If you are not getting audio from the TV itself when watching a news channel, try one of these:
Does your TV menu show you a setting for "Fixed/Variable"? It should be in the "Audio" section of the menu.
If so, change it to Variable as some televisions will shut of the speakers when it is set to "Fixed". The idea behind this is you may want to connect your TV audio outputs to an amplifier or surround sound system and adjust the audio from that source, not your TV.
Do you have a 3.5mm jack (Headphone jack) with a cord plugged in to that jack? If so, unplug that cord as some TV's will mute the speakers if a headset is plugged in to the TV.
HAPPY CAMPING!! :D
Daryl and Sandy
2013 Eagle 314BDS
2012 Ford F150 Platinum, 4 x 4 Crew Cab with Ecoboost