So some weeks ago I had to replace a Lg g2 screen.. I bought the replacement and with a little difficulties i replaced it.. al seemed to be ok , the new display worked flawlessly... but I had found a very huge problem.. the display every time i power on the phone suddenly turn off.. I searched days thinking there was a problem with the digitizer, then I upgrade it to chitchat hoping it would fix the situation.. nothing. I couldn't sleep because I didn't know what to do , i spent almost a week searching a way to fix the problem.. then I found it.. i thought: my father a lot of time said me "a bit of tape can fix the world" ..well i found out there was probably an issue with the proximity sensor, so i had the brilliant idea of cutting a small piece of black tape and putting in in the position of the proximity/light sensor with two holes separated for the sensors.. well i booted it on and.. I had fixed the phone! I think it has been the most difficulties ( not in difficulties but in finding the issue aha) I did