Thanks for your message. I have tried everything:
- if you can update AVR (or TV) firmware, then do it. HDMI issues like this are some of the most commonly fixed ones:
no updates available. It uses WebOS 05.50.10
- on both AVR and TV, ensure that "HDMI CEC" (or HDMI control, or similar) setting is turned ON. ARC depends on CEC to signal commands back and forth. Some manufacturers use confusing names like "Bravia Sync", "Simplink", "Denon Link", etc.:
Checked. On AV I need to activate ARC to make it work. On TV there is not way to disable it if it's connected to the HDMI ARC plug.
LG has as you mentioned Simplink (HDMI-CEC). Even if I disable it when I choose HDMI ARC audio channel it gets enable again so it can't be deactivated at all.
There is something else called "AV sync" but I guess this is to apply some delay from the TV
- if you have an option for E-ARC (Enhanced ARC) turn that OFF, at least until basic ARC works fine:
This LG model has not E-ARC
- use a new HDMI cable, something certified for 4k (even if you don't have that) and "with Ethernet":
I used 3 HDMI: one I was using on my monitor, another one from Amazon (4k certified) and the Xbox SX one, which is the ultra fast (2.1, 120hz)
- DO NOT use an active HDMI cable. These are often super slim and/or very long cables, and usually have one end marked "in" or "source" and the other "out" or "TV" or "sink". These may not work with ARC.
Can't see any of those marks on these cables
- Only one HDMI input on the TV is compatible with ARC, make sure to use that. If possible, don't use any other inputs (send other sources into the AVR if possible).
Yes, it's connected to HDMI2:
https://cdn-files.kimovil.com/tv_default/0004/10/thumb_309616_tv_default_big.jpeg- If the AVR has more than one HDMI output, only one can use ARC.
Nope, only one:
https://i.ebayimg.com/images/g/u68AAOSwuOph5TnF/s-l1600.jpg- for both TV and AVR, if using the
wrong port, the devices may still think they can use ARC (because CEC communications still works) but the HDMI ports can't physically do it so you get no sound.
I assume the ports are correct since this problem doesn't happen all the time and as I just mentioned both TV and AV only have one port for HDMI ARC
- In settings for TV and AVR, look for automatic power on/off options. You do want the TV to be able to control power of the AVR:
This is activated by Simplink. Inside this option one check is for the volume and the other one for the power
- You might need to turn on the AVR before the TV, so that when the TV wakes up, it "sees" the ARC is available and uses it. Otherwise it might automatically switch to some other default sound output, without you even knowing it. This is a pain but if you use a universal programmable remote, you can usually program a custom power-on sequence with necessary delays to accomplish this:
Makes sense but when this happens I can notice if the sound is coming from TV or 5.1. Normally when TV turns on the AV does but it takes up to 10s. During this time there is no sound
- AVR input will need to be "TV" (etc.), but there are still multiple possible sources of audio for "TV", such as analog RCA jacks, optical digital, maybe Coax digital, and finally, ARC. Don't connect anything to other TV audio inputs (especially digital optical/coax), and if the AVR has settings to select the audio input, either choose automatic, or ARC only.
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Yeap, all disconnected. Just plugged in to test
Now I can't even change volume when any digital channel selected from TV. It shows a disable icon:
This is a new random thing I don't know about (more info: https://www.avforums.com/threads/lg-65uk6300plb-flashing-mute-icon-and-menu-wont-go-away-see-image.2273900/)working now
I think what it makes more sense now is to have an analog connection. I don't want to get crazy or get you crazy as well trying to find the solution because maybe there is none. Knowing my TV has no 3.5 should I buy a DAC?