Dell E2209Wc Service Manual page 48

22" LCD Color Monitor
9.2.2 Power/Inverter Board
No power
Check CN902 pin4，5= 12V
NG
Check AC line volt 110V or 220V
OK
Check the voltage of C905(+)
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 D900, T901, D906, D905,
Q902,Q921,IC903,IC904, L904, ZD902, ZD921
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 IC901 over current protect circuit
Check IC901,Q901,D903
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Dell E2209Wc