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Hi everyone, @rewrite and I figured out the problem! The missing diodes weren't the issue, it was the Mistercade top plate! For whatever reason, it was shorting the B button, for the time being, I will just leave it disconnected. Thank you everyone for all of your help!

When the seller originally sent it to me, I realized something was wrong when testing so I asked them immediately. They claimed nothing had been done with it whatsoever and they were selling their cab, clearly, that isn't the case. I'd totally be down to Ship it to you, pay you, and pay for...

Got this from someone who showed it being tested, guess they must have screwed it up pretty badly and tricked me. I would never attempt to mess with the Mistercade / as PCB as I wouldn't want to damage it. Looks like I'm out a pretty big chunk then which is my fault. I can attempt to get a...

I'll upload pics of it attached to the Jamma shortly.

Have Chamma set to: Off I also have the Mistercade V1.2 so its a little different.

Hey Rewrite, yes I can do that give me some time and I'll send the picture over, what could be wrong with the Mistercade? Maybe the edge is damaged?

Alright, everyone, I've come back with an update @rewrite @nem @AlxUnderBase I tested the pins with the Mistercade connected and everything running, here are the results: 5V Pin: 5.06V 12V Pin: 12.33V Thank you all for your continued patience with a new member such as myself. Hopefully, we...

I also watched @Epyc videos showing how they had their Mistercade hooked up as well, which is exactly what I did. Video here: View: https://www.youtube.com/shorts/Myw6rONY7X8

Makes sense. I 100% did not plug it in backwards. I made sure the "UPSIDE" on my Jamma Connector was shown before plugging it and verified that it was correct before turning it on by discussing with other Capcom Minicute Repro owners who went the Mistercade route.

No problem, will grab a Key for sure. If you plug it in backwards I assume it will short the board correct?

Hey Nem, yeah I never plugged it in backwards, but this is a great thing to note. If you plug in a PCB the wrong way, would it impact the PCB or the Jamma?

Perfect, will make sure my PSU has the correct voltage and report back here tomorrow after testing the Jamma. As far as I know, it should be set to 5V. Thank you again for the video, greatly appreciate everyone's help!

Thank you, this makes sense now. I was looking at it on my harness and it showed 1-6 on the left, but I know for a fact that pin 6 on my harness involves the P1 and P2 button 2. Should I first test this without the Mistercade connected and then plug the Mistercade in and test it again? I know...

Here is Hursit's, maybe I'm just not able to identify them properly lol, I'm sorry.

Hey @rewrite, when looking online at the standard Jamma layout, the wires on this don't seem to match, does something look off to you? - Trying to determine the 5V and 12V pins as well as grounds.

May be a stupid question, but I am testing this with the Mistercade still plugged in correct? Also, going to have to test tomorrow unfortunately, I need another hand and that person is now asleep haha.

Have to take care of something real fast but I can test in an hour or so, thank you very much for the picture, will test the 5V and the 12V!

Thank you very much for your help, I need to remove the heat shrink around these pins in order to test correct? I will do this now and report back.

Alright, everyone, I have some updates... I took my multimeter and set it to continuity with the cab turned on. I touched the b2 color wire spade with the red probe and the ground wire spade with the black probe. When set to continuity, my multimeter shows a number of "1." When touching the two...

Hey how's it going, I did the first part of this and took the ground from a working button and swapped it to the "b button" that wasn't working, this lead to the same result of the b button not working. When I get home tonight I will do what rewrite stated previously and also check the...