Single work

820-2530, Not starting

Description

Have green light on magsafe but won’t power on.
Fan would seem to move lightly…more like a pulse.
Yes PPbus_g3h and stable.
Yes PPv5s3
U2850 doesn’t have all_sys_pwrgd on pin2.
R7820 has all_sys_pwrgd on pin1 and of course, not on pin2.
Q7221 has 0v on pin5, which is good.
U7500 circuit has two missing caps (C7576 and C4101) that had been knocked off.
Replaced the two caps, machine now turns on.
Charges the battery and Passed ASD.

Summary
Created by

ALRC

Completed on

January 6, 2015

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