AOC LM725
34
8.2.2 Power/Inverter Board
1) No power
Check CN102 pin12 = 12V
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 IC901
Check R906, R907 and Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check IC901
2) Check ZD901、Q902 OVP
OK
OK
NG
Check Q903, T901, D910, D912, L903、L904
OK
Check IC901 pin8 PWM wave
OK
Check IC901
NG
NG
NG
OK
NG
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