(Topic ID: 191404)

Gottlieb system 80 mpu corrosion


By ddd

3 years ago



Topic Stats

  • 8 posts
  • 6 Pinsiders participating
  • Latest reply 3 years ago by vid1900
  • Topic is favorited by 1 Pinsider

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There have been 3 images uploaded to this topic. (View topic image gallery).

gottlieb_battery_damage (resized).jpg
black hole corrosion back (resized).JPG
black hole corrosion front (resized).JPG

#1 3 years ago

This is my parents' pin, it's been sitting in their basement for a long time. I don't know the repair history other than they've had a tech work on it in the past and it's hasn't been working (or turned on) for 7 or 8 years.

I opened it up to check for damage and sure enough there is some corrosion around the battery.

However I don't see anything leaking out of the battery. Maybe it leaked in the past and this is a botched repair job. (Possibly from whoever scratched the board around this area.)

Does that seem likely from the photos or could this somehow be a slow leak from the current capacitor that I can't see?

Does this board seem salvageable or is it a lost cause? I don't mind a bit of a challenge but if it sounds like a quarter of the board needs trace repair that's probably a bit much for me.

black hole corrosion front (resized).JPG

black hole corrosion back (resized).JPG

#2 3 years ago

At a glance, the corrosion doesn't look too bad, certainly salvageable for sure.

#3 3 years ago

That doesn't look too bad. There are kits available to replace all the affected components. It does look like a half arsed repair though. Someone has sanded the affected traces but it doesn't look like they've neutralised the battery alkali so the corrosion continues.

In any case I would get that replacement battery off and mount a remote battery holder.

#4 3 years ago

Thanks! I will give repair a shot.

#5 3 years ago

Someone has globed solder on the edge connector contact points. That may cause problems. I would try to smooth it out.

#6 3 years ago

Basically the bottom left corner of the board will need to be cleaned up. Also remove the switches since there is likely corrosion under them.

https://pinside.com/pinball/forum/topic/terrybs-guide-to-repairing-alkaline-battery-damage

gottlieb_battery_damage (resized).jpg

#7 3 years ago

There also appears to be a broken trace on the 5th contact from the right.

#8 3 years ago

It all looks fixable.

Make sure you read this before you begin:

https://pinside.com/pinball/forum/topic/stripping-battery-corrosion-with-a-strong-acid

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