A2159 820-01598-A no power

[hgoncalves]

Hi,

I have an A2159 820-01598 with no power.

First it was pulling 0.70A from ampmeter, and I've tried safe / target boot mode, and DFU restore without success. DFU gave a lost conection error.

After DFU try, now I have board alone on bench, 20V on ampmeter, but 0A.

PPBUS_G3H = 12.62V

PP5V_G3S = 5V
3V3_G3S = 3.3V
1V8_G3S = 1.8V

Can you help?

 

[2informaticos]

Can you post a picture of DFU error?

 

[hgoncalves]

Hi,

Right now it is was on recovery mode, but it also falis when restoring. After a few times, I managed to get it in DFU mode, but got the same error, and it went into recovery mode again.

 

[2informaticos]

Connect both charger and battery (good one), for DFU.

 

[hgoncalves]

Hi,

Same problem with an original charger and known good battery (Restoring and DFU).

DFU fail with the same error, and then goes to recovery mode.

 

[2informaticos]

Try reflashing SoC ROM.
You can also test with empty bin.

 

[hgoncalves]

Can you please share the bin?

Shall I try the SoC ROM first, or BIOS?

 

[2informaticos]

What BIOS?
You have a T2 machine.

Did you try empty bin?

A2159 T2 Unlock Data.BIN

drive.google.com

 

[hgoncalves]

Hi.

I only tried the bin you send me, but I got the same error in DFU mode.

After flashing SoC ROM, the Mac still was in recovery mode. It should be in DFU, correct?

 

[2informaticos]

You must force it in DFU...

 

[hgoncalves]

Hi.

I already done DFU, but it fails with the same error. Using the keys combination it enters in DFU mode (after inicial entering recovery mode after power on).

I realize that now it only pulls 5V from ammeter (but still goes to recovery and DFU modes).

Do you mean force it with the jumpers?

 

[2informaticos]

You should start Restore from DFU, not Recovery mode.

 

[hgoncalves]

I've already done that a few times, but it always fails with the same error.

Any other idea about what to do next?

 

[2informaticos]

Tried empty bin?

You may have problems with NANDs, or T2...

 

[hgoncalves]

Hi,

I don't have an empty bin. Can you share it please?

 

[2informaticos]

What???
You don't know to erase a bin?

 

[hgoncalves]

I've never done that. I suppose I can use the AS programmer to do so, but not sure, and don't want to cause a bigger problem.

Can I erase it with AS programmer?

 

[2informaticos]

Doesn't matter, you can use any supported programmer; same as for reflashing.
Any programmer has Erase option...