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You could try to use a different HDMI cable or a different Cable Box.
Sorry, there was a problem. Please try again later.I had this same problem. As I was messing around trying to figure it out, I clicked on some drop down menu near the upper left corner and about four choices appeared, and I chose HDMI (1 or 2, whichever one I had it plugged into), and it started working. I don't believe I even had to do a channel search after that.
Sorry, there was a problem. Please try again later.Your output on your cable box maybe higher than the 720p that the tv is capable of. If the box is displaying in 1080 than the tv wouldn’t be able to display this as it’s max is 720.
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