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The Comcast tech hooked the incoming coax to the cable box and the HDMI cable directly from the cable box to the TV. My initial thought was to be able to watch the TV without the receiver on,(just using the speakers on the TV).The AV receiver would be used for surround sound when needed.he wiring below assumes that you have all components with hdmi capability that also have at least hdmi v 1.3a. 1: cable coax from the wall (cable feed coming into your home) to cable input on cable box. 2: cable box hdmi out to an hdmi input on receiver. 3: hdmi out from blu-ray player to an hdmi input on receiver.
Connecting the Audio/Visual. 1  1. Purchase an HDMI wire if you have a high-definition (HD) TV. 2  2. Insert one end of the HDMI cable into the back of the Comcast cable box. 3  3. Extend the other end of the HDMI cable to the back of the TV.  4. Opt for a component cable if you want to receive HD channels but donât have an HDMI port.