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I have motorola mini box connected to Hisense 32H4+ via Coax. When viewing the cable on the TV, I'm not seeing the whole picture. It is cutoff on left and right but it isn't even filling the whole TV screen. I tried all the Hisense Picture size options and none provide visibility of the full picture.
Is there any particular reason you aren't using HDMI to connect the box to the TV? That will give you more resolution options.
Coax is fine for over-the-air HD signals but not HD signals from a cable box. You'll need either an HDMI, DVI, Component or VGA cable to carry anything formatted above 480i. That's what your seeing now: 480i.