Service manual

17" LCD Color Monitor AOC 712Si
39
9.2.2 Power Board
Check F801= 12V
NG
Check AC input
Check AC line volt 110V or 220V
Check bridge rectified circuit and F901
circuit
Check the voltage of C907 (+)
NG
Check start voltage for the pin8 of IC901
Check R903 Change IC901
OK
OK
OK
NG
NG
1) Check IC901
2) Check R904/D903 circuit
Check the auxiliary voltage is bigger than
10V and smaller than 20V
NG
Check IC901 pin7 PWM wave
Check IC901
OK
OK
NG
Check Q901/D901/D904/ZD901