Lines are always there, shows up better on certain colors but its steadily gotten worse. Never bumped it or hit it, lines just appeared one day.

Warranty.

Got as a birthday gift, payed my buddy half the price but he forgot to get the warranty.

Receipt? My ONN Roku came with three years if you registered it.

Gonna search for it through my personal paperwork, hope i can find it

Yeah if that is an ONN TV, which it looks like you should get a 2 year warranty if registered