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Service Manual
11.2 Power/Inverter Board
1.) No power
Check F801 = 14.5V
Check AC line volt 110V or 220V
Check the voltage of C907 (+)
Check start voltage for the pin8 of U901
Check the auxiliary voltage is bigger than
11V and smaller than 25V
Check U901 pin5 PWM wave
Check Q901, U902, U903, D901, D902, D906,ZD901,Q904
NG
NG
OK
OK
NG
OK
OK
OK
Check AC input
NG
Check bridge rectified circuit and F901 circuit
Check R908, R911 and Change U901
NG
1) Check U901
2) Check R913, D904 circuit
NG
Check U901
61
ASUS VH222S&VH222D
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