Samsung 60" smart tv model # un60f6400af
Unfortunately, this problem may require servicing from Samsung. There is a video online explaining how to fix the problem, but it involves removing the back panel of the TV.
I don't know how old your TV is and whether or not it's under warranty. The safest thing to do is to contact Samsung for repair. In the meanwhile, here's the video if you're adventurous enough to try it:
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