MegaST recent errors

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Bikerbob
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MegaST recent errors

Post by Bikerbob »

Hello all, I have a megaST board that I have been using as my project board over the years. Trying to get my PAK030 working etc.

I am sure this is a result of me playing with the board so much.. but I am having an issue, where when the board is COMPLETELY COLD - not run for hours.. it will book fine.. and work for about 2-3mins.. then the screen starts artifacting and flashing.

I was just trying this with the diag cart.. and got these screen shots.. The last one showing 1m of ram was interesting as the machine has 4m.
20211027_122843.jpg
Does R2 refer to a specific Chip? a Row?
20211027_122903.jpg
20211027_122853.jpg
Does this give anyone an idea where to look?? after the first bunch.. I disconnected everything from the board - turned it over and went over the ram sockets (ALL are socketed) - touched up anything that looked suspect, but I ended up with the same type of crash.. which is the last picture.

Open to suggestions?
20211027_132656.jpg
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