This can be a cable, connection, board or LCD panel failure. You didn't reveal the full model number so without that and even with you get estimates then decide if repair is worth it.
Bought Samsung LCD smart TV 4 years back and from last week i started seeing a vertical streak black lines on the screen.
Wondering what is it and how it caused?
Also possible help/advice on tech contatct will help.
Your suggestions/help appreciated.