Dell E178FPC Service Manual page 48

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
OK
Check IC901 pin5 PWM wave
OK
Check D920,L921,ZD920,C922-C925,......
NG
NG
NG
NG
NG
48
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
Dell E178FPC