Have you tested the four big diodes?
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Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

Send your sound board out for repair. Send the MPU along with it to have NVRAM installed.

I can take care of both if you would like.
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Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

No worries...and thanks for posting the text of the sections I wrote for the PInWiki. I’m glad that people are finding those useful.

You surely wouldn’t be surprised by the number of people who ask for help but really don’t have the capability to use the information correctly.
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Chris Hibler - CARGPB #31
Http://chrishiblerpinball.com/contact
http://www.PinWiki.com/ - The new place for pinball repair info

Radial and Axial caps are functionally identical. They differ only in physical lead placement.
I looked back at the pics. C28, normally a tantalum cap, has been replaced with an electrolytic. That's fine.
What might not be fine is the carbon residue/burn that remains. Carbon is conductive. Use your ohm meter to see if the legs of that cap are shorted to adjacent parts via the carbon.
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Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info

The cap was probably installed backwards, reversed polarity. When this happens, everything seems normal, then you begin to hear a sizzle, then the cap explodes spewing insulator and electrolyte. Clean off the board with iso alcohol or Castrol super clean to make sure the electrolyte is removed. It is conductive and can cause other issues.

How long does it take an electrolytic cap to explode? That is dependent on the voltage applied, capacitance and size of the cap.

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Chris Hibler - CARGPB #31
http://www.ChrisHiblerPinball.com/Contact
http://www.PinWiki.com - The Place to go for Pinball Repair Info