Archived from groups: rec.games.video.arcade.collecting (
More info?)
mudmantim wrote:
> The story:
> I won the game, went to get the game, got it home and it worked
> everytime it was turned on. (I know we shouldn't, but we leave our
> games on, pretty much, all the time.) Well, after about a week or so,
> we got up and it was garbage. The games I get for me never fail, the
> ones we get for her ALWAYS fail. And that is how it became the way it
> is. The previous owner told me that it never did this as long as he
> owned it, and I believe him. He's a good guy.
> It has a switching power supply hooked up also. I replaced that one
> with 2 new ones and I get the same thing.
> I have reseated the ROMs twice, once just taken them out and put back
> and the other time rubbing them with a pencil eraser.
> I am not the smartest when it comes to checking stuff, but I will do my
> best to check for the AC ripple on the gameboard. I check the RAM
> chips correct? Is there a idiots guide to doing this somewhere?
> As soon as I get my parts delivered I will dig out the game and start
> checking it out.
> Thanks for all the help Bret.
>
You can check for AC ripple anywhere.
Check the voltages at the chips themselves or at test points on the gameboard.
If checking at the chip, make sure that you don't short any pins when testing
w/ the probe tip.
I'm starting to suspect that you have oxidized wiring/connectors and/or a
bad/dying filter board like you suspected. You should be able to narrow it
down by checking the voltages, or similarly checking resistance between points
(check voltages w/ game on, check resistance w/ game off & unplugged). 3 ohms
is the max resistance that you should see between source and sink, more than
that will be a problem.