Wish I knew. Seems unlikely that it would be damage from battery corrosion, since the battery is so far away from the board, and the part of the board that would be near the CPU is the opposite of where the corrosion is.

I guess it's possible that a battery could have exploded on it? Or that it got wet, or was in high humidity?

I picked out another driver today.


Stripped the caps, bridges, a couple burnt connectors and a bad fuse holder off the board


Cleaned all the boards, then rinsed in alcohol, dried with the air compressor, and will let them hang for a few days in case there's any residual alcohol in there that I missed.



Cleaned the rest of the boards, and they are hanging and drying, too. I usually lay them in the hot sun for an afternoon as part of this process, but the weather here in November isn't good enough to do that - so I'll do what I can.



Really would like to start rebuilding the boards tonight, but I think they need to dry a bit longer, so maybe I'll just clean up the shop tonight. Or maybe my BAA and Pinball Life orders will roll in today, and I'll have some parts to work with!