I had the same issue last summer on my 2014 3110 and posted this reply with a solution (//heartlandowners.org/showthread.ph...nd-look-closer?p=331711&highlight=#post331711):
"I had the same issue with my surround sound (FM coming through the tv audio). What I found was there is a paired rca audio cord (red and white plugs) connected incorrectly to the tv. The dvd/surround sound system needs the audio - out signal from your tv. I found that my rca cord was connected to the input of the tv giving the fm feedback signal when playing the tv. When the rca cord is connected correctly then the dvd/surround sound will play the audio portion of the tv through the dolby sound system. I used an HDMI cable to connect the dvd/surround system to the tv to achieve a higher quality picture when playing movies. The HDMI cable takes care of the audio and video signals in a single connection."
However, you still need to connect the rca cables to the output of the tv to correct the fm radio feedback. I am surprised that Heartland has not read these posts and corrected the issue.
Hope this helps.