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if the box comcast sent you does not have an hdmi output you need to use composite cables or component cables, if its a real dta box you can only use coax, those are meant for old tv's mostly with no digital tuners
How do you hook up a TV with a HDMI cable is you are using the DTA PAC UDTA cable box that Comcast sent out for additional room setup?
Use this tool to find the codes of your devices and to get specific instructions on programming the codes into your Comcast remote.
Alerts are an easy, quick way to manage your account and get information - like payment confirmations and your current balance.
Find everything you need to know about setting up your wireless gateway.
Get details on weather, traffic, sports and more all from your XFINITY TV on the X1 Platform Dashboard.