820-01987 missing PP3V3_S5 - 20V, and the amps vary between 0.07a and 0.9a.

[ronaldo]

This Mac was left in a humid and freezing environment overnight, and the next day it stopped working.
There are no signs of corrosion or liquid damage.

When I plug in the charger, the voltage goes to 20V, and the amps vary between 0.07a and 0.9a.
After a few seconds, it drops to 0.03A, rises to 0.9A, and finally goes back to 0.07A, cycling repeatedly.

It's going to DFU and when I try to revive it gets stuck at the loading bar halfway through installing the system, forever and with no error message.

PPBUS_G3H - 12.6V
PP3V3_G3H_RTC 3.31V
PP3V3_G3H 3.3V
PP1V8_SLPS2R 1.8V - Cycling every 17 secs
SIG OUT / PMU_CLK32K_SOC 0.85V - Cycling every 17 secs
PP1V8_AWAKE 1.8V - Cycling every 17 secs
PP1V8_SLPS2R_PMUGPIO 1.8V - Cycling every 17 secs
PP1V1_SLPS2R 1.1V - Cycling every 17 secs
PP0V8_SLPS2R 0.8V - Cycling every 17 secs
PP0V82_SLPDDR 0.82V - Cycling every 17 secs
PP3V3_AWAKE 3.3V - Cycling every 17 secs
PPVDDCPUSRAM_AWAKE 0.8V - Cycling every 17 secs
PP0V9_SLPDDR 0.9V - Cycling every 17 secs
PP1V1_SLPDDR 1.1V - Cycling every 17 secs
PP1V2_AWAKE 1.2V - Cycling every 17 secs
PPVDDCPU_AWAKE 0.75V - Cycling every 17 secs


PP3V_G3H_RTC 3.01V
PP5V_G3S 5.12V drops to 4.7V and back to 5.10V
PP3V3_G3S 3.31V - Cycling every 17 secs
PP1V8_G3S 1.8V - Cycling every 17 secs
P5VG3S_PGOOD 1.25V - Cycling every 17 secs

PPVCCQ_ANI_SSD0 1.8V - Cycling every 17 secs
PP0V9_SSD0 0.59V - Cycling every 17 secs
PP2V5_NAND_SSD0 2.52VCycling every 17 secs

PP3V3_S5=0V
PM_SLP_S5_L=0V

 

[2informaticos]

Try connecting known good battery.

Just in case, do a SMC reset too.

 

[ronaldo]

Just tried another good battery and SMC reset and same issue.
This is the message it gets if leave Apple Configurator trying after 20 minutes.

 

[2informaticos]

Flash SoC ROM and try again DFU.
Don't forget to make backup.

 

[ronaldo]

Do you have the firmware, please?

 

[2informaticos]

A2289 T2 Unlock Data.BIN

drive.google.com

 

[ronaldo]

I'm using the TL866II Plus, but it doesn't have the profile for the IC AT25SF321, so I just remove the IC MX25U3235F from another logicboard that matches the schematics and flashed the firmware. Apple Cong. gives another error message and still not working.

Should I be looking at why PP3V3_S5 is 0V?

 

[2informaticos]

That chip is 1V8 compatible, not for 3V3.

What error do you get now

 

[ronaldo]

TL866II Plus automatically changes the voltage.

I forgot to take a picture of the error message.
I will flash it again.