Chosen Solution
3DS Turns ON and Turns Off And Makes A BOP sound AND turns off also that screen is 1. sometimes the screen just blacks out 2. lowers brigntness for no reason [ i dont have auto brigntness] 3. Turns off for no reason. thats all Update (12/14/2020) has cfw and homebrew and its just hacked by the way
Have you checked if it’s a ripped ribbon cable? When you turn ON the console and make the popping sound the upper screen flash white?