Service Manual

1. Precautions

1. Use only demagnetized tools specifically designed for small electronic repairs; most electronic parts are sensitive to electromagnetic forces.
2. Use only high-quality screwdrivers when repairing products. Poor-quality screwdrivers can easily damage the heads of the screws.
3. Always use genuine spare parts. Parts from third parties may not function properly or may even cause damage.
4. The following parts require calibration to ensure proper function after repair: Sensors (proximity, fingerprint), dual camera, touch screen panel, speaker, motherboard, and more. Please contact a TCL authorized Repair Center for calibration.
5. The IPXX degree of protection cannot be guaranteed in the event of repair by the user or by an unqualified person.
6. If the device has suffered from water/liquid damage, you may have the option for repair, but this may exceed the value of the device, depending on the level of damage.
7. For detailed diagnosis, please contact a TCL authorized Repair Center.
8. Do not remove, damage, heat, short circuit, or disassemble the battery. If you need to replace the battery, screen, or motherboard, go to a TCL authorized Repair Center for repair.
9. Before any repair, back up personal information and important data, and then proceed with the repair.
10. Many semiconductor parts inside the device are sensitive to electrostatic discharges that can cause unrecoverable damage. Set up and work in an Electrostatic Protected Area (EPA) to avoid electrostatic discharge before opening the device for repair.
11. Before repairing the device, ensure it is turned off.
12. Repair the device in a safe/explosion-proof environment. If the device is damaged, emits smoke, or if you smell a burning odor, stop repairing/using the device immediately. Use a fire extinguisher or fire-proof box, and contact TCL.
13. When removing the back cover, be careful not to damage the product, especially the battery. Recommended safety equipment: Glasses/Gloves/Mask, etc.
14. Before assembly, ensure there are no screws or foreign objects around the battery.
15. Before assembly, ensure there are no abnormalities before reattaching the back cover.

2. General Product Information

3. Maintenance preparation

3.1. Handset with at least 50% battery charges

3.2. Supported SD card and SIM card, 5V2A Charger, Type-C USB Cable

3.3. PC with below configurations to do software update by using PC tool:

• CPU: Equal to Pentium 1.6 GHZ or above
• RAM: 4GB or above
• Hard Disk: 10GB or above
• Operation System: Win7/Win8/Win10
• USB port
• Internet connection with minimum internet speed of 8Mb/s

3.4. Backup the user data before repairing. There are two ways below for your reference:

• Method 1: Go to "Settings" > "System" > "Backup" (this function may appear under different menus according to the type of device) > Touch "Turn on" in the window which has now opened > Touch "Back up Now". You need to add your Google account details first. App data, SMS text messages, Device settings, Call history, and Contacts will be backed up. For more back up & sync help, please continue touch "Photos & videos" > touch the trigger beside "Back up & sync".
• Method 2: You can back up your data to another phone via the "Switch Phone" app, and then recover data when your phone has been repaired. Swipe up in the home screen to find the search bar > enter "switch phone" and then touch "search" > Touch to open "Switch Phone" on the search results page > Transfer the contents by following the instructions.

4. Factory Reset

Factory reset will reset your phone to restore it to its factory settings. This will delete all data including files and downloaded apps. Please back up the user data before doing factory reset.

4.1. Remove Google account before doing factory reset

If a Google account is not removed before doing the factory reset, it is not possible to set up the device with another Google account at initial setup after the factory reset. It will require you to log in with your previous signed-in Google account. It is recommended that you log out of the Google account.

You can go to "Settings" > "Account" > touch your google account > "REMOVE ACCOUNT" > touch "REMOVE ACCOUNT" > touch "OK" to confirm.

4.2. Factory Reset

You can follow the below steps to perform factory reset when the phone is powered on:

Go to main menu > Settings > System > Reset > Erase all data (factory reset) > Erase all data > Erase all data.

4.3. Recovery mode

How to use: Long press "Power" Key + "Volume up" key in power off mode to enter recovery mode.

When to use: When you cannot start your handset, or when there is something wrong during switch on, or when the device cannot charge.

Consumer personal data format: It will format consumer data, and the memory and settings of your product will return as released from factory.

Factory Reset Click-through Steps:

1. Power off the device. Long press the "Power" Key + "Volume up" key until the LCD lights on.
2. Press the "Volume" key to select "Wipe data/factory reset" and press the "Power" key to confirm.
3. Select "Factory data reset" and press the "Power" key to confirm.
4. Select "Reboot system now" and press the "Power" key to confirm.

5. Software Update

It is suggested to upgrade the handset software to the latest version for better performance. Before upgrading, please remember to back up your data and keep your phone fully charged.

5.1. Software update by FOTA

Firmware-Over-The-Air ("FOTA") is a way in which the firmware of a mobile device is updated wirelessly by the device's manufacturer. Firmware runs in the background without any input from the user, to ensure that the device's hardware runs properly. Navigate to your device's "Settings" > "System" > "System Updates" > "CHECK FOR UPDATES".

5.2. Software update by using Mobile Upgrade tool

1. Download the SW upgrade tool "Mobile_Upgrade_S_Gotu2_v1.2.0" from the website:
   • TCL 30: https://www.tcl.com/global/en/service-support-mobile/tcl-30.html
   • TCL 30Plus: https://www.tcl.com/global/en/service-support-mobile/tcl-30plus.html
2. Open the downloaded "Mobile_Upgrade_S_Gotu2_v1.2.0_Setup.exe" file and choose the language, then install the tool according to the prompt.
3. After finishing the installation, click "Finish" and restart your computer.
4. Open the tool, choose the language, select the model "T676", click "Start" > "Next". Power off your phone and connect it to the computer via USB cable, waiting for the software package to load.
5. A screenshot shows the "Mobile_Upgrade_S_Gotu2_v1.2.0_Setup" executable file with a download icon.
6. The tool displays "Information has been successfully read from device." with Status: 0% and Elapsed time: 00:03:07.
7. A progress bar shows "Loading software package from server. Please wait..." with Status: 20MB/5573MB, 0.37%, 400KB/s, and Elapsed time: 00:05:16.
8. The progress bar updates to show "Loading software package from server. Please wait..." with Status: Download Complete! Elapsed: 1250 s, average speed: 456, and Elapsed time: 00:25:47.
9. The progress bar shows "Successful download of software package to local computer, Please wait..." with Status: 100% and Elapsed time: 00:26:57.
10. Click "OK" and disconnect your phone from the USB cable when the tool pops up the prompt "Please disconnect your device from the USB cable to proceed".
11. Click "Upgrade device" and connect your phone to the computer, waiting for the upgrade.
12. A progress bar shows "Loading SYSTEM_A file..." with Status: 100% and Elapsed time: 00:00:14.
13. Another progress bar shows "Download flash now...632MB." with Status: 56% and Elapsed time: 00:03:54.
14. A dialog box titled "Mobile Upgrade S Gotu2" states: "Thanks for using Mobile Upgrade tool. Your device has been successfully upgraded. Please take a couple of minutes to give your comments and suggestions about the upgrade tool." with buttons for "Yes" (是) and "No" (否).
15. A final status message indicates: "Your device has been successfully upgraded and it is now ready for using."

6. Function Test with Support Centre

1. Check that the SD card is inserted correctly.
2. Power on the product to launch the auto test.
3. If the product displays "input NCK code", this means the software is Network locked or SIM locked, and can only be used with a dedicated SIM card. Use the relevant SIM card or enter the phone NCK code if available.
4. Open the "Support Centre" app > Click "Agree" > "Hardware diagnosis" > "START TESTING" and allow all the app permissions and follow the prompts.

The "Support Centre" app interface is shown, with options like "Help & feedback", "FAQ", and "Special function" including "Hardware diagnosis".

The "Hardware diagnosis" screen is displayed, showing tests for "Communication", "Network", "Battery temperature", "Bluetooth", "Light sensor".

A "Permissions needed" dialog appears, requesting access to "Camera, Microphone, Your location, Phone permissions" for full testing. An "OK" button is present.

Subsequent screens show the app requesting permissions for "take pictures and record video?", "Allow Support Centre to access this device's location?", "Allow Support Centre to record audio?", and "Allow Support Centre to make and manage phone calls?", with options like "WHILE USING THE APP", "ONLY THIS TIME", "DON'T ALLOW", and "ALLOW".

The "Test result" screen shows "Checking is over. No problem." with results for "Communication" (Not test), "Network" (Not test), "Battery temperature" (Pass), "Bluetooth" (Pass), "Light sensor" (Pass), "Proximity sensor" (Pass), "Gravity sensor" (Pass).

7. Troubleshooting

7.1. What should I do if my device reboots by itself?

1. If the issue appears occasionally, it may be caused by anomalies in a file. It is recommended that you continue to use the device normally.
2. Check if the issue occurs during charging. If yes, we recommend trying the official charger and data cable.
3. If the issue occurs while using a third-party app, make sure the app is compatible with your device and Android version. Try uninstalling the third-party app.
4. If the issue occurs while using the built-in app, try to reset or update your device.

7.2. What should I do if my device system lags or freezes?

1. Try to restart your device.
2. Charge your device until the battery level is at least 20%.
3. Too many apps running in the background or the system cache not being cleared may cause a system lag. Touch the Menu key at the bottom corner of the screen to view recently used applications. Touch "Clear all" to close the tasks.
4. Uninstall unused apps from time to time to ensure that your device has sufficient storage space.
5. If the issue occurs in third-party apps, please uninstall the third party apps responsible.
6. If you are playing a game, watching online video, or listening to online music, your device may lag or freeze because of a poor network connection. Enable Airplane mode for a few minutes, then disable it and check your network connection again. Alternatively, move to a location with a better network connection.
7. Try to reset or update your device.

7.3. What should I do if my device cannot charge or charges slowly?

1. Check if there is any visible damage to the charger USB, the charger itself, or the charging port of your device. If yes, back up your data and take your device and proof of purchase to our repair center for more professional technical assistance.
2. Charge the device with a TCL official charger for at least 30 minutes, then try again.
3. Verify whether there are any third-party power management software apps downloaded. If so, please uninstall these.
4. Please do not use the device for a long time while it is charging.
5. Try to reset or update your device.

7.4. What should I do if my fingerprint unlock function works slowly or fails?

1. Pattern, PIN, or Password security unlocking is required after the device restarts. Fingerprint unlock does not function at this point but will work again after unlocking using another method.
2. Make sure there are no stains such as water or sweat on the fingerprint sensor. If there are, wipe the screen and try again.
3. Try to re-enter your fingerprint to your device by accessing "Settings" > "Security & biometrics" > "Fingerprint".
4. Try to reset or update your device.

7.5. What should I do if my device's battery drains under normal use?

1. Check if the device is in a high or low temperature environment. If yes, we advise you to use it only under normal operating conditions.
2. Deactivate Bluetooth, Wi-Fi, or GPS when not in use.
3. The battery drains quickly when playing games and watching videos. This is normal when running large games for a long time or watching videos.
4. Too many apps running in the background or the system cache not being cleared may cause battery draining. Touch the Menu key in the bottom corner of the screen to view recently used applications. Touch "Clear all" to close the apps.
5. Try to reset or update your device.

7.6. What should I do if my device auto powers off?

1. Power off your device and charge the device with a TCL official charger for at least 30 minutes, then try to power on again.
2. If the issue occurs while using a third-party app, make sure the app is compatible with your device and Android version. Try uninstalling the third-party app.
3. Try to reset or update your device.

7.7. What can I do if my device heats up?

A warning or sensation of heat in the device is the normal consequence of the CPU handling excessive data, which makes the battery warm. It is not harmful to the battery or device even if the device feels hot.

Use the following actions to make your device return to its normal temperature:

1. It is suggested not to expose your phone in sunshine for a long period of time.
2. Close large power consumption applications, such as music, chatting applications, GPS application, 3D gaming, video streaming, etc.
3. Reduce the brightness of the screen to lower the temperature.
4. Avoid using your device while charging.
5. Avoid using a protective case that does not dissipate heat. Remove your protective case if your device heats up.

7.8. What should I do if my device cannot power on?

1. Charge the device with a TCL official charger for at least 30 minutes, and then try to power on again.
2. Press and hold the power key for 10 to 15 seconds until the device vibrates, to perform a forced re-boot.
3. Try to reset or update your device.

If the previously described options do not help, you can contact our hotline or repair center to get more professional technical assistance. Find the hotline or repair center information from the TCL website or APP "Support center".

8. Contact of TCL hotline and service centers

If you are looking for official professional repair, please visit HOTLINE & SERVICE CENTERS (tcl.com) and search for the contact in your country/region.

9. Explode View

The exploded view shows the internal components of the TCL 30/30+ smartphone. Key parts include: Furnished Battery Cover, M1.6 screw, Furnished Frame, Side key, Top Speaker electric adhesive, 2M Depth BTB foam, Main_Cam_Electric_Adhesive, 2M Depth Rubber (Red), 2M Micro rubber (Black), 2M Depth Camera, 2M Micro camera, 2M camera adh, 50N main camera, Flash PCBA, Main PCBA SCREW, M1.4 Screw, M1.6 screw, Battery, 1115 Speaker.

Further components are shown: P sensor rubber, Main PCBA, 1115 Speaker, BB SHIELDING Copper foil, Side key FPC, SIM card tray, RF cable 1, Front camera, Front camera rubber, tooling_hole_mylar, P-sensor PET, Furnished Front Casing, LCD + Touch Panel. On the right side: BATTERY PACKAGE FILM, Main FPC, usb rubber, sub PCBA, audio WATERPROOF RUBBER, Sub PCBA SCREW, Fingerprint Module, RF cable 2, Vibrator, BATTERY_PROTECT_FOAM_B, LCD FPC hole mylar.

10. Split View

This section shows a split view of the frame and mainboard components. Numbered parts include: 1, 6, 23, 30, 31, 32, 33, 34, 35, 36, 44, 45, 46, 50. A flex cable labeled "Passat MAIN FPC V2.0" is also depicted.

A detailed view of the mainboard and other internal components is presented. Numbered parts include: 3, 5, 8, 11, 12, 20, 21, 37, 38, 39, 40, 41, 42, 43, 47, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76. The back cover (part 5) and a separate component (part 21) are also shown.

Parts List