Power/Inverter Board - Dell E178FPC Service Manual

17" LCD Color Monitor

9.2.2 Power/Inverter Board

No power
Check CN902 pin3, 4 = 12V
NG
Check AC line volt 110V or 220V
OK
Check the voltage of C907(+)
OK
Check start voltage for the pin8 of IC901
OK
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check IC901 pin5 PWM wave
Check D920,L921,ZD920,C922-C925,......
NG
NG
NG
NG
OK
NG
OK
Check AC input
Check bridge rectified circuit and F901 circut
Check R905 and Change IC901
1) Check IC901
2) Check C911, D901, R910...OVP circuit
Check IC901,Q900
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Dell E178FPC