Thank you for confirming. I'm glad you were able to check, as this may hopefully be an easy fix.
This means you have a fan fault. There are fans inside the tv, which can clog up with dust, overheat, or fail.
Start by vacuuming off all the vent holes on the back/top of the tv, and blow it out as best you can with compressed air.
Ideally, you'd take the back cover off the tv and clean the fans directly with a vacuum or compressed air, if you are comfortable doing so (power disconnected).
If no change, then we're looking at a deeper problem, which could be as simple as a bad fan, all the way on up to a faulty power supply or control board.
Try the cleaning and let me know the results, and we can discuss further options if needed.