Not sure what you're doing to test, but here's what I do:

With the gameboy off, plug in your keyboard.
Turn the gameboy on, verify the keyboard has power (usually the scroll lock keys flash on boot)
Open the LSDJ song
Go into the settings, and toggle keyboard sync off then back on
Go back to the song screen
Just the arrow keys to verify you can move the cursor around

Well, I don't think usb > PS/2 keyboard adapters will work at all with this. You need a true PS/2 keyboard. I'm foggy here, but there is something to do with those adapters not actually converting it correctly to true PS/2. Similarly, it seems like some modern keyboards internally use a usb to PS/2 adapter. I'm super foggy here, but for sure I'd try to track down a true PS/2 keyboard and see what happens.

Power issues could very likely be an issue if the DMG is backlit as well. I know some DMGs have power issues with backlighting alone. That, said, my DMG is backlit and works fine with a PS/2 keyboard, but I have no idea what kind of power the VGA adapter draws.

Thanks again for the response! I will try more true ps/2 keyboards. The thing that confuses me the most is that I've gotten it to randomly work with my current set up. This is not backlit and I've tried removing the porchie board- which didn't do anything unfortunately.

I replaced the batteries for a fresh pair and it worked with no problem at all. I then turned off my Gameboy, turned it back on, and the keyboard stopped working. Going back to the spamming F4 note. This happened to me once before too, except that it stopped working without me turning off the Gameboy (I was pressing a bunch of keyboard notes successfully, when it stopped working and started spamming F4)

Power issues could very likely be an issue if the DMG is backlit as well. I know some DMGs have power issues with backlighting alone. That, said, my DMG is backlit and works fine with a PS/2 keyboard, but I have no idea what kind of power the VGA adapter draws.

Try a different keyboard!

I have! I've tried using a couple of USB keyboard and a USB > PS/2 adapter, with the same result. I saw videos of people using the exact keyboard I have- so I'd like to say that's not the problem. I've also resoldered the connections to make sure nothing was shorting out, that didn't help either though

I'm a bit lost for explanations, I have a DMG power cord coming in the mail so I can test if it's a power issue next.

It also has a Porchie (VGA out board) installed which could be drawing just enough power to cause issues with my keyboard???? Idk further testing is required.

https://bennvenn.myshopify.com/products … r-your-dmg

More info:

I set sync to keyboard inside LSDJ

DMG CPU v4

PS/2 port soldered following Thursday Customs Guide
http://store.thursdaycustoms.com/product/ps2-jack

LSDJ versions 5_7_8 and 4_9_4

This PS/2 Keyboard
https://rover.ebay.com/rover/0/0/0?mpre … 2423812988

This PS/2 to USB adapter stripped down for the PS/2 port
https://rover.ebay.com/rover/0/0/0?mpre … 2472433332