This one is quite the frankensteins monster with these wires. But well explained reasoning for it to get around Nintendo security. A good effort, and the game is running under that garbled mess so its not hopeless.
Just redo all the solder joints with proper flux, watch voultar's videos, it's worth doing it correctly, sadly the other carts are just timebombs, you could just check continuity using a multimeter also..
I just put an IPS backlit screen in my GameBoy pocket... It worked well for a week and then started turning off... So, I popped it open... Same issue. One of my solder points didn't hold, so I had to heat up the iron and touch it up. Works perfectly now. I am not an expert at soldering either. Haha
Chuck Taylor All-Stars= a symbol of a free Spirited person Been wanted to make my own video games since I was a kid the genesis of my interest hacking/homebrew can not be disclosed(funny can reamber that idea but not other ideas as a kid)