Table of Contents
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WW Service TS
1.
Technical Specifications ........................................................................................................... 4
2.
Working Principle ..................................................................................................................... 4
2.1
General Description ...................................................................................................... 4
2.2
Application processor.................................................................................................... 7
2.3
Power Management ..................................................................................................... 12
2.4
Audio Codec ............................................................................................................... 18
2.5
Wireless Connectivity ................................................................................................. 18
2.6
LTE RF Transceiver .................................................................................................... 19
3.
Main board and Sub FPC layout introduction ......................................................................... 22
3.1
Main board top view ................................................................................................... 22
3.2
Main board bottom view ............................................................................................. 23
3.3
Sub FPC top view ....................................................................................................... 23
3.4
Sub FPC bottom view ................................................................................................. 24
4.
Troubleshooting Procedure ..................................................................................................... 25
4.1
No Boot ....................................................................................................................... 25
4.2
Touch panel have no effect .......................................................................................... 27
4.3
Charging anomaly ....................................................................................................... 28
4.4
Calling receiver sound has poor quality ...................................................................... 31
4.5
Speaker has no sound .................................................................................................. 32
4.6
No screen display ........................................................................................................ 34
4.7
Phone crash ................................................................................................................. 37
4.8
Key has no effect ......................................................................................................... 39
4.9
Communication signal abnormality ............................................................................ 41
4.10
Calling receiver has no sound ..................................................................................... 43
4.11
Display color distortion ............................................................................................... 45
4.12
Speaker tone distortion ................................................................................................ 47
4.13
Speaker tone smaller ................................................................................................... 49
4.14
No charging ................................................................................................................. 50
5
Contents
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3
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