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3 - 820-4924 boards- Green to Orange - No Fan Spin 19.9V 0.03A

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Phiberop840

New member
So I am fairly new to Apple Logic board repair but not Electroniscs or Soldering. Hoping that you can help me here and tel me the points to check first and what the values should be for each, If this is something already out and solved please link me,

I use an Apple USB C Cable to an Apple Charger 87W USB-C and a USB C Black Test Meter bought from you guys. I have 3 of each board and toasted one of the power boards smoked, turned bright orange then black and never worked since. Not sure what happened, So 3 boards that are like new and same with the rest of the machine. As stated, I have 3 boards and 2 good Power boards, and I get the same on all 3 boards when I check for fan spin using 2 power boards on the 3, The one is dead now. What other rails should I tackle as well is there a quick list to start off with? I will post as soon asa I ksff


Thank you,
M
 
2informaticos

2informaticos

Administrator
Staff member
"I use an Apple USB C Cable to an Apple Charger 87W USB-C and a USB C Black Test Meter"
Why???
This board requires 60/85W Magsafe 2 charger.
Use correct charger and come back with exact voltage for PPBUS_G3H, 3V42 and 3V3_S5/SUS lines.
Also try to start in SMC bypass.
 
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Phiberop840

New member
Thank you for not chewing his head off, l tell them if they get stuck to ask so I give him credit for that. He was using this cable which is convenient but you end up using the wrong power brick, as you noted. This will fry the little power boards. I will come back (or he will) with the appropriate numbers and more, if I don't figure it out. Sometimes I Get lucky. lol. Thank you f0r your time and help. Its really appreciated. The internet can be very mean to new people making dumb mistakes. Thanks for holding back. :)
 
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JohnB8812

New member
Never ever ever ever EVER use anything but an OEM 60/85 watt Magsafe 2 charger on the newer Retinas aka 2015. You probably have no amp pull because of a bad charger...
 
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