I know this is a old question but the tab s5e screen actually fits the tab s6 screen perfectly it just doesn’t have a cut out for the fingerprint scanner and it doesn’t have the matt at the back of the screen for the spen so if the fingerprint reader doesn’t pick up fingerprints at all then it’s definitely got a tab s5e screen on it. It could of corse be a genuine s6 screen with a loose connection but I have never found a way to get round the fingerprint part not registering fingerprints so definitely try and use the fingerprints and if it doesn’t work then it’s got the wrong screen and will never work. Hope that helps :) Update (11/09/23): It’s a hardware problem either loose ribbon cable or the Wacom chip has gone bad (rare)