5.Power Board
1)No power
Check CN902 PIN3, 4 = 5V
NG
Check AC line volt 110V or 220V
OKNG
Check the voltage of C905 (+)
OKNG
Check start voltage for the pin3 of IC901
NG
OK
Check the auxiliary voltage is bigger than 11V and smaller than 25V
Check AC input
Check bridge rectified circuit and F901 circuit
Check R904, R905 and Change IC901
OKNG
Check IC901 pin8 PWM wave
1)Check IC901
2)Check R909/D901/C908/C907circuit
OKNG
Check D906/D907/D908/IC903/Q903/ZD902
Check IC901
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