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Check it with no cartridge inserted. Here's the pinout: https://www.jamma-nation-x.com/jammax/mvspinout.html

The power supply should have a dial on it. Read what @Darksoft said above about adjusting it little by little.

I think you can find several posts that say to adjust the voltage. If you search the thread you can find more information.

I did not write it down and they are all under heat shrink now. It should be easy enough to test with a volt meter.

I know. I have an original as well. I use it for CPS2 with minigun supergun. Logically, there is no reason to put that sticker there and assign -5v in the diagram to that pin unless it has been modified. I tested that power supply when I repurposed it (because I did not find it adequate for...

Perhaps it does now but my power supply definitely has -5v. This is an image of it. I believe I got one of the early ones.

It's modified to provide -5v I believe.

Can you share pictures of your boards?

You can do better than that pretty easily. Do you have flux? I recommend the grease style as it's easy to work with. Put the flux all over those pins where they are attached to the PCB and apply heat. Most of the solder will just straighten out on the pins. If any clumps pins together just...

Adding more positive feedback for @buenrip. Ordered Cowboys of Moo Mesa bootleg. It was shipping fast and packaged well. Communication was great.

I was just wondering how you had it setup, not recommending a setup. OSSC should all be the same in terms of functionality. They might use different quality components though. I would try this because it's inexpensive. https://a.co/d/a7bV1Lv

How is it plugged in when there are 5 cables for component and 6 for RGB/s? You plugged it into the component inputs and the also hooked the yellow to the composite input I'm guessing? Your have the TV input tuned to the composite input I would also guess. I'm no expert on this but I will...

And how do you have it hooked up right now? You can look into hd retrovision Genesis 2 component cables. They might work if the TV/monitor supports 240p. If they don't work with that TV you will need a scaler. The hd retrovision cable will let you connect to the scaler. The retrotink2x or...

What inputs are on that TV/monitor?

The display you are using supports RGB/s?

What MVS are you using? Do you happen to have an mv1b? I'm curious why my carts just don't work on multiple mv1b.

I opened a thread for cart issues. Mine go to crosshatch often.

That s1 ROM doesn't need pins 2/24 swapped?

I still don't understand why the cart doesn't work in any mv1b. I don't even get crosshatch. I get flashing screen like no bios. I might have to open another thread to focus on that issue and what could cause it.

Thanks. I've been leaning in that direction. The carts should be clean by now. I have really worked on them and I'm not seeing any black come up on the swab when using de-oxit. Both games can be played to the end, even in the shells; so I think they are assembled well. The carts are sensitive...