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Museum of the Game® & International Arcade Museum® Forums
I picked up a DKjr cab that had a poor attempt at being converted to Karate Champ. The previous owner showed a distorted image on screen but you can make out the game. Also there were no colors…just grey.
I recapped the monitor and replace the B+. I also replaced the video input harness because that was hacked into.
On the test bench, I get good neck glow and constant scrolling lines with my TPG. I was able to get a partial image for a short period of time adjusting the vertical hold. Also no colors, just grey.
Comparing this monitor to a known working monitor, I noticed it was missing the single wire going from the main chassis to the three pin header on the inverter board. Looking at the chassis of the problem monitor, the through hole were the wire would have gone is soldered over like it was not meant to be there. I don't know if all of these monitors need that connection or not. Aside from that, I don't see any other physical problems.