LG LG-E400 - Location & Security

4. TROUBLE SHOOTING
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Only for training and service purposes
LGE Internal Use Only
4.13 Main LCD trouble
Main LCD control signals are generated by MSM7225A. Those signal’s path are : MSM7225A → LCD Module
Press Power key to tun the power On
Is the circuit powered?
Yes
Follow the Power ON
trouble-shooting
No
LCD display OK?
START
No
Yes
Change the LCD Module
Disconnect and reconnect
LCD connector
Yes
END
Change the Main board
No
Check Power
VREG_MSME_1.8V(TP1)
VREG_LCD_2.8V(TP2)