AOC 193P Service Manual page 37

19" LCD Color Monitor
8.2.2 Power/Inverter Board
No power
Check CN102 pin 5/6 = 12V
Check AC line volt 110V or 220V
Check the voltage of C904 (+)
Check start voltage for the pin3 of IC901
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check IC901 pin 8 PWM wave
Check T901,D911, IC902,IC903
NG
NG
OK
NG
OK
NG
OK
NG
OK
OK
Check AC input
Check bridge rectified circuit and F901 circuit
Check R903, R904 and Change IC901
1) Check IC901
2) Check ZD901,Q902,Q903 OVP circuit
NG
Check IC901
37
AOC 193P