Originally Posted by powrwrap
Good to see you are still on this thread, Tampa8. I guess my question about the hack was directed at MMcCraryNJ and flhthemi, as I had searched this thread for any posts by them mentioning audio, 5.1, and the hack but I didn't find anything. I'm going to assume they did it.
My cable box is connected to the TV with an HDMI cable. The TV sound output goes through an optical cable to the audio receiver as I don't have HDMI inputs on my receiver. As I said, I can get 5.1 surround from my TV through the optical cable to my receiver if the source is Amazon Prime Video or Vudu or if I use a recorded source from an external drive via the USB ports on the TV. Just not through the HDMI connected to the cable box.
I guess I'll have to do the hack.
I never did the hack either. Just connected and set the audio options on the TV.
Since I made that post, I've gotten new video sources. So here is my signal routing:
Dish Network Hopper w/ Sling
Each goes directly into the TV via HDMI 1-4. No other audio cables are connected from each source.
One optical cable from the TV optical output to an Onkyo 7.1 input.
Each source passes Dolby 5.1 from HDMI into the TV, and the TV passes it from the optical audio output into the receiver. The receiver indicates it is receiving a Dolby 5.1 source and the audio channels are all outputting to the speakers correctly (dialog in center speaker, music/sfx in left/right, etc)
I would check the settings on the Comcast box in your case, play around with it and see if you can get it to work. Cable boxes are known for not having the most wonderful or stable audio output. Other than that, it could be as tampa8 mentioned, that earlier model 7600s don't do it unless you perform the hack, while later produced units have it set up from factory. I can't tell you when mine was manufactured, but I bought it very late in the yearly cycle (It's a 2012 release and I bought it February of 2013).