposizioni e disposizioni locali). ATTENZIONE: Chapter 1. Important safety information 21 Quando vengono installati prodotti laser (quali CD-ROM, unità DVD-ROM, unità a fibre ottiche o trasmittenti), tener presente quanto segue: · Non rimuovere gli sportelli. L'apertura di un'unità laser può determinare l'esposizione a radiazioni laser pericolose. All'interno dell'unità non vi sono parti su cui effettuare l'assistenza tecnica. · L'utilizzo di controlli, regolazioni o l'esecuzione di procedure non descritti nel presente manuale possono provocare l'esposizione a radiazioni pericolose. PERICOLO Alcune unità laser contengono un diodo laser di Classe 3A o Classe 3B. Tener presente quanto segue: Aprendo l'unità vengono emesse radiazioni laser. Non fissare il fascio, non guardarlo direttamente con strumenti ottici ed evitare l'esposizione al fascio. 18 kg 32 kg ATTENZIONE: Prestare attenzione nel sollevare l'apparecchiatura. 55 kg ATTENZIONE: Il pulsante di controllo dell'alimentazione presente sull'unità e l'interruttore dell'alimentatore non disattivano l'alimentazione corrente fornita all'unità. E' possibile che l'unità disponga di più cavi di alimentazione. Per disattivare l'alimentazione dall'unità, accertarsi che tutti i cavi di alimentazione siano scollegati dalla fonte di alimentazione. 2 1 22 M90a Pro Gen4 Hardware Maintenance Manual Chapter 1. Important safety information 23 2 1 PELIGRO La corriente eléctrica procedente de cables de alimentación, teléfonos y cables de comunicación puede ser peligrosa. Para evitar el riesgo de descarga eléctrica: · No conecte ni desconecte los cables ni realice ninguna tarea de instalación, mantenimiento o reconfiguración de este producto durante una tormenta eléctrica. · Conecte todos los cables de alimentación a tomas de corriente debidamente cableadas y conectadas a tierra. 24 M90a Pro Gen4 Hardware Maintenance Manual · Cualquier equipo que se conecte a este producto también debe conectarse a tomas de corriente debidamente cableadas. · Siempre que sea posible, utilice una sola mano para conectar o desconectar los cables de señal. · No encienda nunca un equipo cuando hay señales de fuego, agua o daños estructurales. · Desconecte los cables de alimentación, los sistemas de telecomunicaciones, las redes y los módems conectados antes de abrir las cubiertas de los dispositivos, a menos que se indique lo contrario en los procedimientos de instalación y configuración. · Conecte y desconecte los cables, como se describe en la tabla siguiente, cuando instale, mueva o abra las cubiertas de este producto o de los dispositivos conectados. Para conectar 1. APÁGUELO todo. 2. En primer lugar, conecte todos los cables a los dispositivos. 3. Conecte los cables de señal a los conectores. 4. Enchufe los cables de alimentación a las tomas de corriente. 5. Encienda el dispositivo. Para desconectar 1. APÁGUELO todo. 2. En primer lugar, desenchufe los cables de alimentación de las tomas de corriente. 3. Desconecte los cables de señal de los conectores. 4. Desconecte todos los cables de los dispositivos. PRECAUCIÓN: Cuando sustituya una batería de litio, utilice solamente una batería número de pieza 45C1566 u otra de tipo equivalente recomendada por el fabricante. Si su sistema dispone de un módulo que contiene una batería de litio, reemplácelo sólo con el mismo tipo de módulo, del mismo fabricante. La batería contiene litio y puede explotar si no se utiliza, manipula o desecha correctamente. No debe: · Arrojarla al agua o sumergirla en ella · Exponerla a temperaturas superiores a 100°C (212°F) · Repararla o desmontarla Deshágase de la batería según especifiquen las leyes o normas locales. PRECAUCIÓN: Cuando haya productos láser (como unidades de CD-ROM, unidades de DVD, dispositivos de fibra óptica o transmisores) instalados, tenga en cuenta lo siguiente: · No quite las cubiertas. Si quita las cubiertas del producto láser, podría quedar expuesto a radiación láser peligrosa. Dentro del dispositivo no existe ninguna pieza que requiera servicio técnico. · Si usa controles o ajustes o realiza procedimientos que no sean los especificados aquí, podría exponerse a radiaciones peligrosas. Chapter 1. Important safety information 25 PELIGRO Algunos productos láser tienen incorporado un diodo láser de clase 3A o clase 3B. Tenga en cuenta lo siguiente: Cuando se abre, queda expuesto a radiación láser. No mire directamente al rayo láser, ni siquiera con instrumentos ópticos, y evite exponerse directamente al rayo láser. 18 kg 32 kg PRECAUCIÓN: Adopte procedimientos seguros al levantar el equipo. 55 kg PRECAUCIÓN: El botón de control de alimentación del dispositivo y el interruptor de alimentación de la fuente de alimentación no desconectan la corriente eléctrica suministrada al dispositivo. Además, el dispositivo podría tener más de un cable de alimentación. Para suprimir toda la corriente eléctrica del dispositivo, asegúrese de que todos los cables de alimentación estén desconectados de la toma de corriente. 2 1 26 M90a Pro Gen4 Hardware Maintenance Manual Chapter 2. Important service information Strategy for replacing FRUs Before replacing parts: Ensure that all software fixes, drivers, and UEFI BIOS downloads are installed before you replace any FRUs listed in this manual. After a system board is replaced, ensure that the latest UEFI BIOS is loaded to the system board before you complete the service action. To download and install software fixes, drivers, and UEFI BIOS, go to https://pcsupport.lenovo.com and follow the instructions on the screen. Use the following strategy to prevent unnecessary expense for replacing and servicing FRUs: · If you are instructed to replace a FRU but the replacement does not correct the problem, reinstall the original FRU before you continue. · Some computers have both a processor board and a system board. If you are instructed to replace either the processor board or the system board, and replacing one of them does not correct the problem, reinstall that board, and then replace the other one. · If an adapter or a device consists of more than one FRU, any of the FRUs might be the cause of the error. Before replacing the adapter or device, remove the FRUs, one by one, to see if the symptoms change. Replace only the FRU that changed the symptoms. Strategy for replacing a hard disk drive or a solid-state drive Always try to run a low-level format operation before replacing a hard disk drive or a solid-state drive. This will cause all customer data on the drive to be lost. Ensure that the customer has a current backup of the data before you perform this task. Attention: The drive startup sequence in the computer you are servicing might have been changed. Be extremely careful during write operations such as copying, saving, or formatting. If you select an incorrect drive, data or programs can be overwritten. Important notice for replacing a system board Some components mounted on a system board are very sensitive. Improper handling of a system board can cause damage to those components, and may cause a system malfunction. After replacing the system board, use the Golden Key U1 tool to bind the model type, serial number, and Brand ID of the computer with the new system board. Refer to https://support.lenovo.com/us/en/solutions/ ht102004 for instructions. Attention: When handling a system board: · Do not drop a system board or apply any excessive force to it. · Avoid rough handling of any kind. · Avoid bending a system board and hard pushing to prevent cracking at each Ball Grid Array (BGA) chipset. © Copyright Lenovo 2023, 2025 27 How to use error codes Use the error codes displayed on the screen to diagnose failures. If more than one error code is displayed, begin the diagnosis with the first error code. Whatever causes the first error code might also cause false error codes. If no error code is displayed, see whether the error symptom is listed in the "Symptom-to-FRU Index" section. Strategy for replacing FRUs for CTO, special-bid, and standard models This topic provides information about the model types and FRU identification. Product definition This topic introduces different model types and how to identify each type. Dynamic Configure To Order (CTO) model This model provides the ability for a customer to configure a Lenovo solution from a Web site, and have this configuration sent to fulfillment, where it is built and shipped directly to the customer. The machine label and eSupport will load these products as the 4-character MT, 4-character model, and 2-character country code. The model is "CTO1" and the default country code is "WW" (example: 20AACTO1WW). Special-bid model This model is a unique configuration that has been negotiated between Lenovo and the customer. A unique MTM consists of a 4-character MT, a 4-character model, and a numeric 2-character country code is provided to the customer to place orders (example: 20AA000955). The country code assigned is numeric and does not designate a specific country or region. The custom model factsheet for the MTM indicates which country the special-bid MTM is set up for. Special-bid offering is not generally announced. Standard model Standard models (fixed configuration) are announced and offered to all customers. The MTM portion of the machine label consists of a 4-character MT, a 4-character model, and an alphabetic 2-character country code. The country code assigned is alphabetic and represents a designated country or region (example: 20AA0009UK). FRU identification To identify FRUs for a product, do the following: 1. Go to: https://support.lenovo.com/partslookup. 2. Type the Machine Type in the corresponding field to get a general FRU list, or type the Serial Number for more detailed FRU information. 28 M90a Pro Gen4 Hardware Maintenance Manual Chapter 3. Product overview Front 1. Microphones* 3. Integrated camera or Infrared (IR) camera* 5. IR camera activity indicator* 7. System status indicator 9. Microphone mute/unmute control © Copyright Lenovo 2023, 2025 2. Radar card* 4. Integrated camera or Infrared (IR) camera shield* 6. Screen 8. Microphone mute/unmute indicator* 10. ThunderboltTM 4 connector 29 11. USB 3.2 connectors Gen 2 13. Headset connector 15. Power button 17. Optical drive eject button* 12. Thunderbolt 3 connector* 14. SD-card slot* 16. Optical drive activity indicator* * for selected models System status indicator Show the system status of your computer. Thunderbolt 3 connector For the use of this connector, see "Thunderbolt 3 connector" on User Guide. · Blinking for three times: The computer is initially connected to power. · On: The computer is starting up or working. · Off: The computer is off or in hibernation mode. · Blinking rapidly: The computer is entering sleep or hibernation mode. · Blinking slowly: The computer is in sleep mode. 30 M90a Pro Gen4 Hardware Maintenance Manual Rear 1. DisplayPortTM out connector 3. Ethernet connector 5. USB 3.2 connectors Gen 1 7. OSD joystick 9. Power cord connector * for selected models 2. HDMITM in 1.4/Out 2.1 TMDS combo connector 4. USB-C® (3.2 Gen 2) connector 6. USB 3.2 connector Gen 1 (with smart power-on feature) 8. Security-lock slot 10. VESA® threaded holes (screws: M4 x 8 mm, 4 pcs) Chapter 3. Product overview 31 32 M90a Pro Gen4 Hardware Maintenance Manual Chapter 4. Service checkout and symptom-to-FRU index This chapter provides information about general service checkout and symptom-to-FRU index. Service checkout Attention: The drives in the computer you are servicing might have been rearranged or the drive startup sequence changed. Be extremely careful during write operations such as copying, saving, or formatting. Data or programs can be overwritten if you select an incorrect drive. General error messages appear if a problem or conflict is found by a program, the operating system, or both. For an explanation of these messages, refer to the information supplied with that software package. Use the following procedure to help determine the cause of the problem: 1. Turn off the computer and all external devices. 2. Check all cables and power cords. 3. Set all display controls to the middle position. 4. Turn on all external devices. 5. Turn on the computer. · Look for displayed error codes. · Listen for beep codes. · Look for readable instructions or a main menu on the display. If you did not receive the correct response, proceed to step 6 on page 33. If you do receive the correct response, proceed to step 7 on page 33. 6. Look at the following conditions and follow the instructions: · If you hear beep codes during POST, go to "Beep symptoms" on page 35. · If the computer displays a POST error, go to "POST error codes" on page 36. · If the computer hangs and no error is displayed, continue at step 7 on page 33. 7. Run the Diagnostic programs. See Chapter 5 "Diagnostics" on page 41. · If you receive an error, replace the part that the diagnostic program calls out. · If the test stops and you cannot continue, replace the last device tested. Problem determination tips Due to the variety of hardware and software combinations that can be encountered, use the following information to assist you in problem determination. If possible, have this information available when requesting assistance from Service Support and Engineering functions. · Machine type and model · Processor or hard disk drive upgrades · Failure symptom Do diagnostics indicate a failure? What, when, where, single, or multiple systems? Is the failure repeatable? Has this configuration ever worked? © Copyright Lenovo 2023, 2025 33 If it has been working, what changes were made prior to its failing? Is this the original reported failure? · Diagnostics version Type and version level · Hardware configuration Print (print screen) configuration currently in use BIOS level · Operating system software Type and version level Notes: To eliminate confusion, identical systems are considered identical only if they: 1. Are the exact machine type and models 2. Have the same BIOS level 3. Have the same adapters/attachments in the same locations 4. Have the same address jumpers/terminators/cabling 5. Have the same software versions and levels 6. Have the same Diagnostic Diskettes (version) 7. Have the same configuration options set in the system 8. Have the same setup for the operating system control files Comparing the configuration and software set-up between "working and non-working" systems will often lead to problem resolution. Symptom-to-FRU index The Symptom-to-FRU index lists error symptoms and possible causes. The most likely cause is listed first. Always begin with "Service checkout" on page 33. This index can also be used to help you decide which FRUs to have available when servicing a computer. If you are unable to correct the problem using this index, go to "Undetermined problems" on page 39. Notes: · The Symptom-to-FRU index is not specific to any machine type and are applicable to all computers. · If you have both an error message and an incorrect audio response, diagnose the error message first. · If you cannot run the diagnostic tests or you get a diagnostic error code when running a test, but did receive a POST error message, diagnose the POST error message first. · If you did not receive any error message, look for a description of your error symptoms in the first part of this index. Hard disk drive boot error A hard disk drive boot error can have the following causes. Error The start-up drive is not in the boot sequence in configuration. No operating system installed on the boot drive. FRU/Action Check the configuration and ensure that the start-up drive is in the boot sequence. Install an operating system on the boot drive. 34 M90a Pro Gen4 Hardware Maintenance Manual Error The boot sector on the startup drive is corrupted. The drive is defective. FRU/Action The drive must be formatted. Do the following: 1. Attempt to back up the data on the failing hard disk drive. 2. Using the operating system programs, format the hard disk drive. Replace the hard disk drive. Power supply problems If you suspect a power problem, use the following procedures. Check/Verify Check the following for proper installation. · Power cord · On/Off switch connector · On/Off switch power supply connector · System board power supply connectors · CPU connection Check the power cord for continuity. Check the power-on switch for continuity. FRU/Action Reseat connectors Power cord Power-on switch Beep symptoms Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during POST. The following table describes the beep symptoms. Beep symptom 2 short beeps: common POST error 3 short and 1 long beeps: DRAM memory error 4 long beeps: insufficient shadow RAM resources for option ROM (error code: 8998) or PCIe/PCI MMIO (memory mappedinput/output) resources (error code: 8999) 2 long and 3 short beeps: graphics card error FRU/Action Common POST error code. See the detailed failure information in "POST error codes" on page 36. Perform the following actions in order: 1. Make sure that the memory modules are properly seated in the memory slots. 2. Replace the memory modules. 3. Replace the system board. See the detailed failure information in "POST error codes" on page 36. Perform the following actions in order: 1. Make sure that the graphics cards are properly seated in the slots. 2. Replace the graphics cards. 3. Replace the system board. Chapter 4. Service checkout and symptom-to-FRU index 35 POST error codes Each time you turn on the system, it performs a series of tests that check the operation of the system and some options. This series of tests are called the Power-On Self-Test, or POST. POST checks the following operations: · Some basic system-board operations · Memory operation · Video operation · Whether the boot drive is working If the POST detects a problem, an error message appears on the screen. A single problem might cause several error messages to appear. When you correct the cause of the first error message, the other error messages probably will not appear on the screen the next time. Error code 0135 0162 0164 1762 POST error message CPU fan failure System fan failure Power fan failure Front fan failure Rear fan failure Auxiliary fan failure ODD fan failure Setup data integrity check failure Memory configuration change has occurred Storage device configuration change has occurred Description/Action This error message is displayed when a fan fails and the system might be overheating. Press F10 to exit. This error indicates the checksum of BIOS Setup data in NVRAM is bad. In BIOS Setup, the "Save Changes and Exit" operation is needed in order to clear this error. This error message is displayed when the memory size is changed. Press F10 to exit. This error message is displayed when a hard disk drive change or an optical drive change has been made. Press F10 to exit. 36 M90a Pro Gen4 Hardware Maintenance Manual Error code 8998 8999 POST error message Not enough shadow RAM resources for OPTION ROM, not all devices initialized. Suggest to remove some add-on cards, or change to UEFI mode in BIOS setup. Not enough PCIe/PCI MMIO resources. Currently only one video card is enabled. Remove some PCIe cards. Description/Action This error message is displayed when the shadow RAM resources for option ROM are insufficient. If the legacy option ROM is insufficient, remove some add-in cards. For the system that supports UEFI, set UEFI as the first priority. This error message is displayed when the PCIe/PCI MMIO (memory mapped input/output) resources are insufficient. Remove some add-in cards. Miscellaneous error conditions Message/Symptom Changing display colors FRU/Action Display/Monitor Computer will not power-off. See "Hard disk drive boot error" on page 34. Computer will not RPL from server 1. Power Switch 2. System Board 3. Riser card, if installed. 1. Ensure that the network is in startup sequence as the first device or the first device after diskette. 2. Ensure that the network adapter is enabled for RPL. 3. Network adapter (Advise network administrator of new MAC address) Computer will not perform a Wake On LAN® (if applicable) 1. Check the power supply and signal cable connections to the network adapter. 2. Ensure that the operating system settings are set to enable Wake on LAN. 3. Ensure that the Wake On LAN feature is enabled in Setup/Configuration. 4. Ensure that the network administrator is using the correct MAC address. 5. Ensure no interrupt or I/O address conflicts. 6. Network adapter (advise network administrator of new MAC address) Dead computer. See "Hard disk drive boot error" on page 34. 1. Power Supply 2. System Board Diskette drive in-use light remains on or does not light when drive is active. 1. Diskette Drive 2. System Board 3. Diskette Drive Cable Chapter 4. Service checkout and symptom-to-FRU index 37 Message/Symptom FRU/Action Blank screen except for flashing cursor. 1. System Board 2. Primary Hard Disk Drive 3. Hard Disk Drive Cable Incorrect memory size during POST 1. Run the Memory tests. 2. Memory Module 3. System Board "Insert a Diskette" icon appears with a known-good diagnostics diskette in the first 3.5-inch diskette drive. 1. System Board 2. Diskette Drive Cable 3. Network Adapter Intensity or color varies from left to right of characters and color bars 1. Display 2. Video adapter (if present) 3. System Board No power or fan not running 1. See "Hard disk drive boot error" on page 34. Non-system disk or disk error-type message with a known-good diagnostic diskette. 1. Diskette Drive 2. System Board 3. Diskette Drive Cable Other display symptoms not listed above (including blank or illegible display) 1. Display 2. System Board Power-on indicator or hard disk drive in-use light not on, but computer works correctly 1. Power switch/LED assembly 2. System Board Printer problems 1. Printer 2. System Board Program loads from the hard disk with a known-good diagnostics diskette in the first 3.5-inch diskette drive 1. Run the Setup Utility program and check the Startup sequence. 2. Diskette Drive 3. Diskette Drive Cable 4. System Board 5. Power Supply RPL computer cannot access programs from its own hard disk. 1. If the network administrator is using LCCM Hybrid RPL, check the startup sequence: a. First device - network b. Second device - hard disk 2. Hard disk drive RPL computer does not RPL from server 1. Check the startup sequence. 2. Check the network adapter LED status. 38 M90a Pro Gen4 Hardware Maintenance Manual Message/Symptom Serial or parallel connector device failure (system board connector) Serial or parallel connector device failure (adapter connector) Some or all keys on the keyboard do not work FRU/Action 1. External Device Self-Test OK? 2. External Device 3. Cable 4. System Board 1. External Device Self-Test OK? 2. External Device 3. Cable 4. Alternate Adapter 5. System Board 1. Keyboard 2. Keyboard Cable 3. System Board Undetermined problems This section provides instructions on how to find out the failing devices or adapters. 1. Turn off the computer. 2. Remove or disconnect the following components (if installed) one at a time. a. External devices (modem, printer, or mouse) b. Any adapters c. Memory modules d. Extended video memory e. External Cache f. External Cache RAM g. Hard disk drive h. Diskette drive 3. Turn on the computer to retest the system. 4. Repeat steps 1 through 3 until you find the failing device or adapter. If all devices and adapters have been removed, and the problem continues, replace the system board. See Chapter 6 "Hardware removal and installation" on page 45. Recover from a BIOS update failure 1. Remove all media from the drives and turn off all connected devices. 2. Insert the BIOS update disc into the optical drive, and then turn off the computer. 3. Disconnect all power cords from electrical outlets. Then, remove any parts that impede access to the Clear CMOS jumper. 4. Move the jumper from the standard position to the maintenance position. 5. Reconnect the power cords for the computer and the monitor to electrical outlets. 6. Turn on the computer and the monitor. When the computer beeps, the recovery process begins. 7. After the recovery process is completed, the computer will be turned off automatically. Chapter 4. Service checkout and symptom-to-FRU index 39 Note: Depending on the computer model, the recovery process will take two to three minutes. 8. Disconnect all power cords from electrical outlets. 9. Move the jumper back to the standard position. 10. Reinstall all the parts that have been removed. Then, reconnect the power cords for the computer and the monitor to electrical outlets. 11. Turn on the computer and the monitor. When the logo screen is displayed, press F1 or Fn+F1. 12. To prevent data loss, ensure that BIOS settings are restored to an earlier point. Clear CMOS 1. Remove all media from the drives and turn off all connected devices and the computer. 2. Disconnect all power cords from electrical outlets. Then, remove any parts that impede access to the Clear CMOS jumper. 3. Move the jumper from the standard position to the maintenance position. 4. Reconnect the power cords for the computer and the monitor to electrical outlets. 5. Turn on the computer and the monitor. When the computer beeps, wait for approximately 10 seconds. 6. Turn off the computer by holding the power button for approximately four seconds. 7. Disconnect all power cords from electrical outlets. 8. Move the jumper back to the standard position. 9. Reinstall all the parts that have been removed. Then, reconnect the power cords for the computer and the monitor to electrical outlets. 10. Turn on the computer and the monitor. When the logo screen is displayed, press F1 or Fn+F1. 11. To prevent data loss, ensure that BIOS settings are restored to an earlier point. 40 M90a Pro Gen4 Hardware Maintenance Manual Chapter 5. Diagnostics Use diagnostic solutions to test hardware components and report operating-system-controlled settings that interfere with the correct operation of your computer. Basic procedure for resolving computer problems Prerequisite Before you start, read Chapter 1 "Important safety information" on page 1 and print the following instructions. 1. Check that: a. The cables for all connected devices are connected correctly and securely. b. All components have been reassembled correctly. c. All connected devices that require ac power are connected to properly grounded and working electrical outlets. d. All connected devices are enabled in UEFI BIOS. 2. Use an antivirus program to see if the computer has been infected by a virus. If the program detects a virus, remove the virus. 3. Go to "Self-help resources" on page 42 and follow the instructions for the type of problem you are experiencing. 4. Run the diagnostic program. 5. Recover your operating system. See "Self-help resources" on page 42. 6. If the problem persists, contact Lenovo. UEFI diagnostic program A UEFI diagnostic program is preinstalled on the computer. It enables you to test memory modules and internal storage devices, view system information, and check and recover bad sectors on internal storage devices. To run the UEFI diagnostic program, do the following: 1. Turn on the computer. If the computer cannot be turned on, go to "Basic procedure for resolving computer problems" on page 41. If an error code is displayed, go to "Symptom-to-FRU index" on page 34 for error code descriptions and troubleshooting hints. 2. Repeatedly press and release the F10 key when turning on the computer. The main screen of the UEFI diagnostic program is displayed. 3. Follow the instructions on the screen to use the diagnostic program. The options on the main screen are as follows: © Copyright Lenovo 2023, 2025 41 Table 1. Options on the main screen of the UEFI diagnostic program DIAGNOSTICS TOOLS · CPU [U] · DISPLAY [D] · MEMORY [E] · MOTHERBOARD [H] · PCI EXPRESS [P] · STORAGE [S] · AUDIO [Z] · OPTICAL [O] · RUN ALL [R] · SYSTEM INFORMATION [F1] · BAD BLOCK RECOVERY [F3] · SMART INFORMATION [F5] Note: The options on the main screen might vary, depending on the hardware configuration and the UEFI diagnostic program version preinstalled on the computer. Lenovo diagnostic tools For information about Lenovo diagnostic tools, go to: https://pcsupport.lenovo.com/lenovodiagnosticsolutions Use the Vantage app The Vantage app is preinstalled on your computer. To diagnose problems with the Vantage app: 1. Type Vantage in the Windows search box and press Enter. 2. Follow the on-screen instructions and run a hardware scan. If you are unable to isolate and resolve the problem after running the Vantage app, save and print the log files created by the program. You might need the log files when you speak to a Lenovo technical support representative. Self-help resources Use the following self-help resources to learn more about the computer and troubleshoot problems. Resources Troubleshooting and frequently asked questions Accessibility information How to access? · https://www.lenovo.com/tips · https://forums.lenovo.com https://www.lenovo.com/accessibility 42 M90a Pro Gen4 Hardware Maintenance Manual Resources How to access? Reset or restore Windows Use the Vantage app to: · Configure device settings. · Download and install UEFI BIOS, drivers and firmware updates. · Secure you computer from outside threats. · Diagnose hardware problems. · Check the computer warranty status. · Access User Guide and helpful articles. Note: The available features vary depending on the computer model. Product documentation: · Safety and Warranty Guide · Generic Safety and Compliance Notices · Setup Guide · This User Guide · Regulatory Notice Lenovo Support Web site with the latest support information of the following: · Drivers and software · Diagnostic solutions · Product and service warranty · Product and parts details · Knowledge base and frequently asked questions · Use Lenovo recovery options. 1. Go to https://support.lenovo.com/ HowToCreateLenovoRecovery. 2. Follow the on-screen instructions. · Use Windows recovery options. 1. Go to https://pcsupport.lenovo.com. 2. Detect your computer or manually select your computer model. 3. Navigate to the troubleshooting menu to diagnose the operating system for recovery instructions. Type Vantage in the Windows search box. Go to https://pcsupport.lenovo.com. Then, follow the onscreen instructions to filter out the documentation you want. https://pcsupport.lenovo.com Windows help information · Type Get Help or Tips in the Windows search box. · Use Windows Search. · Microsoft support Web site: https://support.microsoft.com Chapter 5. Diagnostics 43 44 M90a Pro Gen4 Hardware Maintenance Manual Chapter 6. Hardware removal and installation This chapter provides instructions on how to remove and install hardware for your computer. Handling static-sensitive devices Do not open the static-protective package containing the new part until the defective part has been removed and you are ready to install the new part. Static electricity, although harmless to you, can seriously damage computer components and options. When you handle options and other computer components, take these precautions to avoid static-electricity damage: · Limit your movement. Movement can cause static electricity to build up around you. · Always handle options and other computer components carefully. Handle PCI/PCIe cards, memory modules, system boards, and CPUs by the edges. Never touch any exposed circuitry. · Prevent others from touching the options and other computer components. · Touch the static-protective package containing the part to a metal expansion-slot cover or other unpainted metal surface on the computer for at least two seconds. This reduces static electricity from the package and your body before you install or replace a new part. · When possible, remove the new part from the static-protective package, and install it directly in the computer without setting the part down. When this is not possible, place the static-protective package on a smooth, level surface and place the part on the package. · Do not place the part on the computer cover or other metal surface. Service tool kit Ensure that the following common service tool kit is prepared before you service the computer. No. Tool name Specification Product scope Tool type 1 Screwdriver: Phillips Head 0 PH0 All Common tool 2 Screwdriver: Phillips Head 00 PH00 All Common tool 3 Screwdriver: Phillips Head 01 1 All Common tool 4 Screwdriver: Phillips Head 01 1, Shank length greater than 6 ThinkStation/DT Common tool inches 5 Screwdriver: Phillips Head 02 2, Shank length greater than 6 ThinkStation/SC/DT Common tool inches 6 Screwdriver: Torx Head T5 T5 IdeaPad Common tool © Copyright Lenovo 2023, 2025 45 No. Tool name Specification Product scope Tool type 7 Screwdriver: Torx Head T15 T15, for Chassis outside ThinkStation Common tool 8 Screwdriver: Torx Head T20 T20, Shank length greater than ThinkStation 6 inches, for heatsink and CPU 9 Screwdriver: Torx Head T30 T30, Shank length greater than ThinkStation 6 inches, for heatsink and CPU 10 Pry tools 1 N/A All Common tool Common tool Common tool 11 Tweezers (conductive) N/A All Common tool 12 Tweezers (isolated) N/A All Common tool 13 Suction cup N/A All Common tool 14 Hexagonal socket (for VGA ) H5 mm or 4.8 mm ThinkCentre/Tiny Common tool 15 Hexagonal socket (for Tinyantenna) H8 mm ThinkCentre/Tiny Common tool 16 Adjustable Torque Screwdriver 0.2 Nm to 4.0 Nm, All Threadripper CPU, CAMM, etc 17 ESD Mat ESD Mat All Common tool Common tool 18 USB Flash Drives 19 USB-C to USB-A Converter For Golden Key, Chrome Reloads, AutoPilot, etc For USB-C only systems All Common tool All Common tool 20 SSD/WWAN/IC Thermal pad Thermal pads are typically All used under the SSD/WWAN/IC in different thicknesses, the most common being 0.5 mm. 21 Silicone grease for CPU or heatsink N/A All repairing 22 Polyamide tape N/A All Consumable Consumable Consumable 46 M90a Pro Gen4 Hardware Maintenance Manual No. Tool name Specification Product scope Tool type 23 Mylar tape N/A All Consumable 24 Eraser N/A All Consumable 25 Electrical tape N/A All Consumable 26 Double sided tape N/A All Consumable 27 Conductive tape N/A All Consumable 28 Cleaning pads/wipes N/A All Consumable 29 Heat gun 30 Brown brush N/A 25 mm to 35 mm wide All Special Tool (Depot only) All Special tool 31 Contact Cleaner Spray 32 Hexagonal socket WD-40 Contact Cleaner for battery connector 17 mm ThinkPad X1 Carbon Yoga AIO 7 27ACH6/ Yoga AIO 7 27ARH6 Special tool Special tool Note: The silicone grease can be applied to the surfaces of the CPU and heat sink to eliminate air gaps. For parts with silicone grease applied, it is suggested that you apply new grease during the installation. Major FRUs and CRUs Your computer contains the following types of CRUs and FRUs: · Self-service CRUs: Refer to parts that can be installed or replaced easily by customer themselves or by trained service technicians at an additional cost. · Optional-service CRUs: Refer to parts that can be installed or replaced by customers with a greater skill level. Trained service technicians can also provide service to install or replace the parts under the type of warranty designated for the customer's machine. · FRUs: Refer to parts that are more complicated to replace and it is recommended that these should be replaced by trained service technicians. If customers elect to replace the FRU by themselves, we recommend that you ensure the correct instructions provided by Lenovo are carefully followed. Chapter 6. Hardware removal and installation 47 48 M90a Pro Gen4 Hardware Maintenance Manual Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Description UltraFlex V Stand* UltraFlex V Stand base* Full-function monitor stand* Full-function monitor stand base* System board shield VESA® mount bracket Cover presence switch (intrusion switch)* GPU card* Thunderbolt card* Microprocessor System board Memory modules* Thermal pads for solid-state drive* M.2 solid-state drives* Wi-Fi card* Wi-Fi card shield* Middle back cover Optical drive* Optical drive bezel, optical drive cable and optical drive bracket* Hard disk drive* Hard disk drive cable* Power supply Power supply bracket LCD panel 65 W ac power adapter for Conference Call Base* Power cord for Conference Call Base* USB-C to USB-C cable for Conference Call Base* LVDS1 cable, LVDS2 cable and LCD power cable Conference Call Base* Mouse* Keyboard* Front decorative cover Power cord Main bracket with thermal pads, rubber and side I/O bracket Self-service CRU Yes Yes Yes Yes No No No No No No No No No No No No No No No No No No No No Yes Yes Yes No Yes Yes Yes No Yes No Optional-service CRU No No No No Yes No No No No No No No No Yes No No Yes Yes Yes Yes No No No No No No No No No No No No No No Chapter 6. Hardware removal and installation 49 Number 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 Description Main frame OSD button wire cable OSD bracket OSD button Rear I/O cover Mechanical gasket 35*5*5mm Mechanical gasket 15*10*6mm Dummy optical drive bezel* Mylar over the computer stand hole* Right bezel Side I/O bezel Internal speakers (2) Wi-Fi antennas (2)* Card reader board* Heat sinks System fan Camera module with cables, radar card and camera hinge cover* Screw kits Self-service CRU No No No No No No No No Yes No No No No No No No No Optional-service CRU No No No No Yes No No No No No No No No No No No No No Yes For detailed FRU and CRU information, such as the FRU part numbers and supported computer models, go to: http://www.lenovo.com/serviceparts-lookup 50 M90a Pro Gen4 Hardware Maintenance Manual System board M90a Pro Gen4 1 LCD backlight power connector 3 LCD LVDS2 connector 5 Camera connector 7 System fan connector 9 SATA2 11 SATA1 13 Cover presence switch connector(intrusion switch connector) 15 Wi-Fi card slot 17 Clear CMOS (Complementary Metal Oxide Semiconductor)/Recovery jumper 19 HDMI in and out connector 21 USB-C (3.2 Gen 2) connector 23 Thunderbolt card connector 25 Audio connector 27 USB 3.2 connectors Gen 2 29 Microphone mute button 2 LCD LVDS1 connector 4 Radar card connector 6 Microprocessor 8 Memory slots 10 Power supply unit connector 12 Hard disk drive power connector 14 Optical disk drive power connector 16 Coin-cell battery 18 DisplayPort out connector 20 Ethernet connector 22 USB 3.2 connectors Gen 1 24 Card reader connector 26 M.2 solid-state drive slots 28 Thunderbolt 4 connector Chapter 6. Hardware removal and installation 51 Removing and installing hardware This section provides instructions on how to remove and install hardware for your computer. Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter 1 "Important safety information" on page 1. Note: When mounting the computer on a VESA mount, position the computer monitor either horizontally (with the screen facing forward and the side I/O ports facing right) or vertically (with the screen facing forward and the side I/O ports facing down). External options You can connect external options to your computer, such as external speakers, a printer, or a scanner. For some external options, you must install additional software in addition to making the physical connection. When installing an external option, see Chapter 3 "Product overview" on page 29 to identify the required connector. Then, use the instructions that come with the option to help you make the connection and install any required software or device drivers. Computer stand Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Turn off the computer and remove all connected devices and cables. 2. Disconnect the computer from ac power and all connected cables. 3. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay it down so that the screen is against the surface and the computer cover is facing up. Replacement procedure Depending on your computer stand, refer to one of the following to replace the computer stand. · Full-function monitor stand 52 M90a Pro Gen4 Hardware Maintenance Manual · UltraFlex III Stand Chapter 6. Hardware removal and installation 53 54 M90a Pro Gen4 Hardware Maintenance Manual Rear I/O cover Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Before you open the rear cover, turn off the computer and wait several minutes until the computer is cool. For access, do the following: Chapter 6. Hardware removal and installation 55 1. Turn off the computer and remove all connected devices and cables. 2. Unlock any locking device that secures the computer cover. 3. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay it down so that the screen is against the surface and the computer cover is facing up. 4. Remove the computer stand, if any. See "Computer stand" on page 52. Removal procedure Note: Some computer models might not be shipped with a serial connector module. In this case, remove the dummy cover for serial connector module first. System board shield Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. 56 M90a Pro Gen4 Hardware Maintenance Manual For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. Removal procedure OSD button and OSD bracket Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. Removal procedure Chapter 6. Hardware removal and installation 57 Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(1) Torque 3 ± 0.5 lb/in Screw (quantity) SCRW M3 XL6(1) Torque 3 ± 0.5 lb/in VESA mount bracket Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. 58 M90a Pro Gen4 Hardware Maintenance Manual Removal steps Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(4) Torque 3 ± 0.5 lb/in Cover presence switch (intrusion switch) Prerequisite Before you start, read Chapter 1 "Important safety information" on page 1 and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. 2. Disconnect the cover presence switch cable (intrusion switch cable) from the system board. Removal procedure Chapter 6. Hardware removal and installation 59 Hard disk drive Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Attention: The internal storage drive is sensitive. Inappropriate handling might cause damage and permanent loss of data. When handling the internal storage drive, observe the following guidelines: · Replace the internal storage drive only for upgrade or repair. The internal storage drive is not designed for frequent changes or replacement. · Before replacing the internal storage drive, make a backup copy of all the data that you want to keep. · Do not touch the contact edge of the internal storage drive. Otherwise, the internal storage drive might get damaged. · Do not apply pressure to the internal storage drive. · Do not make the internal storage drive subject to physical shocks or vibration. Put the internal storage drive on a soft material, such as cloth, to absorb physical shocks. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. · Disconnect the signal cable and the power cable from the storage drive. Removal procedure Optical drive Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: 60 M90a Pro Gen4 Hardware Maintenance Manual · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. · "Hard disk drive" on page 60. · Disconnect the signal and power cable from the optical drive. Removal steps Note: Some computer models might not be shipped with an optical drive. In this case, remove the dummy optical drive bezel first if you want to install a new optical drive. Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(1) Torque 3 ± 0.5 lb/in Chapter 6. Hardware removal and installation 61 Screw (quantity) SCRW M2X3MM*D4(2) Torque 1.5 ± 0.5 lb/in M.2 solid-state drive Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Attention: The internal storage drive is sensitive. Inappropriate handling might cause damage and permanent loss of data. When handling the internal storage drive, observe the following guidelines: · Replace the internal storage drive only for upgrade or repair. The internal storage drive is not designed for frequent changes or replacement. · Before replacing the internal storage drive, make a backup copy of all the data that you want to keep. · Do not touch the contact edge of the internal storage drive. Otherwise, the internal storage drive might get damaged. · Do not apply pressure to the internal storage drive. · Do not make the internal storage drive subject to physical shocks or vibration. Put the internal storage drive on a soft material, such as cloth, to absorb physical shocks. For access, remove the following parts in order: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. Removal procedure Note: A thermal pad might cover the M.2 solid-state drive. To access the M.2 solid-state drive, peel off the thermal pad first. 62 M90a Pro Gen4 Hardware Maintenance Manual Screw (quantity) SCRW M2 CAP L4 NI(1) Torque 1.5 ± 0.5 lb/in Thunderbolt card Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. · "M.2 solid-state drive" on page 62 Removal procedure Chapter 6. Hardware removal and installation 63 Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(2) Torque 3 ± 0.5 lb/in Memory module Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Ensure that you follow the installation order for memory modules shown in the following illustration. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. Removal procedure 64 M90a Pro Gen4 Hardware Maintenance Manual Wi-Fi card and Wi-Fi card shield Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. Removal steps Screw (quantity) SCRW M2 CAP L4 NI(1) Torque 1.5 ± 0.5 lb/in Card reader board Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. Chapter 6. Hardware removal and installation 65 · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. Removal steps Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(2) Torque 3 ± 0.5 lb/in GPU card Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. 66 M90a Pro Gen4 Hardware Maintenance Manual Removal steps Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(2) Torque 3 ± 0.5 lb/in System fan Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. Chapter 6. Hardware removal and installation 67 Removal steps Screw (quantity) SCRW M3 XL10-STEP(3) Torque 3 ± 0.5 lb/in Heat sink Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. The heat sink might be very hot. Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. Removal procedure Notes: · Carefully loosen the screws from the system board to avoid any possible damage to the system board. The screws cannot be removed from the heat sink. · You might have to gently twist the heat sink to free it from the microprocessor. · Do not touch the thermal grease while handling the heat sink. Remove the heat sink depending on the computer model: · Type 1 68 M90a Pro Gen4 Hardware Maintenance Manual Screw (quantity) M-FLAT-PHILLIPS_M3-L4_OD6(9) · Type 2 Torque 3 ± 0.5 lb/in Screw (quantity) M-FLAT-PHILLIPS_M3-L4_OD6(5) Torque 3 ± 0.5 lb/in Microprocessor Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. CAUTION: The heat sink might be very hot. Before you open the computer cover, turn off the computer and wait several minutes until the computer is cool. For access, remove the following parts in order, if any: Chapter 6. Hardware removal and installation 69 · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "VESA mount bracket" on page 58. · "Heat sink" on page 68. Removal steps Notes: · Your microprocessor and socket might look different from the one illustrated. · Touch only the edges of the microprocessor. Do not touch the gold contacts on the bottom. · Do not drop anything onto the microprocessor socket while it is exposed. The socket pins must be kept as clean as possible. System board Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. · "Cover presence switch (intrusion switch)" on page 59. · "Hard disk drive" on page 60. · "Optical drive" on page 60. · "M.2 solid-state drive" on page 62. · "Thunderbolt card" on page 63 70 M90a Pro Gen4 Hardware Maintenance Manual · "Memory module" on page 64. · "Wi-Fi card and Wi-Fi card shield" on page 65. · "Card reader board" on page 65. · "GPU card" on page 66. · "System fan" on page 67. · "Heat sink" on page 68. · "Microprocessor" on page 69. 2. Record the cable routing and cable connections, and then disconnect all cables from the system board. See "" on page . Removal procedure Notes: · Handle the system board carefully by its edges. · The failing system board must be returned with a microprocessor socket cover to protect the pins during shipping and handling. Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(7) Torque 3 ± 0.5 lb/in Coin-cell battery Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. Your computer has a special type of memory that maintains the date, time, and settings for built-in features, such as parallel connector assignments (configurations). A coin-cell battery keeps this information active when you turn off the computer. The coin-cell battery normally requires no charging or maintenance throughout its life; however, no coin-cell battery lasts forever. If the coin-cell battery fails, the date and time information is lost. An error message is displayed when you turn on the computer. Chapter 6. Hardware removal and installation 71 To dispose of the coin-cell battery, refer to the "Lithium coin-cell battery notice" in the Safety and Warranty Guide. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. · "Cover presence switch (intrusion switch)" on page 59. · "Hard disk drive" on page 60. · "Optical drive" on page 60. · "M.2 solid-state drive" on page 62. · "Thunderbolt card" on page 63 · "Memory module" on page 64. · "Wi-Fi card and Wi-Fi card shield" on page 65. · "Card reader board" on page 65. · "GPU card" on page 66. · "System fan" on page 67. · "Heat sink" on page 68. · "Microprocessor" on page 69. · "System board" on page 70. Removal steps Note: A protective film might cover the coin-cell battery. To access the coin-cell battery, remove the protective film first. Note: After installing a new coin-cell battery, reset the system date and time in the UEFI BIOS menu. 72 M90a Pro Gen4 Hardware Maintenance Manual Integrated camera and microphone module Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. 2. Disconnect the integrated camera and microphone module cable from the system board. Removal procedure Note: Some computer models might not be shipped with an integrated camera. In this case, remove the dummy camera cover first if you want to install a new camera. CAUTION: Do not pull out the integrated camera and microphone module cable with force; otherwise, the cable may be damaged. Screw (quantity) SCRW FLAT M3*L4 NYLOK(2) Torque 3 ± 0.5 lb/in Power supply assembly Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. Chapter 6. Hardware removal and installation 73 · "System board shield" on page 56. · "VESA mount bracket" on page 58. · Disconnect the power supply assembly cables from the system board. Removal procedure 74 M90a Pro Gen4 Hardware Maintenance Manual Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(7) Torque 3 ± 0.5 lb/in Side I/O bezel Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. · "Power supply assembly" on page 73. Removal procedure of the side I/O bezel Right bezel Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. · "Power supply assembly" on page 73. Chapter 6. Hardware removal and installation 75 Removal procedure of the right bezel Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(2) Torque 3 ± 0.5 lb/in Internal speakers Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "VESA mount bracket" on page 58. · "Cover presence switch (intrusion switch)" on page 59. · "Hard disk drive" on page 60. · "Optical drive" on page 60. · "M.2 solid-state drive" on page 62. · "Thunderbolt card" on page 63 · "Memory module" on page 64. · "Wi-Fi card and Wi-Fi card shield" on page 65. · "Card reader board" on page 65. · "GPU card" on page 66. · "System fan" on page 67. · "Heat sink" on page 68. · "Microprocessor" on page 69. · "System board" on page 70. · "Power supply assembly" on page 73. · "Integrated camera and microphone module" on page 73. 76 M90a Pro Gen4 Hardware Maintenance Manual · "Side I/O bezel" on page 75. · "Right bezel" on page 75. Removal procedure Screw (quantity) SCRW M3 XL10-STEP(5) Torque 3 ± 0.5 lb/in Main frame Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "OSD button and OSD bracket" on page 57 · "VESA mount bracket" on page 58. · "Cover presence switch (intrusion switch)" on page 59. · "Hard disk drive" on page 60. · "Optical drive" on page 60. · "M.2 solid-state drive" on page 62. · "Thunderbolt card" on page 63 · "Memory module" on page 64. · "Wi-Fi card and Wi-Fi card shield" on page 65. · "Card reader board" on page 65. · "GPU card" on page 66. · "System fan" on page 67. Chapter 6. Hardware removal and installation 77 · "Heat sink" on page 68. · "Microprocessor" on page 69. · "System board" on page 70. · "Power supply assembly" on page 73. · "Integrated camera and microphone module" on page 73. · "Side I/O bezel" on page 75. · "Right bezel" on page 75. · "Internal speakers" on page 76 Removal procedure CAUTION: Do not lift the top of the LCD panel so that the integrated camera and microphone module will not be broken. Screw (quantity) SCRW M3X4MM*D6 FLH NYLOK(11) Torque 3 ± 0.5 lb/in Wi-Fi antennas Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "OSD button and OSD bracket" on page 57 · "VESA mount bracket" on page 58. · "Cover presence switch (intrusion switch)" on page 59. 78 M90a Pro Gen4 Hardware Maintenance Manual · "Hard disk drive" on page 60. · "Optical drive" on page 60. · "M.2 solid-state drive" on page 62. · "Memory module" on page 64. · "Wi-Fi card and Wi-Fi card shield" on page 65. · "Card reader board" on page 65. · "GPU card" on page 66. · "System fan" on page 67. · "Heat sink" on page 68. · "Microprocessor" on page 69. · "System board" on page 70. · "Power supply assembly" on page 73. · "Integrated camera and microphone module" on page 73. · "Side I/O bezel" on page 75. · "Right bezel" on page 75. · "Internal speakers" on page 76 · "Main frame" on page 77 Removal procedure Front decoration cover Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, remove the following parts in order, if any: · "Computer stand" on page 52. · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "OSD button and OSD bracket" on page 57 · "VESA mount bracket" on page 58. Chapter 6. Hardware removal and installation 79 · "Cover presence switch (intrusion switch)" on page 59. · "Hard disk drive" on page 60. · "Optical drive" on page 60. · "M.2 solid-state drive" on page 62. · "Thunderbolt card" on page 63 · "Memory module" on page 64. · "Wi-Fi card and Wi-Fi card shield" on page 65. · "Card reader board" on page 65. · "GPU card" on page 66. · "System fan" on page 67. · "Heat sink" on page 68. · "Microprocessor" on page 69. · "System board" on page 70. · "Power supply assembly" on page 73. · "Integrated camera and microphone module" on page 73. · "Side I/O bezel" on page 75. · "Right bezel" on page 75. · "Internal speakers" on page 76 · "Main frame" on page 77. · "Wi-Fi antennas" on page 78 Removal procedure LCD bracket and LCD panel Prerequisite Before you start, read Generic Safety and Compliance Notices, and print the following instructions. For access, do the following: 1. Remove the following parts in order, if any: · "Computer stand" on page 52. 80 M90a Pro Gen4 Hardware Maintenance Manual · "Rear I/O cover" on page 55. · "System board shield" on page 56. · "OSD button and OSD bracket" on page 57 · "VESA mount bracket" on page 58. · "Cover presence switch (intrusion switch)" on page 59. · "Hard disk drive" on page 60. · "Optical drive" on page 60. · "M.2 solid-state drive" on page 62. · "Thunderbolt card" on page 63 · "Memory module" on page 64. · "Wi-Fi card and Wi-Fi card shield" on page 65. · "Card reader board" on page 65. · "GPU card" on page 66. · "System fan" on page 67. · "Heat sink" on page 68. · "Microprocessor" on page 69. · "System board" on page 70. · "Power supply assembly" on page 73. · "Integrated camera and microphone module" on page 73. · "Side I/O bezel" on page 75. · "Right bezel" on page 75. · "Internal speakers" on page 76 · "Main frame" on page 77. · "Wi-Fi antennas" on page 78 · "Front decoration cover" on page 79 2. Record the cable routing and cable connections, and then disconnect all cables from the LCD panel. Removal procedure Chapter 6. Hardware removal and installation 81 Screw (quantity) SCRW FLAT M3*L4 NYLOK(16) Torque 3 ± 0.5 lb/in 82 M90a Pro Gen4 Hardware Maintenance Manual Chapter 7. Notices and trademarks Notices Lenovo may not offer the products, services, or features discussed in this document in all countries. Consult your local Lenovo representative for information on the products and services currently available in your area. Any reference to a Lenovo product, program, or service is not intended to state or imply that only that Lenovo product, program, or service may be used. Any functionally equivalent product, program, or service that does not infringe any Lenovo intellectual property right may be used instead. However, it is the user's responsibility to evaluate and verify the operation of any other product, program, or service. Lenovo may have patents or pending patent programs covering subject matter described in this document. The furnishing of this document does not give you any license to these patents. You can send license inquiries, in writing, to: Lenovo (United States), Inc. 8001 Development Drive Morrisville, NC 27560 U.S.A. Attention: Lenovo Director of Licensing LENOVO PROVIDES THIS PUBLICATION "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Some jurisdictions do not allow disclaimer of express or implied warranties in certain transactions, therefore, this statement may not apply to you. Changes are made periodically to the information herein; these changes will be incorporated in new editions of the publication. To provide better service, Lenovo reserves the right to improve and/or modify the products and software programs described in the manuals included with your computer, and the content of the manual, at any time without additional notice. The software interface and function and hardware configuration described in the manuals included with your computer might not match exactly the actual configuration of the computer that you purchase. For the configuration of the product, refer to the related contract (if any) or product packing list, or consult the distributor for the product sales. Lenovo may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you. The products described in this document are not intended for use in implantation or other life support applications where malfunction may result in injury or death to persons. The information contained in this document does not affect or change Lenovo product specifications or warranties. Nothing in this document shall operate as an express or implied license or indemnity under the intellectual property rights of Lenovo or third parties. All information contained in this document was obtained in specific environments and is presented as an illustration. The result obtained in other operating environments may vary. Lenovo may use or distribute any of the information you supply in any way it believes appropriate without incurring any obligation to you. Any references in this publication to non-Lenovo Web sites are provided for convenience only and do not in any manner serve as an endorsement of those Web sites. The materials at those Web sites are not part of the materials for this Lenovo product, and use of those Web sites is at your own risk. Any performance data contained herein was determined in a controlled environment. Therefore, the result obtained in other operating environments may vary significantly. Some measurements may have been made © Copyright Lenovo 2023, 2025 83 on development-level systems and there is no guarantee that these measurements will be the same on generally available systems. Furthermore, some measurements may have been estimated through extrapolation. Actual results may vary. Users of this document should verify the applicable data for their specific environment. This document is copyrighted by Lenovo and is not covered by any open source license, including any Linux agreement(s) which may accompany software included with this product. Lenovo may update this document at any time without notice. For the latest information or any questions or comments, contact or visit the Lenovo Web site: https://pcsupport.lenovo.com Trademarks Lenovo, Lenovo logo, ThinkCentre, and ThinkCentre logo are trademarks of Lenovo. Intel, Intel SpeedStep, and Thunderbolt are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries. Microsoft, Windows, Direct3D, BitLocker, and Cortana are trademarks of the Microsoft group of companies. Mini DisplayPort (mDP), DisplayPort, and VESA are trademarks of the Video Electronics Standards Association. The terms HDMI and HDMI High-Definition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC in the United States and other countries. Wi-Fi, Wi-Fi Alliance, WiGig, and Miracast are registered trademarks of Wi-Fi Alliance. USB-C is a registered trademark of USB Implementers Forum. All other trademarks are the property of their respective owners. 84 M90a Pro Gen4 Hardware Maintenance Manual
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