LG GW620 - Main LCD Trouble

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Only for training and service purposes
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4. TROUBLE SHOOTING
4. 15. Main LCD trouble
Main LCD control signals are generated by MSM7200A. Those signal’s path are :
MSM7200A Æ LCD_FPCB -> LCD Module
The LCD works
START
Press END key
to turn the power on
Is the circuit powered?
Follow the Power ON
trouble shooting
LCD display OK?
Check TP1 (2.8V, C2),
TP2 (1.8V, C10)
MDDI Filter (FL1)
TP3 (D1) in LCD_FPCB
No
Yes
Yes
Disconnect and reconnect
LCD connector
Change the Main BD
No
End
Yes
Change the LCD module
Change the LCD_FPCB
No
Yes
No
LCD display OK?