Try setting up speakers through your TV. (I suppose your Tv is wifi in to tv) Tap menu on tv remote. Go to network. Tap wifi, then follow TV's direction.
it could just be a result from the streaming service itself buffering on your network so if the audio and video are not in sync while streaming try rebooting the streaming service and disconnecting and reconnecting the network. If its the TV itself that may have the problem then its an issue with the image processing and a quick fix to that is to set your TV into game mode.
? 5:30
https://www.youtube.com/watch?v=zDG-PZtqCNE
Jan 4, 2012 - Uploaded by Nazil Rahman
Samsung 40'' 720p tv and Panasonic home theatre system ...How to Connect an HDTV to Your Sound ...
? 4:46
https://www.youtube.com/watch?v=fFNEKnlQd6I
Dec 13, 2013 - Uploaded by Tampatec
How to Connect TV to Surround sound receiver system setupusing HDMI ... to Samsung, LG, Sony, Vizio ...
Dec 16, 2014 - hi I bought Panasonic SC-BTT405 blue ray disk 5.1 home theater and ... Unable to connect Samsung smart TV with Panasonic home theater ... I have an LG55LA9650 smart TV hooked up to a Bose 3-2-1 home theater system.