FS Capcom CPS2 New Old Stock Components

[ForestOfDreams]

Just throwing this out there. If all the chips look good, is there any easy way to diagnose which one has failed?
I have intermittent sprites on a parts board.
Other parts boards have various issues but not acid damage.

 

[BMan7418]

Bump.

I'm starting to run out of chips now, if anyone is willing to do a group buy for any CPS1/2/3 chip, give me a PM and hopefully we could work something out.

Sure

 

[BMan7418]

No easy way, you have to compare each pin with a Known good one.

 

[evan1]

Just throwing this out there. If all the chips look good, is there any easy way to diagnose which one has failed?
I have intermittent sprites on a parts board.
Other parts boards have various issues but not acid damage.

You would need to study how the CPS2 works. I haven't spent enough time studying in detail in these boards work outside of a very high-level perspective, so I wouldn't be able to help unfortunately. A lot of these tile-based systems work in a similar fashion so it's easy to get an intuition that way.

But there are a lot of resources to help you:

There are schematics and block diagrams here: https://gitlab.com/loic.petit/cps2-reverse

It's possible that there is a bad trace that carries data for the sprite graphics.

Here is a CPS2 tester that tests the memory you could try, in addition to the in-built memory tester in the service menu for games: https://cps2shock.emu-france.info/download.html

 

[evan1]

Bump