I just hooked up my new JVC RXD411s.
(1) I can confirm that the JVC can pass all video signals, both HD and non-HD, via HDMI to the TV.
(2) When the JVC is off, no signals appear to be passed through or out of it.
(3) To get sound out of the TV, I have a dual cable hookup for both my DVD and Box, so they are hooked up to both the receiver and the TV directly.
As is now well-documented here, the JVC RXD411s will not pass sound through its HDMI connection to the TV, whether it is on or off. The justification is, I suppose, "why would you WANT to listen to the TV when you have such a nice audio system?"
Well, my wife doesn't want to mess with a system that requires turning on the receiver every time just to watch Baby Einstein videos or the Food Network, and neither of the these programs benefit from surround system.
I suppose a Harmony remote (or equivalent) would simplify turning the system on, but we don't have that.
So, I have my Hi Def Dishnetwork box and Panasonic DVD both running to the JVC receiver via HDMI, and from there to the Input1 of the TV via HDMI. But I also have the Dish box running via component (and RCA audio) to the Input2 of the TV, and the DVD running via S-Video (and RCA audio) to the Input3 of the TV. My wife knows to switch between Input2 and Input3 of the TV, depending on her need. She never needs to "worry her pretty little head" about the receiver/surround system.
(Of course the picture of the DVD is better through the HDMI, but really, how important is it for videos of puppets to be crystal clear? My 1-year old isn't complaining yet. Plus, I really don't have any other choice; my 3-year old Hitachi LCD rear projection only has component inputs on Input1 and Input2, and only has HDMI on Input1.)
When I want to rattle the floor, I turn on the RXD411 and use Input1 of my TV to view the video with the surround sound on. Of course, no sound is passed through to the TV, but such feature is moot with this setup.
Hope that helps (or at least doesn't hurt.)
Key words: JVCRXD411s, JVCRXD411, RXD411s, RXD411, dual hookup, dual cables, HDMI and component, same time, sound through HDMI, audio through HDMI, TV speakers.