You're a Comcast cable TV customer. You've just bought a new TV set that you want to use with your Comcast service. No problem. Disconnecting a Comcast cable box from one TV and reconnecting it to another TV is a task so simple you can do it on your own. There is no need to contact Comcast customer support to request a visit from a Comcast technician unless you plan on setting the new TV up in an area where there is no nearby cable wall outlet installed.
Disconnect Comcast Box From Old TV
Turn off the TV and Comcast box. Unplug the power cord for both devices.
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Detach the coaxial cable connected to the Comcast box's RF "Cable In" terminal by twisting the screw-on connector, located at the end of the cable, counterclockwise to unlock the cable. Then pull the cable's plug from the terminal. (This step needs to be performed only if you are physically moving the cable box instead of simply swapping out TVs.)
Unplug the AV cables, coaxial cable or HDMI cable (whichever applies) connecting the Comcast box to the TV from the TV.
Move the Comcast cable box to the location where the new TV is or swap out the old TV with the new TV (whichever applies).
Connect Comcast Box to New TV
Plug the coaxial cable coming from the cable wall outlet put in by the Comcast installer into the cable box's RF "Cable In" terminal (if this cable is not already connected). The cable is secured to the terminal by twisting the screw-on connector at the end of the cable clockwise until finger-tight.
Use a set of AV cables to link the cable box's red "Audio R," white "Audio L" and yellow "Video" output jacks to the color corresponding AV input jacks on the TV set. (This step needs to be performed only if you are using a standard-definition cable box and TV set.)
Insert one end of an HDMI cable into the cable box's "HDMI" output jack. Insert the other end of this cable into the "HDMI" input jack on the TV set. (This step needs to be performed only if you are using a high-definition cable box and HDTV set.)
Connect the cable box to a power source. Connect the TV to a power source. Turn both devices on.
Continuously press the "Input" or "Source" button on the TV's remote control until the TV's video input channel is set to the AV source (if you're using a standard-definition TV) or the HDMI source (if you're using an HDTV). If everything is set up properly, you should be able to view whatever is currently playing on the Comcast box on the new TV set.