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I had same problem when I purchased new TV. My problem was, Outdated cable box. With new cable box, problem solved.
Sorry, there was a problem. Please try again later.Mine works perfectly. However, if you are having trouble, I suggest you call the store you purchased from or go on You Tube and look for your answer. I promise you someone has posted a video that covers that. I hope this helps. You Tube e in: How to adjust your Roku TV screen (full screen), full picture size. Keep this in mind as well. Not all movies fit perfectly on your screen. It actually depends on the person who posted and on the actual size they made the movie. Good Luck!
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