820-0045 20V 0A

[ajdoc]

Board from another shop.

Tested with board only and genuine 87W USB-C charger.
Sometimes it there is spike and consume 0.05A


PPBUS_G3H - 8.60V
PPVIN_G3H_P3V3G3H - 20.1V
PPBUS_S5_HS_COMPUTING_ISNS - 8.61V
PPVBUS_E85 - 20.1V
PP3V3_G3H - 3.30V
PP3V3R3V0_AON - 3.26V
PPVRTC_G3H - 3.29V
PP5V_G3H_LDO - 5.0V
PP5V_S4 - 5.0V
PP5V_S0 - 0.0V got every a few sec there is spike to around 5V
PP3V3_S5 - 3.30V
PP3V3_SUS - 3.30V
PP3V3_S4 - 0.350V (spike to 3.30V every a few seconds)
PP3V3_S0 - 0.0V

I checked and U8990 has been replaced by other shop so I replaced it one more time just in case but still same issue.

As got small experience with A1534 I am lost now…

Thanks

 

[2informaticos]

A1534 is the worst MacBook ever made by Apple.
And 820-00045 is the worst of the worst.
All these end with dead CPU.

I really do NOT recommend to waste time on this, more even if was already touched in other service shop.

"PP5V_S0 - 0.0V got every a few sec there is spike to around 5V"
Then 3V3_S0 should spike too; check diode mode there.
Also check for short on all big coils.