Apple MacBook Pro A1990 / Board 820-01041-A / Stuck at 20V 0.05amps

[zeydullak]

Hi there,

We have a new Apple Macbook Pro A1990 which does not power up, no fans, no chime and black screen. We tested USB C port and the results are below:

1. when the board on Apple MacBook Pro connected to the battery --> 20v 0.05amps. Amps goes up to 0.60-0.70 and loops back to 0amps and again again.
2. when board directly connect to the charging cable --> 20v 0.05amps

In this situation where we should start from to test and measure voltage. Does it look like firmware corruption T2 level or looks like to certain chips/elements shorted?

Please advise. Thank you.

Regards,
Zack

 

[2informaticos]

Post PPBUS_G3H and 3V3_G3H_RTC voltages.

 

[zeydullak]

only motherboard:
PPBUS_G3H - 12.6 V
P3V3_G3H_RTC_DEBUG_LED_R - 0 V
PP3V3_G3H_RTC_REG_R - 3.38 V
PP3V3_G3H_RTC_X - 3.38 V

 

[2informaticos]

Check all expected SLPS2R and AWAKE voltages.
If OK, try DFU...

 

[zeydullak]

P1V1SLPS2R_SW0 - 1.1 V
P1V1SLPS2R_SW1 - 1.1 V

P1V8SLPS2R_FB - 1.8 V
P1V8SLPS2R_SW0 - 1.8 V
P1V8_SLPS2RSW_DFR_R - 0 V

PP0V8_SLPS2R - 0.8 V
PP1V25_SLPS2R_SMC_AVREF - 1.25 V
PP1V8_SLPS2R - 1.8 V
PP1V8_SLPS2R_SOC_LPADC_RC - 1.8 V
SOC_RED_SLPS2R - 0 V

PP1V2_AWAKE - 1.2 V
PP1V8_AWAKE - 1.8 V
PP3V3_AWAKE - 3.3 V
SOC_BLUE_AWAKE - 0 V

Is it ok ?

 

[2informaticos]

Looks good.
Tried DFU?

 

[zeydullak]

We can't enter DFU mode, host mac doesn't see anything
attached images: power loop 0 -> 0.7
thank you

 

[2informaticos]

If you have steady SLPS2R and AWAKE voltages, machine should enter DFU.
You may need to force it (wire method).

DFU Mode Restore (Macs) - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area

logi.wiki

 

[zeydullak]

We can enter DFU mode, but Apple Configurator reviving stuck for about 10 minutes and then shows an error.
screenshots attached

 

[zeydullak]

Now it shows(immediately) same error but at the end "... - 0xB(11)]"

 

[2informaticos]

Many times revive doesn't help.
Data is probably lost anyway, but first confirm with customer if you can erase the SSD.
Then try restore.