Multichannel PCM 5.1 dropping out since 14.10 update



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I’m curious about whether I need the cable or need to just permanently switch the inputs. Also if anyone know what might be special about ports 1 & 2 on an LGC2 TV that would be useful (considering all 4 ports are labelled as 4k 120Hz HDMI 2.1 ports).

My 2 cents (and this is what I’m doing): If using HDMI1 is good enough for you, then hold off on buying the cable for as long as you can. In case the cable workaround has its own bug or IF Sonos decides to address to issue lol.

And then when you finally find the HDMI1 workaround insufficient/intolerable, then buy the cable.

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Ah, I see. I didn’t realise multichannel LPCM required eARC.

That hadn’t occurred to me either until I tried it, or that the Amp was just ARC. 

 

I’m a little confused as to how the fault could be with the TV though if it’s set to just passthrough the bitstream?

Presumably the TV shreds the HDMI data stream from the console/bluray and only copies the audio stream to the eARC HDMI port. There’s enough software there for a memory leak or an exception to disrupt the process inside the TV, we know the Beam 2 is reporting the stream drying up. From reading other threads and forums it seems LG have had a difficult time stabilising multichannel LPCM, especially on the 9/X models. Having said that, it doesn’t rule out the Beam provoking the TV into quitting sending data. Would be interesting to know if the diagnostics had shown any kind of handshake during the recovery of the audio drop outs.

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@Eruvatar, who just got a refund, only bought their unit Jan 2023 so unlikely that there are already revisions that address the issue. “Repair” could potentially be better if they secretly know how to address the issue but are keeping mum due to costs involved.

The unit on display in the store had “2107” stamped on it, like mine. I agree, if there’s a faulty unit with a very recent manufacture date then there doesn’t seem much point exchanging the h/w.

I'm also having this issue with the Sonos Beam Gen 2 and the LG C1. I had already disabled QuickStart+ and turn off the TV has not helped.

 

Is it the consensus that this is an LG bug? Is there any point contacting their support?

So after 3-4 days the issue returned after turning off QuckiStart+ LG recently started the roll out of a new update it is available on a few countries but no in the US 

I will download it manually through the LG Korea website and install it manually via USB and see if it is finally fixed 

@Ariel47 

 

Let us know if that works.

 

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Hi @kikeminchas, @ste_ms et al

If a factory reset of your LG TV does not help, I can only recommend you get in touch with our technical support team who can, at least, create a case and get things documented - if nothing is documented, there isn’t any evidence that there is a problem and it will therefore not be investigated.

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5.1 PCM started to work fine with PS5 and LG CX 3 days ago. It worked perfectly for two days, 3-4 hours of gameplay each day and no cutouts at all, until I had to cut power from all three devices, and now the issue is back again. I wonder what did I do to make it work for 2 days?

EDIT: I just read this thread a bit more and realized that the same happened to a lot of people before, but then the issue came back again. Sigh...

Thanks for taking the time to post the new data point. It seems that LG C3 chipset isn't drastically different to C1/C2.

Indeed, power cycling the Beam2 should re-instate the dropouts immediately.

Has anyone else tried the new firmware to resolve this issue?

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I think the fact that the mods are not engaging with this thread anymore is telling. I think Sonos have reproduced the issue and so don’t need any more diagnostics or support calls coming in.

At this point they either don’t know how long a fix will take, or how it can be done and hence don’t want to set expectations, or they know it’s unfixable and are hoping this just dies away in time.

 

Beam 3?

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15.4 is out now, I’ve installed it on my system but not tested it yet. Prepared to be disappointed though. 😁

5.1 PCM started to work fine with PS5 and LG CX 3 days ago. It worked perfectly for two days, 3-4 hours of gameplay each day and no cutouts at all, until I had to cut power from all three devices, and now the issue is back again. I wonder what did I do to make it work for 2 days?

EDIT: I just read this thread a bit more and realized that the same happened to a lot of people before, but then the issue came back again. Sigh...

Thanks for taking the time to post the new data point. It seems that LG C3 chipset isn't drastically different to C1/C2.

Indeed, power cycling the Beam2 should re-instate the dropouts immediately.

Sorry, maybe I was unclear. I have an LG CX, not a C3. 

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