I picked up 2 Tetris 16B boards, one with rom one without, both have encrypted CPU. On the complete kit, everything works. I swapped the Tetris ROM board over to the other 16B, all I get is a white screen with some pink or magenta vertical lines here and there. I awaited a bit to see if there would be sound, but I didn't hear anything, so it doesn't sound like a dead cpu battery issue. Japanese auction seller said it was working before shipping, but that was 2 months ago. Since I don't know what else to look for, I swapped the CPU with an Aliexpress 68k CPU, and I get a completely black screen instead. What should I check to see what broke during shipping? Any pointers for resources I can read through?