I have a Stern Nine Ball that works fine when it's working.

The mpu board shows rework (battery corrosion) and some of it is not pretty but it boots and works fine...

If I leave the machine on for about 30 minutes or so the displays will start freaking out and eventually the attract mode will quit.

The game will work properly for hours with an alltek in it so it has to be the MPU. Could also be power if the alltek is more power tolerant (not sure about that).

Any ideas how to isolate and identify this issue?

Thanks