Fujitsu FSC P20W-3 Service Manual page 39

20" LCD Color Monitor
8.2.2 Power/Inverter Board
No power
Check CN902 pin3, 4 = 12V
pin7,8＝5V
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 larger than 10V and
smaller than 20V
OK
Check IC901 pin8 PWM wave
OK
Check Q903,T901,D919,D920,IC902,ZD921,ZD922
NG
NG
NG
NG
NG
NG
Check AC input
Check bridge rectified circuit and F901 circut
Check R903, R904, R905, IC901
1) Check IC901
2) Check R910,D901,C906...OVP circuit
Check IC901
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FSC P20W-3