820-00165, Chimes and shuts down

[donnos]

Originally board hard short on ppbus at C7314. Replaced to remove short.
now board without SSD 90% of the time boots and shows no hdd icon. 10% just won't boot.
with SSD, sometimes chime with fan spin and dies.

tried with external USB bootable. fan spins and dies before apple logo.

 

[2informaticos]

Disconnect internal SSD and boot from USB macOS; still turns off?

 

[donnos]

Yes, i disconnected the internal SSD and let it boot from HDD and it still turns off

 

[2informaticos]

Try starting in SMC bypass and diagnostic mode.

 

[donnos]

no issues getting into diagnostic mode without SSD plugged in. no luck with SSD plugged in and SMC bypass as well

 

[2informaticos]

Try to clean ME.
If you can't do that, find clean ME BIOS for test; some files already uploaded on the forum.

 

[donnos]

so update on this unit. today it decided to boot. ran cpu stress test and no issue... made no changes since last update. *scratching head*