820-01521 PP3V3_S5 = 0v

[No-Clean]

Clean board I get 20V on charger and 12.6V on PPBUS, here are some more measurements:

PPBUS_G3H = 12.63V
PP3v3_G3H = 3.4V
PP1V8_SLPS2R = 1.8V
PP1V8_AWAKE = 1.8V
PP1V1_SLPS2R = 1.1V
PP0V8_SLPS2R = 0.79V
PP3V3_AWAKE = 3.4V
PP1V2_AWAKE = 1.19V
PMU_PVDDMAIN_EN = 3.3V
P3V3MAIN_PGOOD = 3.26V
PP3V3_G3H_RTC = 3.0V
PCH_RTC_RESET_L = 3.0V
P5VG3S_EN = 1.8 V
PP5V_G3S = 5.4V

PP3V3_S5 = 0v

I also tried restoring T2 on both Catalina and Big Sur and got error 9 something....

 

[2informaticos]

As you get all SLPS2R and AWAKE voltages, machine should enter into DFU.
Check SSD voltages too.

Inspect audio board for liquid sign, on both sides.

 

[No-Clean]

Board does enter DFU, but fails to restore/revive in both Catalina and Big Sur
Audio board is clean and flex too.

PP2V7_NAND = 2.5V
PP1V8_SSD = 1.8V
PP0V9_SSD = 0.9V
SSD0_RESET_L = 1.8V

 

[2informaticos]

There could be a problem with T2 then.
Did you check for short on all big coils?
No pulse at all on 3V3_S5, when trigger PMU_ONOFF_L?

 

[No-Clean]

No shorts on any of the bog coils.

PMU_ONOFF_L is 12.6V how do I trigger it, sorry for the novice question.

 

[TCRScircuit]

PMU_ONOFF_L should not be 12.6v!!!!!! You are measuring wrong, or you have a very bad problem somewhere.

 

[No-Clean]

My bad, I was measuring in the wrong place.

When I trigger PMU_ONOFF_L 3V3_S5 doesn't pulse.

 

[No-Clean]

I can reball T2 no problem, but if that doesn't solve the issue can the T2 chip be replaced from a donor board?

 

[2informaticos]

The client said something about how the fault appeared?
Did you try with known good battery?

 

[No-Clean]

This machines come from other shops with very little to no details.

 

[No-Clean]

Known good battery same problem.

 

[2informaticos]

Very likely bad T2...