Topview A2281Wd+ - Page 38

22” LCD Color Monitor Topview A2281Wd+
38
8.2.2 Power Board
No Power
Check AC line volt 110V or 220V
Check AC input
NG
OK
Check the voltage of C905(+)
Check bridge rectified circuit and F901 circuit
Check start voltage for the pin3 of IC901
Check R904, R905, R906 and Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check IC901
2) Check D900, D901 circuit
OK
OK
NG
Check Q901/Q903/IC903/IC904/ZD921/ZD922
OK
Check IC901 pin8 PWM wave
OK
Check IC901
NG
NG