said by Methodical2:I forgot to mention that the Tv is full HD (1080P), however, when I connected the Tv with the HDMI, the FIOS setting had 1080i as an HD choice and not 1080P like on my Vizio Tvs, so something strange is going on. I will get those newer boxes and report back my findings.
The specific post you should look at also is the following:
"I have a vizio and had audio dropout problems when connected with HDMI in the past. The following fixed it. Not sure if this will work for you, but you can try.
Power off the Set top box.
Hit Select
Hit Menu
You will see a white screen and an all text menu called USER SETTINGS. Use the arrow keys to move around.
Scroll down to a line that says "ADDITIONAL HDMI SETTINGS" and hit a right arrow to get into the next level of the menu
There is a sound setting called AUDIO OUTPUT It says AUTO Scroll to it and change it to L-PCM.
Exit out of the menus, power the unit off and power it on again."
You mention "older version" STBs. If you mean 6XXX STBs, they cannot process MPEG4 channels; if you mean 7XXX STBs, they can process the MPEG4 channels. But neither outputs 1080p. Only the new Quantum STBs (VMS and remotes boxes) they do have 1080p output.