After the holidays and some travel (so long period off) I turned on NGG that had been working perfectly and it is doing all kinds of random stuff now.
Initially, the CPU board was diagnostic LED'ing a problem with the RAM (anypin DMD+ NVRAM) while simultaneously the audio board was beeping 3 beeps which is a sound ROM issue. Re seating all the connectors didn't do much.
Last night I got new NVRAM and new Sound Roms in and replaced them. Now i'm getting, repeatable at least, symptoms such as the follows:
- If the machine's been off long enough to discharge the caps (30 min or so), the game will come up correctly and DMD will be fine.
- After 30-90 seconds the DMD will start to get garbled; was perfect before that.
- Along with the progressive DMD deterioration, if i wait long enough, random solenoids will fire (like a flipper or something) very briefly.. almost like a ball search but it's not a ball search at all.. just similar random pulses.
- If I turn it on / off again it will just come up garbled vs start good
Any thoughts? I assume something is failing in the power system? Not even sure where to start with walking though weirdo power issues.