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From your cable box with an HDMI connection.
Sorry, there was a problem. Please try again later.Assuming your Comcast box is connected with an HDMI cable you should connect it to an HDMI port in the back. If you have a sound system that is connected through your Comcast you should connect to the HDMI port labeled HDMI (ARC), this means Audio Return Channel and means that the audio from the TV is returned to the cable box so it can be sent out to your sound system through the cable box. This helps to limit the amount of cables going to your TV.
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