eMachines E191W Service Manual page 39

715G2510 1 AO(E191HQ&E181H)
1) No power
Check L904 = 12V
NG
Check AC line volt 110V or 220V
OK
Check the voltage of C905 (+)
OK
Check start voltage for the pin3 of IC901
OK
Check the auxiliary voltage is bigger than
10V and smaller than 20V
OK
Check IC901 pin8 PWM wave
OK
Check Q901/D903/IC903/ZD921/ZD922
NG
Check AC input
NG
Change F901, Check BD901, IC901
NG
Check R904, R932, R933, Change IC901
1) Check IC901
NG
2) Check R909/D901 circuit
NG
Check IC901
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