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Only for training and service purposes
4. TROUBLE SHOOTING
4.21.1 Touch Trouble Shooting
NO
START
YES
Check the voltage
of TP1 is 2.8v?
LDO (U306 Navi PCB ) has a problem.
Replace U306 or change the board
Check the condition of I2C, Initial sequence
If problem, Re-download SW or Re-soldered
R611,R612,R613, R302,R303, R304
NO
Check TP2,TP3 and
Initial sequence
YES
NO
Check the Main FPCB
YES
Change the Main FPCB
NO
Check the soldering
of CN301
U101(DBB) is broken.
Change the board.
YES
Resolder CN301
2.8_vTOUCH
TP3
TP2
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