Main Lcd Trouble - LG U8290 Service Manual

4. TROUBLE SHOOTING

4.15 Main LCD Trouble

Main LCD control signals are generated by MSM6250. Those signal's path are :
MSM6250 → MAIN B'd → CN300 → CN2 → Key Pcb → CN1 → LCD Module
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 Keypad
LCD display OK?
No
Change LCD Module
LCD display OK?
No
Change Main Board
- 114 -
No
Follow the Power ON
trouble shooting
Yes
Yes
Yes
The LCD works