Acer X233HZ Service Manual page 35

5. Power Board
1) No power
Check CN902 PIN3, 4 = 5V
Check AC line volt 110V or 220V
Check the voltage of C905 (+)
Check start voltage for the pin3 of IC901
Check the auxiliary voltage is bigger than
11V and smaller than 25V
Check IC901 pin8 PWM wave
Check D906/D907/D908/IC903/Q903/ZD902
NG
NG
OK
OK
NG
OK
OK
OK
Check AC input
NG
Check bridge rectified circuit and F901 circuit
Check R904, R905 and Change IC901
NG
1) Check IC901
2) Check R909/D901/C908/C907circuit
NG
Check IC901
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