Speaking of which, I've recently finished repairing 3x 4 slot MVS boards.
These have all had completed:
- Proper cleaning
- RAM replaced where required
- Fast video RAM socketed
- Coin cell battery holders
- Rechargeable CR2032 batteries installed
- Any faults have been diagnosed and repaired
All are currently running on factory BIOS but I'm happy to burn a UniBIOS for any of them. I haven't recapped them because the sound is loud and clear, but if you buy one and want it recapped, happy to do it.
2 of these also have a missing tab on the 5v rail on the edge connector (burnt off due to voltage overload, probably what killed the RAM). I have cleaned these up but not replaced it with copper tape because I feel it's cleaner that way, happy to put copper tape down if that's what you want.
Pictures and videos can be supplied, all of these have had a 1 hour burn in with all slots in use. Happy to make a new video with any 4 games in my collection if there is a game you want to confirm works correctly.