22" LCD Color Monitor AOC 2230FH
41
8.2.2 Power Board
1) No power
Check AC line volt 110V or 220V
Check AC input
Check the voltage of C905 (+)
Check bridge rectified circuit and F901 circuit
Check start voltage for the pin3 of U901
Check R904, R905, R906, Change U901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check U901
2) Check R906/D908 circuit
OK
OK
NG
Check Q901/D900/D903
OK
Check U901 pin8 PWM wave
OK
Check U901
NG
NG
OK
NG
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