This Macbook came in with customer stating they had powering/charging issues with one of the ports, now it won't power from both USB-C. After replacing both CD3217 chips and still getting 5V 0.016A I checked the surrounding caps around them and found CF400/CF500 PP3V3_S2 low at .560V. On further inspection I found a burnt coil L8300 which I replaced with a 30Ohm coil (all I had similar) to get 3.7V from PP3V8_AON_VDDMAIN to U8100 MPMU_BSTLQ_LX. Power was briefly at 5V 0.450A but has dropped to 5V 0.016A and I'm not sure where to look next.
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Macbook Air M1 A2337 820-02016
- Thread starter nebula
- Start date
"L8300 which I replaced with a 30Ohm coil"
Did you read L8300 specs in schematic?
Did you read L8300 specs in schematic?
These are L8300 specs:
0.47UH 1.7A 0.175OHM
BTW, did you try DFU?
0.47UH 1.7A 0.175OHM
BTW, did you try DFU?
L8300 is not just a simple series filter coil.
Is part of 5V boost-converter integrated into U8100.
There is a chance that master PMU can be damaged now.
Is part of 5V boost-converter integrated into U8100.
There is a chance that master PMU can be damaged now.
If L8300 was already fried, very likely U8100 was bad too.