LG KS20 - Main LCD Troubleshooting

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