my iPhone x just started doing something similar a couple of months ago. the screen had never been replaced, i cleaned the whole phone+speakers regularly and i always had a case on it. it was in the shower and a little water got on top of the case and it shut off and would not turn back on. the next day i finally got it to turn back on but face id didn't work and then a couple weeks later the screen turned static (like you said just like an old tv).