A1398 820-3332-A unable to restore

[magneh]

Hi everyone.

Got this logic board, turns on , chimes, I can boot and choose pen drive for OSX install, but hangs up everytime near the bar loads.
Same thing with internet recovery.

Run built in diagnostic test, quick test no error.

Any one had similar issues?

What could this be related with?

[piernov]

Re: A1398 820-3332-A unable to restore

Screen is cracked, always describe history of laptop as it can give a lot of hints…

Also has the EFI been messed with? Did you try to run ASD? Boot in verbose mode? Never goes further even after waiting 10 minutes?

Note that this board has an common problem with solder joints of U8900 cracking.

[magneh]

Re: A1398 820-3332-A unable to restore

Screen is cracked, always describe history of laptop as it can give a lot of hints…

Also has the EFI been messed with? Did you try to run ASD? Boot in verbose mode? Never goes further even after waiting 10 minutes?

Note that this board has an common problem with solder joints of U8900 cracking.

Salut Piernov!

Sorry. Yes cracked screen. Built in ASD runs OK in both short and long test.
Check U8900 joints, and seemed fine. Still re flowed them, no change.

EFI IC seems factory soldered.

Strange behaviour.
Tried high sierra and dos dude's catalina usb Stick, the bar blocks as in previous photo.
Does not go further.
If I wait like 20 mins, I see screen going black and fans spinning.
I wake up the device, but I dont get the bar again. Machine like reboots again.

Same thing with Internet recovery.
Strange right?

[magneh]

Re: A1398 820-3332-A unable to restore

Any ideas?

CPU VRMs?
Bad PCH/GPU?

Thanks

[piernov]

Re: A1398 820-3332-A unable to restore

You should use ASD (both EFI and OS mode if possible) not AHT. It gives much more detailed information.
It's not really the symptoms I'd except but maybe there's an ME region issue. I'd try a known good dump with clean ME.

[magneh]

Re: A1398 820-3332-A unable to restore

You should use ASD (both EFI and OS mode if possible) not AHT. It gives much more detailed information.
It's not really the symptoms I'd except but maybe there's an ME region issue. I'd try a known good dump with clean ME.

Salut Piernov,

Thanks for your inputs.

In ASD 3S155 ran the full test and had 1 error in battery condition, but not related with the loading issue, as I tried it without battery and still the same.

I will try to run the ASD OS mode and also check if I can get a good dump to flash the bios also.

Ill update when possible.
Merci