820-3476 boot loop

[Jay]

A 820-3476 with no visible liquid damage but liquid damage is suspected (fan is gross but board is immaculate...). When powered on the fan spins, screen turns on and you can hear the chime. A few seconds after the chime you hear the chime again and before the chime can fully play, it chimes again and gets stuck in a loop like that.

CPU gets warm, MagSafe LED acts as expected.

Don't even know where to start looking for the issue here, I assume since it powers on and chimes all rails are present. Is that a correct assumption?

 

[G.Beard]

Aside from the liquid.... Have hou tried checking if the EFI is OK? Slap a donor chip on there ONLY to test that it will chime and show you boot menu for a while.
Had one similar the other day.

 

[dukefawks]

Echo chime is usually bad RAM. Could be corrupted BIOS but pretty sure it will be RAM and you don't want to fix that.

 

[G.Beard]

Echo chime is usually bad RAM. Could be corrupted BIOS but pretty sure it will be RAM and you don't want to fix that.

Bad RAM being the actual chips or possible the balls?

 

[dukefawks]

Could be chips, could be balls, could be traces, could be bias, could be the CPU. That's why you should not fix RAM issue really.