Power/Inverter Board - IBM L150 Service Manual

8.2.2 Power/Inverter Board

1.) No power
Check to CN102 pin2 = 5V
OK
Check AC line volt 120V or
220V
OK
Check the voltage of C905(+)
OK
Check start voltage for the pin3 of IC901
OK
Check the auxiliary voltage is smaller than 20V
OK
Check R919, D910,,D912, ZD904
NG
NG
NG
NG
NG
NG
Repeating the start voltage
NG
OK
Check Interface board
Change F901 , check BD901,Q903,IC901
Check bridge rectified circuit cFailure point
Change IC901
1) Check IC902, IC903
2) Check Q901,Q902...OVP circuit
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IBM 15" Service Manual