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Ok, perhaps I have enough information to be dangerous... On the CPU board of an Atari System 2 there are test 'holes' for +15vdc and -15vdc, having some telco experience when I measured 30vdc across both pins I assumed that to be correct since the delta between -15 and +15 is 30. After digging...

Super Sprint Power up checker board then black screen I bought a super sprint that originally booted up and I could hear the game play, the monitor needed a fly-back and cap kit. I got the monitor repaired and now the game does not fully 'boot up'. The monitor displays a checkerboard then...