Main Lcd Trouble - LG U300 Service Manual

4.13 Main LCD Trouble

Main LCD control signals are generated by MSM6250A. Those signal's path are :
MSM6250A → MAIN B'd → CN602 → LCD FPCB and LCD Module
And check the LCD connector
START
Press END key
to turn the power on
Is the circuit powered?
Yes
Disconnect and reconnect
the LCD Connector
LCD display OK?
No
Change LCD Module
LCD display OK?
No
Change LCD FPCB
LCD display OK?
No
Change Main Board
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4. TROUBLE SHOOTING
No
Follow the Power ON
trouble shooting
Yes
Yes
Yes
The LCD works