Chosen Solution
s7 screen has been replaced - on display it shows it is switching and making sounds but the screen isnt turning on any advice is welcome
Check the connections for damage and clean them with a qtip and alcohol and a soft brush. Update (06/12/2020) Check the screen in a dark room and shine a flash light on the screen. Make sure you wake up the phone so it would show an image. It could be a backlight issue.