My philips 4k ultra HD tv has stopped working. Ive tried everything, left it unplugged the whole night

May 20, 2018
Yesterday around 4 or 5 i was casting my samgsung s6 edge to my philips 50inch 4k ultra HD tv i ended the cast and switched it to netflix; the screen went black/greyish ( like it normally does when switching it to another source). I left to go wash dishes came back and the screen was completely black( not even the LED light was on. I searched online and that didnt help. I bought a new fuse for the tv cord hoping that was the problem but it wasnt. Please help.