Adding new 19" chassis CR-31 (fat neck) for sale: $250 shipped. Same as others, new caps, new Arcadepartsandrepair flyback. Full reflow and rebuild, working 100%
Talk to @sheep_nova, he was able to get me a couple of original A boards with original audio sections. Alternatively you can find a dead A board and transplant the audio section, which is what I did for one of mine.
If it's the @GadgetFreak hack, I believe it will accept any B chip. That being said I know the C-boards themselves have different configurations, so swapping the chip itself may not work. You can still pickup C boards from @sheep_nova I believe.
Hey there, rather than copy/pasting everything here, I’m working on dead revolution X PCB, I’d appreciate any help if someone has ideas:
https://forums.arcade-museum.com/threads/revolution-x-cap-leak-o-rama.547378/
I'm swimming in K7000s right now. I rebuild with Nichicon/Panasonic caps and re-flow/reinforce in the common failure areas, such as R101, 89, etc.
Reliability of aftermarket flybacks is debatable, so I leave orignals alone if working. If they have minor cracking I seal them with Corona dope...
MVS boards are very common. You'll never find someone willing to repair for less than just buying a new one. If you don't have the ability or connections, I would just sell yours as is and use the funds towards buying working ones.
I worked on a similar project
https://www.arcade-projects.com/threads/fixed-chinese-hack-forgotten-worlds-conversion-audio-broken.24020/#post-362552
My solution was to just replace everything from a donor board and it worked fine.