Sega-Naomi

What causes a Dimm Board to die? I swapped out my HOTD 2 mobo with a GD Setup and it worked flawlessly for a few hours in my HOTD 2 dedicated cab. Powered off the cab came back the next day and I started getting an error 22. I swapped GD drives, same error, swapped Dimm Boards and it works. I even used the Dimm in another cab, and I receive the error 22. So it's definitely dead and I am wondering if there was something that I possibly did that would have killed it. Could the HOTD 2 cab power supply possibly done anything to the Dimm board? Any thoughts?



Thanks!

in the naomi test menu, there is a "dimm-board test"

you can try this to see the result...

Have you tried opening the dimm module to reseat the daughterboard and memory sticks?

I tried both. It just times out on the test like it does not even detect the board.

That's bad news.:smt009 Unless something else is loose, or some pin is bent, it's probably dead. I have a dead one and it acts just like that. I have yet to find what exactly is wrong with it.

opening the dimm module to reseat the daughterboard and memory sticks?

do you have pic to show how it look like ? or how to do this reseat ?

what is the benefit of this reseat ?

Merovingian wrote:do you have pic to show how it look like ? or how to do this reseat ?

what is the benefit of this reseat ?

Inside the Dimm module is a pair of ram sticks and a smaller board attached to the main dimm board. Sometimes they come loose and cause errors. Reseating these components is the first troubleshooting step to eliminate loose parts as a possible cause of errors. There is no need for pics since taking apart the module is super easy. Try it, you might learn something.

no thanks, my dimm work good !!



it s just for people who are reading this post and hesitate to ask this question...



so i ask for them

Thanks for asking the question Merovingian. When I first read the post, I wasn't sure, but when I took the board apart, I guessed that's what he was talking about and those were the items are worked with. Glad to know I did it right!

I've got a non-working 3.17 Net dimmboard too.



With my other (non-net) dimmboard the boot sequence goes like this :

1 - the screen is a deep black for 2-3 seconds, as if there were no video signal

2 - the screen becomes a lighter black

3 - then rapidly it fades in to white with the Naomi logo, and starts checking memory etc.



The faulty one seems to prevent my Naomis from booting correctly.

I don't have any error message, the screen just stays blank :

- with my Naomi 2 mobo, I have step 1 above for about 7-8 seconds, then it seems to flicker with the lighter black from step 2, then goes back to 1

- with my Naomi 1, it stays at step 1



I've tried reseating the dimms and daughterboard too, but it did not improve anything...



Any other ideas ?