If you re using a v cables instead plug each cable into the same colored port on the back of the box e g plug the yellow cable into the yellow input.
Comcast hd cable box troubleshooting.
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.
Learn some tricks for resolving the most common issues with these steps.
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.
This video will show you two ways to reset your comcast xfinity cable box specifically the x1 cable box.
Make sure your hdmi cable is plugged into your tv and the hdmi out port of your x1 tv box.
Get help troubleshooting high definition issues for your xfinity tv service.
Hd troubleshooting for your non x1 tv box.
The video cables between your tv and x1 tv box should be firmly connected.
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.
Learn more about your comcast tv box and download the user manual here.
Plug in one end of the hdmi cable.
It goes in the wide narrow port in the back of the cable box.
Having problems with your remote control.
You should only get cable boxes directly from comcast for new service replacements or additions.