Screen or logic board
Recently I dropped my I phone and the screen turned black and white and will not respond to touch. So I asked apple support they said I could be a digitizer cable shook loose I checked it out and that wasn’t the problem so I went to the Best Buy to have them look at it and they said that it was either something in the screen or my logic board. I would buy a screen from ifixit but it is 65 dollars and if it turns out to be the logic board I would have wasted 65 bucks is there anyway to tell witch it is?