Main Lcd Trouble - LG P705 Service Manual

4.14 Main LCD trouble

Main LCD control signals are generated by MSM7227A. Those signal's path are :
MSM7227A-> LCD Module
Change the LCD module
Yes
LGE Internal Use Only
START
Press PWR key
turn the power ON
Is the circuit powered?
Yes
Disconnect and reconnect
LCD connector
LCD display OK?
No
Check Power
Yes
VREG_LCD_2.8V
VREG_LCD_1.8V
No
Change the Main Board
The LCD works
END
No
Yes
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4. TROUBLE SHOOTING
Follow the Power ON
trouble-shooting
Only for training and service purposes