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You take and HDMI cable and connect the HDMI video out of the Xfinity cable box and HDMI input 1 of your TV. From there once the cable box is turned on and the TV then you should be able to watch TV. If not, then you may need to change the TV input by pressing the top left "Source" button and you can continue to press this button until you have chosen the HDMI input that you are plugged into
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