No Backlight - Asus VW223 Service Manual

Service Manual

2.) No Backlight

Check ON/OFF signal
Check U52 PIN10=24V
Check U52 PIN8/9 have triangle wave
Check U801 PIN9/10 PWM wave
Check Q56 Drain wave
OK
Check the output of T51, T52
Check connecter & lamp, feedback and protect circuit
OK NG
OK
NG
OK
NG
OK
NG
NG
OK
NG
Check Interface or main board
Change on/off circuit
Change U52
Check U52
Change Q56
Change T51, T52
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ASUS VW223