We recently purchased a Samsung UN6350 series 40 inch LED smart t.v. It is cutting off the top of heads and the bottom of words. We called Samsung tech and they walked us through setting it on 16.9 ratio...that did not help. They told us it was in our cable box so we called COMCAST and they walked us through setting the cable box on 16.9 ratio. That didn't work so Comcast said to call Samsung and Samsung said call Comcast...Help!!! Thanks for your suggestions.