Service manual

19″ LCD Monitor Wipro WA19W
37
8.2.2 Power/Inverter Board
No power
Check AC line volt 100V~240V
Check AC input
Check the voltage of C905 (+)
Check bridge rectified circuit and F901 circuit
Check start voltage for the pin3 of IC901
Check R904, R905, R906, Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check IC901
2
)
Check D900
/
D901 circui
t
OK
OK
NG
Check Q901/Q903/IC903/IC904/ZD921/ZD922
OK
Check IC901 pin8 PWM wave
OK
Change IC901
NG
NG
OK
NG