As I told you before , you need to strip EVERYTHING back down and start from scratch reviewing those 5 potential issues I mentioned before. When I did mine, I found that the pressure from closing the PCB+eprom into the cart shell, broke loose numerous wires. So after I soldered them to the solder pads on the PCB, I hot glued them.
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Bounty: Neo Geo Pocket and Color Games PAL/UK. Dive Alert, Pocket Reversi, Puzzle Link 1 and 2, Gals Fighters