Dell SE178WFPC Service Manual page 46

17" LCD Color Monitor
9.2.2 Power/Inverter Board
No power
Check CN902 pin3, 4 = 5V
NG
Check AC line volt 110V or 220V
OK
Check the voltage of C907(+)
OK
Check start voltage for the pin3 of IC901
OK
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check IC901 pin8 PWM wave
Check D905,D906,L904,ZD902,Q903,IC903,IC904,......
NG
NG
NG
NG
OK
NG
OK
Check AC input
Check bridge rectified circuit and F901 circut
Check R904,R932,R933 and Change IC901
1) Check IC901
2) Check C908, D901, R909...OVP circuit
Check IC901，ZD905
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Dell SE178WFPC