Namco System 256 - Display issues

Dreygor

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So I acquired a Namco System 256 with Tekken 5 Dark Resurrection and it worked fine for a few days with no issues. It was a full pull from a dedicated machine (got card reader and wiring, ps2 control*harness, power supply*.. everything). Over the course of two days the video started getting dimmer and dimmer like someone was turning down the brightness until it reached it's current state in which no video is showing at all.

I have tried 4 different LCD monitors, 2 flat panel TVs, a CRT monitor, and an CRT to VGA converter going to a LCD monitor adjusting the dip switches to match the configuration. I checked the voltage coming from the power supply with a multimeter and the leads read a steady +5 VDC and +12 VDC respectively. I ordered a new power supply just in case (will be here weds). I totally dismantled the unit and inspected the motherboard under a magnifying glass and did not see any visible lifted feet, bad solder points, bad traces or burnt spots. The odd thing is all of the monitors change their display while the game is booting as if the 256 is out-putting video to them but the screen is black.

When I boot the game I can hear the normal beeps, then it says good morning, I can hear the game playing, I can even hear it when I start the game and listen to it play. So the rest seems to work fine.

I am at a loss and seeking help from the gurus here.
 
Definitely sounds like a power issue but you might want to check if you get video from the vga outputs first if you do then there is something wrong with jamma I/O board. I had a similar issue with a system 246 and was resolved when I connected it to a higher wattage ATX power supply. Its weird too because I had a system 256 with Tekken 5 that worked with the lower wattage power supply. Just like the naomi these system are finicky with power supplies.
 
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