820-3208 cuts out booting from ASD OS but runs fine from ASD EFI

[cwalex]

Hi,

I have a liquid damage logic board. One of the RAM chips was badly corroded so I reballed it. The macbook will boot and pass ASD EFI but if I try to boot any OS, either ASD or a USB test drive it just cuts out. Any ideas where to start?

Cheers,

Alex

 

[2informaticos]

Try new BIOS first...

 

[cwalex]

I had a hard time finding one for this model. Found one on the internet and flashed it, same issue remains. I can't be sure this is a good BIOS image though.

 

[2informaticos]

If ME region cause this, you get nothing trying Internet dump read from other machine...

 

[cwalex]

I don't have a donor board for this model. Are you saying that you think the ME region may be what is causing this behaviour? If so, I could clean the ME region.

 

[2informaticos]

Looks like ME issue.

I don't remember where I got them from.
No idea if are really clean even; just for try...
https://drive.google.com/open?id=1zdmJoFVCvNMjuWG0JsaxH4NmDw0SvZ-Y

 

[cwalex]

Cheers, I'll give them a try.

I just tried one that Duke uploaded in this thread: https://www.rossmanngroup.com/boards/forum/board-repair-troubleshooting/4153-820-3208-bios
He forgot to clear the password but the ME region was clean. I removed the password and I still have the same issue. But I'll try the ones you linked to.

 

[cwalex]

Turned out to be the trackpad. Cleaned up some corrosion on the keyboard connector and reflashed the original EFI back and it's now booting up just fine. ASD passes. Thanks for your help anyway.