My TV will not change channels. Have tried two changers to no avail. Can increase volume and turn on and off but cannot access Guide or Xfinity buttons. Any ideas?
Try new batteries? Unplug the box and plug it back in?
if you have an X1 box, your XRE may be out of sync. Simply unplugging it and pluggit back in may fix it.
If that's not it and your volume is working AND your tv powers on and off, hold down set up, when the light turns green press "xfinity" and put in the 3 digit code. I've seen this happen (not often tho)