Could you post close pictures of the circuitry, the cables, the solderings... ? I figured out the issue, turns out it was the power supply. I re-soldered the cables and on/off switch, plugged in the original 5v power suuply the problem repeated itself, however once I plugged in a 5.1v power supply ...

I am currently in process of creating my first Gameboy Zero using the guide by Wermy, all has been going well except the adafruit powerboost 1000c en pin keeps flicking the power on and off continuously. First i thought my soldering was touching, nope everything was fine there, next I desoldered the...