How to fix BLACK SCREEN iPhone 4, 4s, 5, 5s, 5c, 6, 6s, 6 7 plus

How to fix BLACK SCREEN iPhone 4, 4s, 5, 5s, 5c, 6, 6s, 6 7 plus, iphone digitizer black screen, iphone 6 black screen after screen replacement, iphone black screen fix, iphone 4 unresponsive black screen, iphone 6 black screen home button not working,  iphone half screen black, iphone 6s stopped working suddenly, my iphone 5 screen went black but the phone