AOC 2230FH Service Manual page 42

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