I've been working with a Mario Bros. cab recently, and just got done replacing the audio chip and recapping the monitor. Everything was working perfectly. Today I turned it on and it makes the regular squawk when you turn it on, but there's no video and it doesn't advance the counter when you put in a coin. It doesn't have a white screen... it just looks like the monitor is on with no input. This happened once before, but I checked the wiring harness and all the molex-type connectors from the front of the cab, and then it turned back on just fine. Is there a power LED on the board? I don't see anything when I turn it on. Could it be a voltage issue? A wiring harness issue? Any ideas where I should check?
