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Weird MK3 PCB problem.
Savannan:
This has happened since I owed the PCB.
When the PCB is cold (haven't been running for a day or so)..when I turn it on..the graphics are all messed up...but when I leave it on..it progressively gets better. About 30 mins with the PCB turned ON the graphics are fine...but once the PCB gets cold it acts up again....
The only thing I can think of is that there might be a bad solder point, and once it warms up it makes the necessary contact?????
Just wondering if anyone has seen this problem before with this game or similar.
Thanks
Sav
PS. During ROM check all the roms test GREEN
ctozzi:
could be a bad power supply in the cabinet as well, 90% of all cabinet issues stem from a bad power supply
Savannan:
Thanks for trying to help out but, I don't think its that. I have MK1, MK2 and MK4 using the same power supply and they all work FLAWLESSly....
Maybe this Sunday I'll take it to work and use a magnifying glass to see about solder points. I even took out the roms and re-inserted them ... :cry:
boardjunkie:
You use freeze spray to localize the problem area.
MonMotha:
Reseat all the socketed chips, not just the ROMs, while you're at it. Somewhere, there's probably a bum joint that works when things are warm as stuff expands.
Other possibility is power. Just because it works on many boards doesn't mean it'll work on them all. Check that it's right at 5.0V (4.9-5.1). If still in doubt, just replace the sucker; there are faults that can't easily be diagnosed with a typical meter. Quality replacements are like $25-35.
I'm not a fan of the freeze spray except as a last resort. That much thermal shock can easily cause additional problems by cracking joints.
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