Wizard of War - No video to monitor

smass

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I am finally getting back to troubleshooting my Wizard of Wor. I started a thread back in June of 2017 on the general discussion forum that can be found here :

https://forums.arcade-museum.com/showthread.php?t=405706

This was my first arcade purchase. When I bought the machine it was in all original condition. I initially had no power so I upgraded to a new switching power supply. Once that was installed the machine booted up. All sounds work, and the game coins up and plays blind. The monitor has a white picture on it and at first I suspected the monitor needed work. I re-seated all the boards and checked all the connections to the monitor. Then I gave up on it for a bit...

Fast forward to today. I have a CGA to VGA adapter board and today I spliced it into the output from the RGB Interface PCB. Same symptom, no signal to the VGA monitor. Then I took a known working K4900 monitor I have and connected that. Same white picture. The game still plays blind and none of the three monitors I have connected seem to be getting a video signal.

Is it possible that the RGB interface board is bad? Is this a common part to fail? Is there a cap kit available for this little board? Any other ideas? Thanks. :)
 
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Is there a way to test to see if a video signal is coming form the main pcb? If I could test that I could determine if the RGB interface is or isn't receiving a signal.
 
I've not done it before, so I can't tell you what you should see, but you can measure the voltage on pins 7, 9 & 11 of J2 going into the board (12 pin connector) to see if there is any signal. Pins 1/8/10/12 are GND. You may also want to check the input voltages- pins 2/3 should be 12v, 4 should be -5v and 5 is +5v.
 
Easy to check if you have a scope. Not so easy without one. I would verify those supply voltages first. Especially since you changed the PS. I have a manual if you need it.
 
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