LG GD580 - Main LCD Trouble

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4. Trouble Shooting
4.7 Main LCD Trouble
LCD control signals are generated by DB3150.
START
Press END Key
to turn on the power
Is the circuit powered?
Reconnect the LCD FPCB 37pin(CN701)
LCD’s Operation is OK?
Follow the Power On Trouble
Shooting
YES
NO
LCD Works
YES
1
Change Main Board
LCD display OK?
Change U502
NO
Change LCD
NO
YES
Is the backlight on?
C703( TP1 ) =3.2V?
NO
NO
C514( TP2 ) =2.8V?
Change Main FPCB
NO
LCD’s Operation is OK?
2
3
NO