Hi, very often when you buy a new TV, you have some problems with the screen. It is very good when you have a warranty on your TV and you can take it back to where you bought it. However, if you don't have a warranty then you're probably in a bad position and to help you I want to recommend https://howly.com/electronics/....type-tv/issue-screen . In this article you will find various sections on how to properly troubleshoot your TV screen to make it work.