Main Lcd Trouble - LG GC900F Service Manual

5. Trouble shooting

5.11 Main LCD Trouble

LCD Checking Flow LCD Checking Flow
Start
Press END Key to turn Press END Key to turn
on the power ON on the power ON
Is the circuit powered on?
Is the circuit powered on?
Reconnect FPCB, Reconnect FPCB,
LCD Work well? LCD Work well?
END
END
LGE Internal Use Only
YES YES
NO NO
Follow the Power ON Follow the Power ON
Trouble shooting Trouble shooting
YES YES
NO NO
Is the level at C509 2.85V? Is the level at C516 2.85V?
YES YES
GC900 service manual
Check TP Check TP
YES YES
Check control signal Check control signal
And data And data
YES YES
Check soldering of Check soldering of
CN500,CN510,CN509 CN500
YES YES
Reconnect LCD Module, Reconnect LCD Module,
LCD Work well? LCD Work well?
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NO NO
Change U200
Change U200
NO NO
Change the
Change the
Main board
Main board
NO NO
Re - solder
Re -solder
connectors
connectors
NO NO
Change the slide
Change the slide
key PCB or LCD
key PCB or LCD
Only for training and service purposes