Service manual

19" LCD Color Monitor I-INC AG191A
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8.2 Trouble Shooting
8.2.1 Power Board
1) No power
Check CN902 pin12 = 12V
Check AC line volt 110V or 220V
Check AC input
Check the voltage of C907 (+)
Check bridge rectified circuit and F901 circuit
Check start voltage for the pin8 of IC901
Check R903 Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check IC901
2) Check R904/D903 circuit
OK
OK
NG
Check Q901/D901/D904/ZD901
OK
Check IC901 pin7 PWM wave
OK
Check IC901
NG
NG
NG
OK
NG