Lcd Troubleshooting - LG GU280 Service Manual

4.14 LCD Troubleshooting

LCD control signals are generated by QSC6240.
The signal path is : QSC6240
Start
Press END key
Key LED is on?
Disconnect and reconnect
The LCD connector(CN102)
LCD display OK?
Change the FPCB
LCD display OK?
Change SUB PCB
LCD display OK?
Change the Main Board
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Only for training and service purposes
CN102 LCD Module
NO
SUB Keypad Backlight Troubleshooting
Yes
Yes
END
No
Yes
END
No
Yes
END
No
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4. TROUBLE SHOOTING
LGE Internal Use Only