20” LCD Color Monitor FSC P20W-3
- 39 -
8.2.2 Power/Inverter Board
No power
Check CN902 pin3, 4 = 12V
pin7,8
=
5V
NG
Check AC line volt 110V or 220V
Check AC input
Check the voltage of C903 (+)
Check bridge rectified circuit and F901 circut
Check start voltage for the pin3 of IC901
Check R903, R904, R905, IC901
NG
Check the auxiliary voltage is larger than 10V and
smaller than 20V
OK
OK
OK
NG
NG
NG
Check Q903,T901,D919,D920,IC902,ZD921,ZD922
OK
Check IC901 pin8 PWM wave
OK
Check IC901
NG
1) Check IC901
2) Check R910,D901,C906…OVP circuit
Содержание FSC P20W-3
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