All of my HDMI input sources are switched by my Yamaha HT receiver. When I set up my new 55ST60 the quick setup recommended I use HDMI 1. So far, everything works great except I also use a UHF antenna as a backup to my cable service. When operating the TV in antenna mode there is no audio from the TV back to my receiver although the internal TV speakers work okay. I'm a little fuzzy about ARC since my old plasma didn't have it. Should I be using HDMI 2 (with ARC) to get the TV audio back to my HT receiver? Or is ARC something entirely different?
Yes, you need to use the HDMI 2 input and you need an HDMI cable capable of ARC, it should say "with ethernet" on the cable. Then you need to turn on ARC and HDMI control on the receiver and Viera Link in the setup menus on the TV, also set the Viera Link in apps to home theater, the latter won't be accessible unless everything else is properly set and powered on.