Main Lcd Trouble - LG GM750 Service Manual

4. TROUBLE SHOOTING

4.13 Main LCD trouble

Main LCD control signals are generated by MSM7200A. Those signal's path are :
MSM7200A 24-pin LCD connector -> LCD Module
Change the Main BD
Change the LCD module
LGE Internal Use Only
START
Press Power on key
to turn the power on
Is the circuit powered?
Yes
Disconnect and reconnect
24-pin Main to LCD
connector
LCD display OK?
No
Check
VREG_LCD_2.8V, VREG_MSME_1.8V
LCD_RESET_N in
Main BD
No
Yes
Display OK?
No
No
The LCD works
End
- 144 -
No
Follow the Power ON
trouble shooting
Yes
Yes
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes