CPS1 Graphics issue Street Fighter 2

[wolffworkshop]

Hi, can anyone help me identify the graphic issue I have on this board? It breaks up on multiple sprites.

 

[Thrillhouse]

Looks similar to the C board issues that @undamned is working to provide a fix for. I have similar sprite issues on a Willow boardset that several folks on the forum seem to think is a C board issue.

That said, if you're comfortable with it, it wouldn't be a bad idea to verify voltages (off the PSU, at the JAMMA connector, and at a few chips), reseat the connectors between each board, and it might help to reseat the ROMs on the B board. Again, though, it looks very similar to the symptoms of a failing C board.

 

[pacoarcade]

I'd try to gently press the CPS-B-21 chip (without touching its legs) while the board is running to check if that solves or modifies the behavior. Sometimes the solder joints get cracked and need to be resoldered.

 

[wolffworkshop]

Thanks for your suggestions. I also have a SF2WW which has a non functioning A board for whatever reason. When I put this A board on it it all works but shows very similar issues to this SF2CE. That makes me think I have a currently dead A board and a currently dodgy A board.

 

[xodaraP]

It could well be an A board fault, if possible though it's worth verifying the mask ROMs. They're a common failure on SF2.

If you get the same fault on both B+C combinations, that's less likely but still possible

 

[wolffworkshop]

What kit would I need to verify the roms?

 

[wolffworkshop]

I'd try to gently press the CPS-B-21 chip (without touching its legs) while the board is running to check if that solves or modifies the behavior. Sometimes the solder joints get cracked and need to be resoldered.

I have a set of IDC cables that will let me put the A board on top too so I can have a fiddle. I’m just getting started in the fiddling with boards etc.