I am trying to repair my Macbook A2338 820-02020.
I was able to narrow down the cause to some extent, but I don't have any conclusive evidence to identify the cause, so I would appreciate any advice.
Here is what I did:
When I plugged in the power, the voltage rose to 20V, but there was no change after that, and the CPU did not appear to be working.
I tried to revive it in DFU mode with APPLE Configurator, but it stopped with an error halfway through.
It probably failed when starting the CPU to write.
I measured the power supply of the board, and found that
PPDCIN_USBC_AON was 20V, but
PPBUS_AON was only 12V. The normal voltage is 12.6-13.1V, so it is very low.
According to repair.wiki, if it is 12.28-12.35V, it is a problem with the communication between the SOC and PMICs,
but the voltage is lower than this range.
The other power rails seem fine.
PP3V8_AON 3.8V
PP3V3_S2 3.28V
PP5V_S2 5.17V
PP3V_S2_UPC 3.29V
PP1V25_S2 1.22V
I was able to narrow down the cause to some extent, but I don't have any conclusive evidence to identify the cause, so I would appreciate any advice.
Here is what I did:
When I plugged in the power, the voltage rose to 20V, but there was no change after that, and the CPU did not appear to be working.
I tried to revive it in DFU mode with APPLE Configurator, but it stopped with an error halfway through.
It probably failed when starting the CPU to write.
I measured the power supply of the board, and found that
PPDCIN_USBC_AON was 20V, but
PPBUS_AON was only 12V. The normal voltage is 12.6-13.1V, so it is very low.
According to repair.wiki, if it is 12.28-12.35V, it is a problem with the communication between the SOC and PMICs,
but the voltage is lower than this range.
The other power rails seem fine.
PP3V8_AON 3.8V
PP3V3_S2 3.28V
PP5V_S2 5.17V
PP3V_S2_UPC 3.29V
PP1V25_S2 1.22V
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