Finaly fix by replacing SMC and ISL6259. Thank you all for help.
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820-3115-B fan maintenance issue (user supplied document no further details)...10-01-2024, 06:14 AM
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Hi everyone,
I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.
🛠 Original Issue
The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.
I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.
⚠️ New Problem: One USB-C Port Only Works in One Orientation... -
Apple MacBook Pro 13 A1278 i5 2.5GHz 820-3115-B Boardview...10-26-2024, 03:30 AM
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Apple MacBook Pro 13 A1278 J30 820-3115-B Schematic & Board View...10-01-2024, 07:17 AM
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Hi! this is a Macbook pro A1278 MB: 820-3115-B. It came to me from another store with an attend to repair. Now im trying myself to repair this one.
It doesn't turn on and there is no green/orange light either.
Im using mac power cable by-3200.
those are the actual voltajes values and missing lines:
im stuck here with this one here. dont know where to look now. im thinking about SMC (i already change it, dont know if it is ok)
thanks for the help!
PPBUS_G3H = 12.26V
PPBUS_S5_HS_OTHER_ISNS = 12.26V
PP3V42_G3H = 3.47V...
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