On most comcast cable boxes the hdmi port is either in the bottom right corner of the box or at the bottom of the box s back.
Comcast hd cable box troubleshooting.
Make sure your hdmi cable is plugged into your tv and the hdmi out port of your x1 tv box.
Replacing your tv boxes and modems faqs.
The video cables between your tv and x1 tv box should be firmly connected.
Learn more about your comcast tv box and download the user manual here.
Get help troubleshooting high definition issues for your xfinity tv service.
Learn some tricks for resolving the most common issues with these steps.
Learn about replacing your equipment now to get the most out of your xfinity service.
Plug in one end of the hdmi cable.
It goes in the wide narrow port in the back of the cable box.
This video will show you two ways to reset your comcast xfinity cable box specifically the x1 cable box.
You should only get cable boxes directly from comcast for new service replacements or additions.
If you purchased a cable box from ebay craigslist or any other re seller comcast will not activate it because it is actually an un returned rental.
Having problems with your remote control.
The coaxial cable should be firmly connected to the x1 tv box and wall jack.
All comcast cable boxes are property of comcast and none are authorized for sale by other people.