820-02020 stuck on 5V 0.03A

SoloHarty

Member
Hi,

We have an M1 MacBook Pro in right now that is stuck on 5V. Customer states it ran out of battery then wouldn't charge. The board is clean with no signs of liquid anywhere.

I have tested all LDOs and none have shorts, I am getting 12.28V on PPBUS_AON but 0v on PP3V8_AON.

No shorts that I can find and It's not picked up on Apple configurator. Is there something I'm missing or am I going in a completely random/wrong direction?

Thanks
 

SoloHarty

Member
Thanks for the quick reply.

U5700:

Pin 8 - 12.28v
Pin 6 - 0v
Pin 7 - 0v
Pin 5 - 0v
Pin 12 - 0v

Pin 8 is getting power but everything else is reading in low mv (60-100mv) but it's the same even when I'm not measuring so I'm assuming its just my multimeter.

EDIT: No shorts on any of those pins either.
 

SoloHarty

Member
Yes R5710 seems to be 0v on both sides. Strange thing, I left it plugged in for a while while I done other repairs and now PPBUS_AON is hard short to ground, definitely wasn't before and U5700 heats up like crazy when I inject 2v to PPBUS_AON. Could a bad u5700 be why I'm getting no voltages?
 

SoloHarty

Member
Removed U5700 and short is gone. Will dig through my donor pile tomorrow to see if i have one. If not then will need to order it in. Could a bad u5700 be the reason i’m missing voltages on the other pins and on both sides of R5710?
 
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