(Topic ID: 277865)

need help with x's and o's motherboard repair.


By tonycip

7 months ago

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Topic Stats

  • 11 posts
  • 5 Pinsiders participating
  • Latest reply 6 months ago by sneakerpin
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#1 7 months ago

Hi I'm trying to fix this machine for a friend .I'm more familiar with wpc era games. so any help would be appreciated , I have an mpu board with acid damage.
and led steady on. machine wont boot gi is fine. I would like to bench test it. but I don't know what needs to be powered up to allow it to fire up.
is it just 5v? or do I need others ?. I know I could buy a replacement allteck board. but It seems like a good learning exercise. thanks
bally mpu as-2518-35

#2 7 months ago

https://www.pinwiki.com/wiki/index.php?title=Bally/Stern#MPU_boot_issues

Also there are alternates to alltek that are cheaper, weebly board $153, people selling working originals $70-$100

You need 5v to boot it at least to the sixth flash.... pinwiki link will walk you through issues front to back

#3 7 months ago

You also need 12v to light the led.

#4 7 months ago

TP2- 12v
TP5- 5v
TP4- gnd

#5 7 months ago

Thanks for the fast replies and the links. I will report back soon

#6 6 months ago

Here's the update. First that pinwiki is really through. I removed the rotten battery. And tried to neutralize the acid by scrubibg the board with backing soda. Then I checked some continuity and found there was none on chip u11. So I removed it and sure enough it was corroded. So I replaced the socket and cleaned the chip. Board is now blinking as it should. Ill be trying it in the machine tomorrow.
Now can someone tell me how to put the machine on free play. Thanks

#7 6 months ago

I don't think you can unless you "upgrade" to an Altek or other after market board. The easiest solution (One that doesn't require modifications) is to set a free game to the lowest possible points in settings. That way, you are pretty much assured that you will win a game, so there will always be a credit.

#8 6 months ago
Quoted from tonycip:

Now can someone tell me how to put the machine on free play.

http://www.pinball4you.ch/okaegi/pro_soft.html midway down the page is a freeplay patch for the software.

Early Bally's need a software change to do so, no stock setting. You can get roms burnt by most of the places that do so and put them in your mpu board. Weebly and alltek both have this integrated into their all in one boards.

#9 6 months ago

Thanks i put the board in and it now boots. But the coin door and start switch still didn't work. After close inspection the j3 on the mpu harness plug is corroded. And will need to be replaced. Im not sure of the size of that plug. Are they .156? They look smaller.. on the free game front it looks like someone wired in a switch to act as the coin switch. Thanks again.

#10 6 months ago

They are .100

#11 6 months ago

If you are a purist, you could wire a leaf switch in parallel with one of the credit switches and mount the new leaf so it can be triggered by the coin reject mechanism. Someone ruined my Playboy coin door by drilling a button for credits, ugh.

I have an X's and O's myself. Rare game these days. I enjoy mine, even if the ruleset never makes sense to me!

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