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Asus MW221 Service Manual page 36

22" lcd color monitor
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22" LCD Color Monitor
8.2.2 Power/Inverter Board
1.) No power
Check CN903 pin2, 4 = 12V
NG
Check AC line volt 110V or 220V
OK
Check the voltage of C912 (+)
Check start voltage for the pin8 of IC902
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check IC902 pin5 PWM wave
Check Q902, D907, D952, PC951 and T901
NG
OK
NG
OK
OK
OK
Check AC input
NG
Check bridge rectified circuit and F901 circuit
Check R927, R928, R929 and Change IC902
NG
1) Check IC902
2) Check IC902 over current protect circuit
NG
Check IC902
36
ASUS MW221

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