Main Lcd Trouble - LG -E425 Service Manual

4.13 Main LCD trouble

Main LCD control signals are generated by MSM7225A. Those signal's path are :
MSM7225A -> LCD Module
Yes
LGE Internal Use Only
START
Press Power key to tun the power On
Is the circuit powered?
Yes
Disconnect and reconnect
LCD connector
LCD display OK?
No
Check Power
VREG_MSME_1.8V(TP1)
VREG_LCD_2.8V(TP2)
Yes
Change the LCD Module
END
- 74 -
4. TROUBLE SHOOTING
No
Follow the Power ion
trouble-shooting
No
Change the Main board
Copyright © 2013 LG Electronics. Inc. All right reserved.
Only for training and service purposes