820-00165 24mA draw from DCPS, no PP5V_S4RS3

djdblaster

New member
Macbook just died by itself. Board is clean, nothing visible have I found. Replaced U7501 and it board tried to boot to 200mA and more, but returned back to 24mA.

PPBUS 8.6V
PP3V42 3.42V
Orange light present

Solder balls around Q7520
 
Last edited:

2informaticos

Administrator
Staff member
Does it power cycle, or just one pulse?
Try to start disconnecting LIO flex.
Also try SMC bypass.

If no change, then check if all voltages try to appears, at least.
ALL_SYS_PWRGD pulses?
 

djdblaster

New member
Well I screwed it up. Changed U7501 and Q7520 thinking that could be problem. Board shorted and Q7560 was blown. Partial short on PP3V3_S5...
 

djdblaster

New member
I ended up full shorting U2800, which is removed now. That can be replaced, right?
No shorts on PP3V3_S5 and PP3V3_S4 now...

Back to square 1. I tried to catch (before messing with anything on board) any pulse on L7520 and it would go up to 1.5-2V and back to 0V.

But first to rebuild U7501, Q7520/60.
 

djdblaster

New member
Alrigh, full short on CPU_VCORE. CPU lights up like Christmas tree. I actually measured this at first when opening board, but didn't want to give hope that yet. I've rebuilt everything, except that U2800, which can be replaced, right?
As for CPU, what would be the best source?
 
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