Main Lcd Trouble - LG GM730 Service Manual

4. 13. Main LCD trouble

Main LCD control signals are generated by MSM7200A. Those signal's path are :
MSM7200A 20-pin LCD connector -> LCD Module
Change the Main BD
Change the LCD module
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Only for training and service purposes
START
Press END key
to turn the power on
Is the circuit powered?
Yes
Disconnect and reconnect
20-pin B to B
connector
LCD display OK?
No
Check VREG_LCD_2.8V, VREG_MSME_1.8V
LCD_RESET_N in Sub BD
No
Yes
Display OK?
No
No
The LCD works
End
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4. TROUBLE SHOOTING
No
Follow the Power ON
trouble shooting
Yes
Yes
LGE Internal Use Only