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TI99/4a F18a install issues

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Hello all,

 

I finished an F18a upgrade for a customer's TI99/4a.  It works perfectly for about 10 or so minutes then it goes to a screen that says Matthey Haggarty dev screen and just starts blinking.  Sometimes with a tone, sometimes without one. 

 

Pulled the computer back apart to see if there's anything I missed or an electrolytic got installed backwards but everything looks fine.  F18a is installed into a machined pin socket on the board, not the stock one. The jumpers are set properly. I tried some different power supplies just to rule that out but ran into the same issue.  If I let it sit for a few minutes then I can turn it back on and it will work for a little bit and start doing the same thing again.  Almost like something is overheating but none of the other chips appear to be abnormally hot.

 

Anyone ever ran into something similar?

 

I've got an email in to Matt but I know he's super busy so I was hoping maybe someone here might know something or offer some help.  Thanks!

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Jim contacted me by email as this seems to be a board that I have built.  I would ask anyone who has problems with F18As that I have built to get in touch with me for support instead of asking Matthew Haggerty.  I don't have a diagnosis for this board yet, but I'll probably send out a replacement board and look at the faulty one once it is returned to me.

 

-Hans

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3 minutes ago, Hans23 said:

Jim contacted me by email as this seems to be a board that I have built.  I would ask anyone who has problems with F18As that I have built to get in touch with me for support instead of asking Matthew Haggerty.  I don't have a diagnosis for this board yet, but I'll probably send out a replacement board and look at the faulty one once it is returned to me.

 

-Hans

Yep, my mistake.  I didn't know that you sold the board until a little bit ago when the customer let me know.  We'll resolve this off Atari Age.  Thanks! :)

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Make sure the board is fully seated in the socket.  I pulled  up that screen when I first installed mine and discovered during the reassembly process, there had been enough movement that it wiggled a bit loose.  When I reseated it firmly, all was well.

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