Originally Posted by rsonnens
I have the exact same issue with my 2017 lg oled and my Denon AVR. The issue is really the damm LG TV.
For me it also randomly selects other devices on my hdmi chain connected to the AVR and not the device that initially caused the set to turn on! As far as I can tell this happens when the TV scans for hdmi devices so they can be accessed from the TV. If is very frustrating.
The TV really wants to be the hub and then only connect to the AVR. But this sucks too because then TV then can't display the audio volume and the AVR not being in the video path can display the volume.
I really wish the the LG would allow ARC without other CEC control.
Eventually this will be moot for me when I can get all my 4K streaming from non TV apps, but it is annoying now because I'd much rather have DD+ support.
My older Sony first gen LCD 4K worked fine with CEC and did not switch inputs on the AVR. The Sony also could display the audio volume from the AVR, which I liked because it is not visually clunky like the Denon volume bar.
I have an LG B7 oled tv and a Marantz SR7005 receiver. No end of hassle with HDMI CEC. Both the tv and the receiver do not allow you to separately enable/disable CEC and ARC. They both lump them together into a single setting. (Called "Simplink" on the tv, and "hdmi control" on the receiver.)
I ended up purchasing a couple of Lindy HDMI CEC filter adapters:
They are very simple and just remove pin 13 from the connector, which is the pin dedicated to CEC data.
I had to put one on my Roku 3 (which is plugged into the receiver) as it kept telling the receiver to switch to the Roku input for no good reason. That worked great, and the Roku can no longer control the receiver. I also put one between my tv and my receiver, so the tv would stop telling the receiver to switch to the tv input. Unfortunately, filtering out CEC also made ARC stop working, so I had to remove that adapter. All of my 1080p devices are plugged into my receiver, but my 4k devices are plugged directly into the tv. So, I need ARC.
I'm not sure if ARC relies on CEC, or if one of the devices (likely the tv) sees that it can't do CEC, so disables the Simplink feature altogether, which kills ARC. Frustrating either way. It's enough to make me want to upgrade my SR7005 receiver to something that will handle 4k, so I can plug all of my devices back into the receiver. (Although my SR7005 is otherwise perfectly great.) I guess the benefit there is that I wouldn't have to rely on ARC anymore, which only sends lower quality Dolby Digital or DTS audio to the receiver. Having my 4k devices plugged straight into the receiver would at least get my HD audio back.
Or, a cheaper option would be to get an HDMI switcher box, and have *all* of my devices plug into the switcher, which plugs into the tv. Then the receiver would no longer be the video hub, and would just be receiving ARC from the tv and that's it. As long as the hdmi switch has IR support, my Harmony remote can control it, so my wife wouldn't care. The downside being that I'd be using ARC for everything and wouldn't get any HD audio at all.