Larry bought a used TV and the audio doesn't work on one channel, except for commercials! Leo says that could be due to secondary audio programming (SAP). The channel may not support that. He should try turning that off. He should try using some headphones and see if they work. If he can hear the channel, it's clearly something wrong with the audio processing on the TV, or with the speaker setup. He should set up mono sound and see if that works.
There's also apparently an issue with Cox that others have discussed at forums.cox.com here.