23" LCD Color Monitor Dell SP2309Wc
56
9.2.2 Power/Inverter Board
No power
Check bridge rectified circuit and F901 circut
1) Check IC901
2
rotect circuit
Check CN902 pin7,8,9= 5V
Check the voltage of C903(+)
Check start voltage for the pin3 of IC901
Check R903,R904,R905 and Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
NG
NG
NG
Check Q900, T901, D920, D921, IC902,IC921,
Q923,L922,L921, ZD922, ZD921
Check IC901 pin8 PWM wave
Check IC901,D901,D902
NG
OK
NG
OK
OK
OK
OK
Check AC line volt 110V or 220V
Check AC input
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