RAM ERROR Street vs X-Men

[josineyf012]

Hi, I'm not sure if this is the right place to ask, but I'm having an issue with a Street Fighter vs X-Men arcade board. It's showing a "RAM ERROR" message and then the screen turns white. I already tested board A and it's working fine, so the problem seems to be with board B. I followed a video about the issue.

View: https://www.youtube.com/shorts/uzD9zNEbT4A

 

[Wall-Garants]

Hi, I'm not sure if this is the right place to ask, but I'm having an issue with a Street Fighter vs X-Men arcade board. It's showing a "RAM ERROR" message and then the screen turns white. I already tested board A and it's working fine, so the problem seems to be with board B. I followed a video about the issue.

View: https://www.youtube.com/shorts/uzD9zNEbT4A

I replied in your video friend

 

[josineyf012]

Hi, has anyone ever been through this?

View: https://www.youtube.com/shorts/LmhsnsMV_Ew

 

[l_oliveira]

Put the original RAM chips back. That may solve the glitches. The issue was the TTL IC below and you already solved it. The "new" ram might be the glitches cause.
Poe a ram original de volta. O problema era o CI TTL em baixo e vc ja resolveu. A nova ram pode estar causando os glitches.

 

[josineyf012]

Hi! I did what you suggested, but the RAM error came back. So I started testing each memory chip one by one on the board and was able to identify which one was causing the issue. I found out that one of the MB8464R-10L memory chips and also the 74LS373 were faulty.

After putting the working memory chips back on the board, it booted up, but there were still glitches. I believe the issue is still with the LS373, probably because it's of questionable origin and its package is quite different from the original one. The LS373 I got is physically larger than the one originally on the board. There was just enough space to solder it, but the pads were right at the edge.
I don't think the size is really the problem, but I'm going to try to find the exact same model as the one that was originally on the board to replace it.

Thanks again for your help — I really appreciate it!