I lose an entire row of the lamp matrix at times. Sometimes when I turn the game on these lights work, sometimes they flash intermittently (together), and sometimes, most of the time they just don't work, or go out after a short time. But they always ALL go out together.

I'm thinking its the Q transistor associated with that row? Is that typical behavior for a failing transistor?

Other thoughts? How to test transistor?

As an update, it seems the longer I leave the machine powered OFF, the more likely the lights will work for a few minutes once turned off... sometime failing due to heat? and it cools off over an hour then works?

Do you mean the Q transistor solder joint or the lamp matrix connector?

I'll look at the joints...

But I don't think that's it... it's almost scientific! I turn the game off for 30 mins, turn it on, they work for 5-10 minutes, begin to flicker and they're out. The entire row does the same thing exactly at the same time.

Sometimes they will come back after a few minutes and flicker.

It has to do with heat, or a failing electronic component. Solder joints/connectivity wouldn't have this repeatable, flicker effect... I don't believe?

Thanks for your thoughts.

Thanks, I will.

I just need to know if we're talking the CPU where the Q is, or the interconnect board... or maybe both? I don't think you meant the Aux Driver board?

Where would you start?

Bad connection at the interconnect board. Fixed it.

Now on to the NEXT set of problems...