Main Lcd Troubleshooting - LG KS20 Operating Instructions Manual

4.16 Main LCD Troubleshooting

Main LCD control signals are generated by MSM7200. The signal path is :
MSM7200 → CN400 → CN602 → CN702 LCD Module
Disconnect and reconnect
The LCD connector(CN702)
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Only for training and service purposes
Start
Press END key
NO
Key LED is on?
Yes
Yes
LCD display OK?
No
Change the LCD module
Yes
LCD display OK?
No
Change the Main board
Yes
LCD display OK?
No
Change the LCD FPCB
4. TROUBLE SHOOTING
GO to power on trouble shooting
END
END
END
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