Hello and Welcome to Just Answer.
My name is ***** ***** I can help you with your question, and in order to give you the best advise I need to know a bit more information:
= Can you please provide the FULL model number of your LED Samsung TV.
= Although this issue happened suddenly, does it go away when the TV is shut down or when it's not in used for several hours?
= When did you notice this issue? Was it ever happening on and and off in the past?
Please try to reply to my questions the best you can so I can find the best possible outcome for you.