This was a working SP. I wanted to install a USB-C mod for a more modern charger. After installing it, the screen displays...

Ok, so I managed to correct this problem. I had to reflow the CPU and everything began working normally. I'm guessing there was some micro fault or bridge in one of the video pins. I spread flux around the CPU and then used my hot air at 380c to heat around the chip until pins were shiny. I was careful not to put too much heat into the board for fear it could have damaged the buttons on the back. Thankfully this worked for me. Here are some pictures I took during the evolution of this project. After USB-C mod second installation Here is the Capacitor I replaced. CPU Before pin reflow. And after pin reflow Which leads to a happy Gameboy.