Owner's Manual for LG models including: 27BA550 LED Monitor, 27BA550, LED Monitor, Monitor
LG 27BA550-B computer monitor 68.6 cm (27") 1920 x 1080 pixels Full HD Black
File Info : application/pdf, 22 Pages, 2.61MB
DocumentDocumentLED MONITOR SERVICE MANUAL CHASSIS : LM47A MODEL : 24/ 27BA550 24/ 27BA560 24/ 27BA550-BA 24/ 27BA560-BA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL71804674 (2405-REV01) Any reproduction, duplication, distribution (including by way of email, facsimile or other electronic means), publication, modification, copying or transmission of this Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual. Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. CONTENTS AUO-General CONTENTS .............................................................................................. 2 SAFETY PRECAUTIONS ........................................................................ 3 SPECIFICATION ....................................................................................... 4 BLOCK DIAGRAM ................................................................................... 7 EXPLODED VIEW .................................................................................... 8 DISASSEMBLY AND ASSEMBLY PROCESS.......................................... 9 TROUBLE SHOOTING GUIDE ................................................................1 6 FIRMWARE UPDATE................................................................. APPENDIX - 2 - Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. SAFETY PRECAUTIONS AUO-General IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the Exploded View. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. General Guidance An isolation Transformer should always be used during the servicing of a receiver whose chassis is not isolated from the AC power line. Use a transformer of adequate power rating as this protects the technician from accidents resulting in personal injury from electrical shocks. It will also protect the receiver and it's components from being damaged by accidental shorts of the circuitry that may be inadvertently introduced during the service operation. If any fuse (or Fusible Resistor) in this TV receiver is blown, replace it with the specified. When replacing a high wattage resistor (Oxide Metal Film Resistor, over 1 W), keep the resistor 10 mm away from PCB. Keep wires away from high voltage or high temperature parts. Before returning the receiver to the customer, Leakage Current Hot Check (See below Figure) Plug the AC cord directly into the AC outlet. Do not use a line Isolation Transformer during this check. Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor between a known good earth ground (Water Pipe, Conduit, etc.) and the exposed metallic parts. Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more sensitivity. Reverse plug the AC cord into the AC outlet and repeat AC voltage measurements for each exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS which is corresponds to 0.5 mA. In case any measurement is out of the limits specified, there is possibility of shock hazard and the set must be checked and repaired before it is returned to the customer. Leakage Current Hot Check circuit AC Volt-meter always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as antennas, terminals, etc., to be sure the set is safe to operate without damage of electrical shock. Leakage Current Cold Check(Antenna Cold Check) With the instrument AC plug removed from AC source, connect an electrical jumper across the two AC plug prongs. Place the AC switch in the on position, connect one lead of ohm-meter to the AC plug prongs tied together and touch other ohm-meter lead in turn to each exposed metallic parts such as antenna terminals, phone jacks, etc. If the exposed metallic part has a return path to the chassis, the measured resistance should be between 1 M and 5.2 M. When the exposed metal has no return path to the chassis the reading must be infinite. An other abnormality exists that must be corrected before the receiver is returned to the customer. To Instrument's exposed METALLIC PARTS Good Earth Ground such as WATER PIPE, CONDUIT etc. - 3 - Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. General Specification No Item 1 Customer BRAND Content 2 User Model Name 24BA560/24BA550/24BA450/27BA560/24BA550/24BA450 3 Sale region Word Wide 4 Feature 23.8" & 27" Monitor 5 Chassis Name LM47A External SW 5-WAY Joystick Switch &Adj. (Menu, Input, Game Mode, Power Off , Exit ) 6 General Scope Function Game mode, FreeSync, HDR HDMI , DP Input USB Upstream 1ea, USB2.0 Down 2ea, USB3.2 Down 2ea Length : 1.87±0.05 M 7 Power Cord Shape : Desk top Color : Black Length :1.8m±0.05 M USB 3.0 UP Shape : Detachable Type Color : Black 8 Cable Display Port Length : 1.8 m±0.05 M ,Shape : Detachable Type . Color : Black 9 Power HDMI Length :1.8m±0.05 M Shape : Detachable Type Color : Black Model: ADO-40W1 19 Input: AC100~240V 50~60Hz, 1.5 A Max Output: DC 19V 2.2A 41.8W, Model : 24/27BA560&550 Power board Model: ADO-28W1 19 Input: AC100~240V 50~60Hz, 1.5 A Max Output: DC 19V 1.6A 30.4W, Model : 24/27BA450 Remark Support P/No :Refer to Accessory table(Defend on suffix) AUO P/No : 50.M2721.003 LGE P/No. : COV37849201 AUO P/No: 50.M2721.002 LGE P/No. : COV37849101 AUO P/No: 50.M2721.001 LGE P/No : COV37849001 41.8W & 30.4W power Board LGE P/No : EAY65899302 EAY65899202 Manufacturer : SHENZHEN HONOR ELECTRONICS CO.LTD 10 Applying module list P/No Specification LGD OPEN Cell: - 4 - Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General Type Name : MN238FG01 LGE P/No: COV37825701 AUO P/No: 9F.M2307.S01 Module Type name: MN238FG01.0 23.8" SERVICE LCM MODULE FLAT FHD LM238WF2-SJX2 BM (AUO Dummy LCM module) 11 Screw Type Name : MN270FG01 LGE P/No: COV37849401 AUO P/No: 9F.M2721.S01 Module Type name: MN270FG01.0 27" SERVICE LCM MODULE FLAT FHD AUO OPEN Cell: LM270WF7-SJX2 BM (AUO Dummy LCM module) AUO P/No : 86.8A524.5R0 M3 x L5, 16ea AUO P/No : 86.00000.629 M4 x L5, 1ea - AUO P/No : 86.00000.591 M3 x L6, 3ea AUO P/No : 86.00000.557 M3 x L8, 2ea AUO P/No : 86.00000.175 M3 x L3, 2ea All models common - 5 - Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General 2. Signal Timing (Resolution) 2-1.Signal (Video &Sync) Video C Sync D E F B A 2-2. H/V Timing : DP input & HDMI 1 / 2 input mode section polari ty DOT CLOCK [MHz] Frequency [kHz]/[Hz] Total Period(E) Display (A) Front Porch (D) Sync. (C) Back Porch (B) Resolution Support or not HDMI1/2 DP H(Pixels) - 1 V(Lines) - 25.175 31.469 59.94 800 640 16 96 48 525 480 10 2 33 640 x 480 Yes Yes H(Pixels) + 37.879 1056 800 40 128 88 2 V(Lines) + 40.00 60.317 628 600 1 4 23 800 x 600 Yes Yes H(Pixels) - 48.363 1344 1024 24 136 160 3 V(Lines) - 65.00 60.0 806 768 3 6 29 1024 x 768 Yes Yes H(Pixels) + 79.976 1688 1280 16 144 248 4 135.00 1280 x 1024 Yes Yes V(Lines) + 75.025 1066 1024 1 3 38 H(Pixels) + 5 V(Lines) + 148.50 67.50 60 2200 1920 88 44 148 1920 x 1080 Yes Yes 1125 1080 4 5 36 H(Pixels) + 84.364 2200 1920 88 44 148 6 185.60 1920 x 1080 Yes Yes V(Lines) + 74.990 1125 1080 4 5 36 H(Pixels) + 137.26 2080 1920 48 32 80 7 285.50 1920 x 1080 Yes Yes V(Lines) + 119.982 1144 1080 3 5 56 H(Pixels) + 111.857 2720 2560 48 32 80 8 304.25 2560 x 1440 Yes Yes V(Lines) - 74.971 1492 1440 3 10 39 H(Pixels) + 198.317 2080 1920 48 48 64 *9 412.50 1920 x 1080 Yes Yes V(Lines) - 179.961 1102 1080 3 5 14 * 9 Timing : Recommended timing at the HDMI and DP input 2-3. HDMI Video Input 1 2 3 4 Factory support mode (Preset Mode) 480P 720P 1080P 1080P Horizontal frequency (KHz) 31.5 45 67.5 135 Vertical frequency (Hz) 60 60 60 120 - 6 - Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. Circuit Block Diagram AUO-General - 7 - Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. EXPLODED VIEW IMPORTANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in the EXPLODED VIEW. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. 400 SC1 910 911 900 510 SC6 SC4 532 531 533 540 512 543 TA2 530 SC3 544 700 HC1 HP1 SC5 HS1 120 HL1 TA3 120 560 HR3 CA5 LV1 TA1 200 CA7 300 CA6 Copyright © LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General DISASSEMBLY AND ASSEMBLY PROCESS 0. Tool Required List the type that would typically be used to disassemble the product to a point where components and materials requiring selective treatment can be removed. Tool Description Tool information Screw driver Crowbar - 9 - Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. 1. Disassembly flow chart AUO-General - 10 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General - 11 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General - 12 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General - 13 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General - 14 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General - 15 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. TROUBLE SHOOTING GUIDE 1. No Power N Check the voltage of CD21(19V) Is power cord connected well? Y N Check the voltage of ED2(5V) Y N Check the voltage of CD58(3.3V) Y N Check the voltage of CD14(1.0V) Y Change base board Change UD1 and re-check it(19v to 5v IC) Change UD3 and re-check it(5V to 3.3V IC) Change UD2 and re-check it(5V to 1.0V IC) AUO-General - 16 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. 2. No Display Backlight is on ? (BL_ON = Hi) N N Check the voltage of DB801 Pin1 >40V Y Check the voltage of CM1 and check the QM1 output (5V) Y N Change the QM1 and re-check it Check Panel LVDS CLK N CNF1(#10,11, 22,23) Y N Check the L V D S Cable status Y Change Module or T-Con board U1 checking and change Scaler Change the LVDS Cable Change Driver IC AUO-General - 17 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. 3. No Display for HDMI input Check the host signal such as PC and graphic card Y Check the HDMI cable is from BOX packing, and connected well or not Y N Check the HDMI Jack Status(HDMI) Change the HDMI Jack Y N Check the EDID by I2C Y Change Main Scaler IC EDID data download 4. No Display for DP input Check the host signal such as PC and graphic card Y Check the DP cable is from BOX packing, and connected well or not Y N Check the DP Jack Status(DP) Y Change Main Scaler IC Change the DP Jack AUO-General - 18 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. FIRMWARE UPDATE Required Item : AUO-General - 19 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General - 20 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-General - 21 Copyright © 2024 LG Electronics Inc. All rights reserved. Only training and service purposes. AUO-GeneralMicrosoft Word 2013