New TV, remote will NOT work with Sound (+/-), Mute, or power on/off. All other features work fine. I've rebooted the box, tried both XR5 and XR11 remotes, repeatedly paired the remotes automatically and manually, had Comcast send a signal.....
Solved! Go to Solution.
I found the answer! The pairing code for my new TCL television was not listed anywhere, except for someone answering this same question on another forum.
The TCL code is 11756.
BTW, I know that the cable box itself has nothing to do with the remote working with the TV-- these were the suggestions of the Comcast associate. His conclusion was to send me a new remote.