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Macbook A2338 820-02020-A

T

tselectronics

New member
Hi,

I have the following problem. Macbook is not powering on at all. No sign of life.
The voltage from the adapter is stuck at 5V.

The voltage PP3V3_S2_UPC on the USB-C Port Controller is missing, but the port doesn't have any short circuits nor does the board.
I see it's coming from PMU: Master LDO (U8100).
PP3V8_AON_MPMU_ISNS_VIN on it IS THERE, but PP3V3_S2_UPC is NOT THERE.

Any idea what I can do? Is this the actual problem?
 
T

tselectronics

New member
No history. It just stopped powering on one day.

LDO 9-PP1V8_AON_MPMU is present - 1.8V.
VLDO 7-PP3V3_S2_UPC is NOT present.
VLDO 3-PP1V2_S2 is NOT present.

VDD_ANA-PP1V5_VLDOINT_MPMU is present 1.5V.

BUCK OUTPUTS on U8100 are not present as well.

I don't think we have U8100, but if we find one and have to change it does it need programming or something?
 
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