820-02536 5V 0.100A

[javier_herart]

Hello.
I have no experience on M1/M2 boards. I started to read and tooks the measurements below.
Any advace will be appreciated.

Wont switch to 20V.
Takes 5V and 0.100A
Same behaviour on Magsafe and both C ports
MB looks clean. Couldnt find any blown component nor liquid damage.

Diode:
PPBUS_AON: 589
PP3V8_AON: 542

Voltages:
F5200(PPBUS_AON): 12.3v
L5800(PP3V8_AON): 3.8V
LC320 (PP5V_S2): 5.17V
L8290 (PPVDD_S1_DCS): 0.7V

 

[2informaticos]

What about U8100 and U7700 LDOs?

 

[javier_herart]

U7700
PP0V72_S2_VDD_LOW: 0.74V
PP1V8_AON_SPMU: 1.8V
PP1V2_AON_SPMU: 1.2V
PP0V78_S1_VDD_FIXED: 0.8V
PP1V5_LDOINT_SPMU: 1.49V

U8100
PP1V8_AON: 1.79V
PP3V3_S2_LDO: 3.2V
PP1V2_AWAKE_PLL: 1.2V
PP1V8_AON_MPMU: 1.79V
PP1V2_AON_MPMU: 1.2V
PP3V3_AON: 3.3V
PP0V855_S2SW_CIO: 0.857V
PP3V3_S2SW_SNS: 3.29V
PP1V2_S2_CIO: 1.2V
PP1V5_LDOINT_MPMU: 1.8V

 

[2informaticos]

Is the machine recognized in DFU mode?

 

[javier_herart]

Yes. Should I try revive?

 

[javier_herart]

These are the options I have

 

[2informaticos]

Still stuck at 5V if you connect a charged battery?

Did you also test the board alone, disconnecting all accessories, apart of charger?

 

[javier_herart]

I don't have another battery to test.

Same behavior with only the board connected to the charger

 

[2informaticos]

Sometime sudden death is caused by bad NANDs.
Check if SSD gets correct voltages at least.

 

[javier_herart]

PP2V58_AWAKE_NAND_VCC: 2.5V
PP0V88_AWAKE_NAND_VDD: 0.88V
PP1V25_AWAKE_NAND_VCCQ: 1.25V

What other SSD voltages I can check?

 

[2informaticos]

Voltages look good.
This doesn't assure there is no internal NAND failure.

If no important data, you can try DFU restore.
However, should be good to test with known good battery first.

 

[javier_herart]

Even if it doesn't switch to 20V should I try a battery?

There is important data, can I try revive first?

 

[2informaticos]

Don't try revive yet.
If machine boots with charged battery, the problem should be related with USBC inputs.