820-01521-a

[iFix]

Hi guys.

3v,5v,1.8v,PP3V3_G3H,PP3V3_G3H_RTC all present no PPVCC_S0_CPU and T2 heats up in time . Any suggestion would be appreciated.

Thanks

 

[2informaticos]

You've probably met with T2 firmware corruption.
Read the threads about DFU restore; a lot of usefull information there.
Be aware, you may need many tries...

BTW, you didn't mention PPBUS_G3H, nor any x_SLPS2R voltage...

 

[iFix]

Hi again. after a long time i'm coming back to this. I got another board but this one has a different issue...

PPBUS_G3H is 20v
PP1V8_SLPS2R - 1.8v
PPDCIN_G3H - 20v
PP3V3_G3H - 3.3v
PP5V_G3S - 5v


and i resoldered U7650 as it seemed funny

 

[iFix]

PPBUS_G3H is 12.6

 

[2informaticos]

Even same board model, different issue requires new thread.
Did you try DFU restore in this new case?

 

[iFix]

Sorry about that. I'll try DFU today and update. Thanks

 

[iFix]

Will it get 20v if the power ic tas5770lb2 is bad and not show picture?

 

[iFix]

i Tried on both board one stuck at 5v the other 2-v both the same cannot use thunderbolt accessory and i did it with 2 cables one is original. Also witht he same cables i flashed a week ago another macbook pro