So replacing these did nothing. Basically nothing I've done to this point has made any improvement.
Ok, given these all check out fine, then it might be the 245/347 chips that @zenomorp had mentioned in his video.
I already reflowed mine, but the 245 chips at U39 & U17 got a lot of corrosion on their legs, and possibly inside the chip:
View attachment 802649View attachment 802648
Especially U39, being directly tied to the reading of the program code might need to be replaced. I have some on order.



