So I removed the logic board from my dead disk and I see there appears to be a problem.

Seems to be a diode that failed, next to the 12V line

Based on this photo, I agree with you, now, I’m not good at repairing boards, kind of clumsy with the tools.

I have see a lot of users getting help from fzabkar.

Try to contact him, he might be able to help you.

The disk board now causes fail to boot, suggesting the diode is toast.

I wonder if removing it and shorting the pads will work?

ask fzabkar.  he’s the electronics genius around here.