Main Lcd Trouble - LG AT&T GR500 Service Manual

4. TROUBLE SHOOTING

4.8 Main LCD Trouble

LCD control signals are generated by DB3200.
①
Disconnect and Reconnect the 70pin (Main)
①
YES
②
Disconnect and Reconnect the LCD FPCB 40pin and
②
37pin LCD connector (SUB KEY PCB)
LGE Internal Use Only
START
Press END Key
to turn on the power
Is the circuit powered?
YES
or 40 pin (SUB KEY PCB)
LCD Display OK?
NO
LCD Display OK?
YES
The LCD Works
NO
Follow the Power On Trouble Follow the Power On Trouble
NO
Change LCD FPCB or SUB KEY PCB
Change LCD Module
YES
Change the Main Board
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Shooting Shooting
LCD Display OK?
NO
Only for training and service purposes