Dell SP2309Wc Service Manual page 56

23" LCD Color Monitor
9.2.2 Power/Inverter Board
No power
Check CN902 pin7,8,9= 5V
NG
Check AC line volt 110V or 220V
OK
Check the voltage of C903(+)
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 Q900, T901, D920, D921, IC902,IC921,
Q923,L922,L921, ZD922, ZD921
NG
NG
NG
NG
OK
NG
OK
Check AC input
Check bridge rectified circuit and F901 circut
Check R903,R904,R905 and Change IC901
1) Check IC901
2) Check IC901 over current protect circuit
Check IC901,D901,D902
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Dell SP2309Wc