Macbook White 820-2279 not turning on

mushr00m

Member
Customer History: He plugged a MagSafe which he says it was in SHORT and then the macbook shut off forever

First I replaced the DC-IN

Assuming that 16.72V was wrong at PP18V5

However with a new one it showed up the same value

We do have DIM GREENLIGHT

Some of my measurements

PP18V5 16.72V
PP3V42 3.39V
PPBUS_G3H 12.56v
PP5V_S5 5V
 

2informaticos

Administrator
Staff member
A shorted charger, can't damage the laptop; it will not deliver voltage at all.
Fake chinese charger, delivers max voltage all the time.
It can damage SMC through SYS_ONEWIRE line, or at least its protection circuit.

Post Q6940 and U6990 voltages.
You've mentioned 5V_S5, what about 3V3_S5?
 

mushr00m

Member
I do not have a spare board of this model and searching for the schematic they are different.

Can I use any component from a spare board 820-2936 or 820-3115?

I think they are newer versions of this IC but not sure if able to use on older boards
 
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