My Dot Matrix Controller board in my BSD has a RAM error. I have the typical garbage bits on the DMD. If I run the display test I get a RAM Fail message. I left the machine on and the display cleared up and ran the test again and everything passed. 10 minutes later it went back to garbage. Is there a good way to test and know which RAM chip went bad. I've seen others mention one of the 74SL175N flip flop's go bad and replacing them fixed it.

Any ideas on how to track this down or should I just buy a new board?

thanks

Thanks for the tip. I will try replacing U24.

Thanks all. I found the U24 6264 chip on ebay.

I forgot to update on the situation.

I replaced the 6264 chip and the issue is still there. Running the display test I still get a RAM fail message.

After replacing the 6264 chip the display looks better, not as much garbage. I am going to swap boards with a working one and see if anything follows/stays the same. I will update this post so if anyone else is having the issue can follow along.