When I picked up my 2015 a couple of weeks ago, I could not get the TV to play thru the Home Theater unit. I looked at the back of the TV and found that the L/R audio jacks were in Audio In jack holes vice Audio Out. I switched them and then was able to get the TV to play on the external speakers. It's the Genesis unit that plays the sounds to all the speakers.
Bob & Kelley
2015 Flagstaff 26RBSS
2014 FORD F-150 Supercrew 4x4
3.5L Ecoboost, 3:73 axle, Max Tow Pkg
2015(36 nights) 2016(37 nights so far)