Acer AL2051W Service Manual page 37

2. Power Board
No power
Check AC line volt 110V or 220V
Check the voltage of C904(+)
Check start voltage for the pin3 of IC901
Check the auxiliary voltage is between 10V-16V
Check D904, D905,IC902
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No power
NG
OK
NG
OK
OK NG
OK
NG
Check AC line
Check F901, bridge rectified circuit
Check R903, R904,IC901
Check Q902,Q903
Check T901, D902