My friend Silvio kindly donated me a couple of faulty boards, this ‘Captain America and the Avengers’ was one of them:
I was expecting some boot troubles but when I fired up it I got this:
All was OK except for sprites that were all missing.Since I already worked in the past on similar Data East hardware I knew that sprites are generated by some ASIC, in particular the one marked ‘DATA EAST 52’:
Infact, when I firmly pressed this ASIC, sprites were restored.Proving the tightness of the individual pins with a needle as I usually do confirmed that some pins were lifted.So time was to do a reflow of this chip and this was enough to fix the board completely.
Thanks again, Silvio!