22" LCD Color Monitor AOC 2230FH
42
2.) No Backlight
Check C811=16V ?
NG
OK
Check adapter circuit
Check ON/OFF signal
Check Interface or main board
NG
OK
Check U801 PIN12=16V
NG
OK
Change on/off circuit
Check U801 PIN5/6 have triangle wave
NG
OK
Change U801
Check U801 PIN9/10 PWM wave
NG
OK
Check U801
Check Q804, Q809 Drain wave
NG
Check the output of T801, T802
Check Q810/Q805/Q811/Q806
Check connecter & lamp, feedback and protect circuit
OK
NG
Change T801, T802
OK
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