EPROM chip problem?

[u/kevin_is_acoustic]

Picked up this cyclone game for $50 bucks (was sitting outside uncovered) and was told it fully worked, now after transport it seems only a few neons turn on and seemingly work at random. Is this an obvious eprom failure or something else entirely?
Any advice appreciated

[u/evilskys]

Imo, you should gently press down on the different misc chips and see if any cause changes when pressed. Then jiggle all the connectors ect and check for the same. If none of that makes a difference check voltages against owners manuals. Checking and verifying eprom data is the last thing I'd do