TV Bildschirm plötzlich grau/weiß

Hatte des eben in einem englischen sub gepostet, deswegen ist es hier erstmal auf englisch, sorry :(

Hello, my tv screen suddenly turned grey or white, sometimes it even appears to show some kind of "negative" image. its not on certain parts of the screen, it is literally the whole screen (see pictures)

I already tried resetting screen settings, turned power on off, unplugged itself and all devices from it, waited over an hour to cool it down, tried other power outlets etc but nothing seems to have any effect. Someone knows what I might be able to do or is my tv just broke now?🫠 Its some kind of Sony Bravia from 2014 or 2015 I think (model number is KDL-43WD757)

Thanks for your time! :)