18.5" LCD Color Monitor AOC 936Swa
45
9.2.2 Power Board
1) No power
Check CN902 = 14.5V
Check AC line volt 110V or 220V
Check AC input
Check the voltage of C907 (+)
Check bridge rectified circuit and F902 circuit
Check start voltage for the pin3 of U901
Check R918, R924, Change U901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check U901
2) Check OVP circuit
OK
OK
NG
Check Q901/D904/R913/T901/D906/ZD901
OK
Check U901 pin8 PWM wave
OK
Check U901
NG
NG
NG
OK
NG
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