Main Lcd Troubleshooting - LG CU720 Service Manual

4. TROUBLE SHOOTING

4.17 Main LCD Troubleshooting

Main LCD control signals are generated by MSM6280. The signal path is :
MSM6280 -> CN601 -> CN701 -> CN902 -> LCD Module
Press END key
Key LED is on?
Disconnect and reconnect
The LCD connector(CN601,CN902)
LCD display OK?
Change the LCD module
LCD display OK?
Change the Main board
LCD display OK?
Change the LCD FPCB
LGE Internal Use Only
Start
NO
GO to power on trouble shooting
Yes
Yes
END
No
Yes
END
No
Yes
END
No
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