Main Lcd Trouble - LG GT540 Service Manual

4. Trouble Shooting

4. 14. Main LCD trouble

Main LCD control signals are generated by MSM7227. Those signal's path are :
MSM7227 -> LCD Module
Change the LCD module
Yes
LGE Internal Use Only
START
Press END key to tun the power ON
Is the circuit powered?
Yes
Disconnect and reconnect
LCD connector
LCD display OK?
No
Check Power
Yes
VREG_LCD_1.8V(TP1)
VREG_LCD_2.8V(TP2)
No
Change the Main board
The LCD works
END
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No
Follow the Power ON
trouble shooting
Yes
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