TCL 20 R 5G, Service Manual

Page: 2 / 19

Service Manual
TCL Communication Technology Holdings Ltd.
Rev.: 1.0 TCL 20 R 5G T767H Service Manual V1.0 Page: 2/19
Confidential and proprietary information contained in this repair guide is subject to change without notice.
Distribution, transfer, copy of any content or data in this document without the written permission of TCL is strictly prohibited.
Content
1. Precautions ...................................................................................................................... 3
2. General Product Information .......................................................................................... 4
3. Maintenance preparation ................................................................................................. 5
3.1. Handset with at least 50% battery charges ............................................................... 5
3.2. Supported SD card and SIM card, 5V2A Charger, Type-C USB Cable ..................... 5
3.3. PC with below configurations to do software update by using PC tool. .................... 5
3.4. Backup the user data before repairing. There are two ways below for your
reference
…………………………………………………………………………………………..5
4. Factory Reset ................................................................................................................... 6
4.1. Remove Google account before doing factory reset ................................................. 6
4.2. Factory Reset ........................................................................................................... 6
4.3. Recovery mode......................................................................................................... 6
5. Software Update ............................................................................................................... 8
5.1. Software update by FOTA ......................................................................................... 8
5.2. Software update by using Mobile Upgrade tool ........................................................ 8
6. Function Test with Support Centre ............................................................................... 11
7. Troubleshooting ............................................................................................................. 13
7.1. What should I do if my device reboots by itself? ..................................................... 13
7.2. What should I do if my device system lags or freezes? .......................................... 13
7.3. What should I do if my device cannot charge or charges slowly? ........................... 13
7.4. What should I do if my fingerprint unlock function works slowly or fails? ................ 14
7.5.
What should I do if my device’s battery drains under normal use? ......................... 14
7.6. What should I do if my device auto powers off?...................................................... 14
7.7. What can I do if my device heats up? ..................................................................... 15
7.8. What should I do if my device cannot power on? ................................................... 15
8. Contact of TCL hotline and service centers ................................................................ 15
9. Explode View .................................................................................................................. 16
10. Split View ........................................................................................................................ 17