I recently bought new equipment, including a Vizio XVT323SV TV and an Onkyo TX-NR809 receiver.
I wanted to take advantage of the the Audio Return Channel (ARC) feature of HDMI 1.4 on these devices as the TV has built in Internet apps, including Netflix.
After following the instructions in the Onkyo to set this up, I was at a loss to get it working. I contacted Vizio who walked me through enabling CEC function on the TV. Once this was setup, the TV recognized the receiver and the ARC function worked.
So, my first question is: Is this normal to have to force the use of CEC for ARC? I don't know if ARC is dependent on CEC - they would seem to me to be different technologies - but does ARC depend on CEC communications?
The next thing I noticed was that when turning on my receiver, the TV remote's volume controls now were tied to the receiver audio. If I turned off the receiver, the TV remote's volume controls now controlled the TV. This kind of makes sense - as it assumes I am using the ARC function and want to use my receiver to control the volume if its on. However, what also occurs is that when I use my TV remote to turn off my TV, it automatically turns off the receiver as well.
So my second question is: Is the above behavior par-for-the-course for CEC devices? I understand that in *most* scenarios, if you are turning off the TV you probably want the receiver off, but what if I am switching to my projector (2nd HDMI out on receiver) - or what if I just want to listen to music - I then need to turn my receiver back on again.
I believer that Vizio screwed up here in their implementation. I have confirmed with them that this is "as designed" and, I quote their support:
"With the way CEC works, the devices will respond to each other. You would need to disable CEC in order for you to be able to power the receiver on without the tv powering on, or to power the tv off without the receiver also powering off"
But alas, I can't disable CEC without loosing ARC function.