AOC 2436VH - Page 36

24" LCD Color Monitor AOC 2436Vh
36
9.2.2 Power Board
1) No power
Check CN902 Pin3,4=5V
Check AC line volt 110V or 240V
Check AC input
Check the voltage of C905 (+)
Check bridge rectified circuit and F901 circuit
Check start voltage for the pin8 of IC901
Check R904, R905, Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check IC901
2) Check OVP circuit
OK
OK
NG
Check D906/D907/D908/IC903/IC904/Q901/Q903/ZD902
OK
Check IC901 pin5,6 PWM wave
OK
Check IC901
NG
NG
NG
OK
NG