Unsure, I was pretty careful but definitely screwed something up
It wouldn't play anything and it replaced all the album art with random noise, restored the firmware and disconnected/reconnected everything, couldn't get it to work. Thought it might have been the mSATA adapter but it's working fine with the new board.
I actually bought a used 5.5g 30GB because it was cheaper than I could find the logic board on its own, and for the hell of it I reassembled the 30GB one with the old board inside... it worked fine! Was pissed off because I thought I just wasted $40, but I put the old board back in my ipod and it stopped working again, so that royally confused me. Shame it was a 30GB so it didn't fit together, if it was 80GB I could have put together a second working ipod with the leftover parts and sold it to someone.