Friday, September 24, 2010

MM and AFM cpu problems

A few months ago I had a problem with my MM. Suddenly it started to reset, hang, didn't boot, .. all kinds of weird problems :(

I had recently installed a new gamerom (the latest version, ordered from ). But it started correct, to be sure I tried my original gameroom in it too, no difference, same weird behavior.

When I pushed in the connector at the right side (delivering +5v power) it had some effect. Sometimes the game didn't boot at all, when I played with that connector it did start. Weird..
Played a bit more with it, switched the cpuboard with that of my Attack from Mars.
Suddenly the problem was gone ? MM booted correct, AFM also.
I was happy as it was just a few days before I had a pinball party, so I really wanted these two games to be working and didn't have time to investigate (or order parts).

It's a good thing I write down here some repairs I do, as I had forgotten that I had problems with these cpus one year ago. But here in my blog I found a post about it, AFM then had weird problems and I finally switched the cpu board with that of MM and the problems were solved ?

So now the boards are in their original games again.

I've been testing a bit more with the cpu board and I think somewhere there's a bad connection on the board. It's not the connector itself as I first suspected, but it's somewhere on the middle right side of the board, because if I tighten the screws a bit more or less the cpu also gets problems.

I didn't have a tool to extract an asic so I couldn't rule that out as a solution.

Now I've finally ordered one from
dealextreme, but I haven't used it yet. (as the cpu works fine in AFM and I go by the 'don't fix it if it ain't broken' motto..)
When I have some time I'll extract the asic from the board, put it back in, and play a bit with the board to see if it always boots..

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