I've bought this board knowing it has issues with sprites. According to the seller the sprites were missing. I've fixed the missing sprite issue. It was actually a sprite - background priority issue (sprites were drawn "behind" the background tiles) and the culprit was a physical damage on one of the legs of the 053251 custom chip.
Anyway, the game is now playable without any obvious issues.
... then I noticed some of the graphics has color glitches...
The color chart on the test menu shows this...
I've checked the palette RAMs out of circuit, they checked out OK. Also the MASK rom tests checked out OK (Although how reliable those self-tests on these Konami boards are debatable).
What might me the problem?
Anyway, the game is now playable without any obvious issues.
... then I noticed some of the graphics has color glitches...
The color chart on the test menu shows this...
I've checked the palette RAMs out of circuit, they checked out OK. Also the MASK rom tests checked out OK (Although how reliable those self-tests on these Konami boards are debatable).
What might me the problem?