Trending Lyricist I

Multichannel PCM 5.1 dropping out since 14.10 update

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Anyone else experiencing the same issue? Multichannel PCM 5.1 blanks out for a second every 1-2 minutes. I don’t think it’s a bandwidth issue as it works flawlessly with Multichannel PCM 7.1 (thorough test) and Dolby TrueHD Atmos (quick test). And it may have been caused by the Sonos 14.10 update. Setup is PS5→ LG C1→ Beam 2 (via earc).

2 weeks ago before the 14.10 update, I watched a bluray film wherein I had my PS5 transcode the DTS-HD MA 5.1 audio to Multichannel PCM 5.1 (as the C1 does not support DTS) and had no issues. Earlier today, I played a bluray film for the first time in 2 weeks and I encountered consistent audio dropouts every 1-2 minutes. It had the same setup where DTS-HD MA 5.1 → Multichannel PCM 5.1. I tested other bluray discs including the one I watched 2 weeks ago and they all now have the same issue.

Curiously, I’ve been gaming heavily on my PS5 the past two 2 weeks and haven’t had any audio issues. Then I realized that I’ve been using Multichannel PCM 7.1 when gaming on my PS5. So I made some changes under the PS5 sound settings to make it output Multichannel PCM 5.1 instead. Lo and behold, I am now getting the same consistent dropouts in games and even on the PS5 main menu.

I think it’s due to the Sonos 14.10 update as that’s the only firmware update I’ve done in the last 2 weeks. No PS5 update, no LG C1 update. Well actually while I was composing this post, I received and applied the latest LG C1 firmware update and I still have the same issue.

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Pinned Reply By Corry P

Hi @throwawaybeam2 et al

We now recommend you reach out to the TV manufacturer (LG) as this behaviour is also occurring with different soundbar manufacturers (so it’s not a Sonos-specific issue).

Alternatively, please utilize different audio formats from McLPCM 5.1 (e.g., McLPCM 7.1, DD+, etc).

I hope this helps.

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PurpleBat

Lyricist II

Same problem here…

LG C2
Beam Gen2, Sub Mini, 2 x One SL
HDMI 1: Apple TV (Gen2)
HDMI 2: Beam
HDMI 3: PS5 (currently set to 7.1., for no dropouts…)
HDMI 4: Switch (annoying dropouts… sometimes even NO sound)

My Apple TV is connected with an HDMI CEC Blocker. But i am using mostly the TV Apps.
Playing around with connections and power cycles and suddenly it was working.
PCM 5.1 was running without issues for about 6-7 weeks.

After a Sonos Update dropouts again…
Trying around with power cycles, Ethernet/wifi connections, settings and unplugged HDMI 1.
Working again with no dropouts.

Sonos Update yesterday… Dropouts…

HDMI 1 has the same dropouts! Not only HDMI 3/4.
In the Sonos App „PCM 5.1.“ is disappearing for very short moment when the dropout accurs.

Only stable but not acceptable „workaround“: don`t use Apple TV, PS5 7.1 Mode, Switch Stereo Mode.

3

3bada

Lyricist I

LG C1 here. I had the issue on HDMI 1 and 4 with a PS5.

I disconnected every other HDMI (except the beam on HDMI 2 and PS5 on HDMI 1), unplugged the power from the TV and PS5, waited for a few mins then powered them on again and that got it working fine for now. I hope it stays that way until a proper fix exists.

X

xlcoolj

Contributor II

LG C2 and having pcm 5.1 dropouts from PS5 in HDMI 3 and 4. Moved PS5 to HDMI 1 so far no dropouts. Having contacted LG support bout this issue and this forum, I have had LG response:

"I am just getting in contact as our Technical Team has responded on file and have advised that there are no differences in the HDMI ports and so there should not be any reason as to why HDMI 3 and HDMI 4 would be different to HDMI 1. They have advised that we can book this in for a repair as this could be an issue with the HDMI 3 and 4 ports themselves."

So am now booked in for HDMI repair.

O

OmriP

Lyricist III

LG C2 and having pcm 5.1 dropouts from PS5 in HDMI 3 and 4. Moved PS5 to HDMI 1 so far no dropouts. Having contacted LG support bout this issue and this forum, I have had LG response:

"I am just getting in contact as our Technical Team has responded on file and have advised that there are no differences in the HDMI ports and so there should not be any reason as to why HDMI 3 and HDMI 4 would be different to HDMI 1. They have advised that we can book this in for a repair as this could be an issue with the HDMI 3 and 4 ports themselves."

So am now booked in for HDMI repair.

Waste of time IMHO, your TV behaves exactly the same as any other LG TV of its model.

It works “as intended”, the problem is that the “as intended” is faulty.

Ken_Griffiths

LG C2 and having pcm 5.1 dropouts from PS5 in HDMI 3 and 4. Moved PS5 to HDMI 1 so far no dropouts. Having contacted LG support bout this issue and this forum, I have had LG response:

"I am just getting in contact as our Technical Team has responded on file and have advised that there are no differences in the HDMI ports and so there should not be any reason as to why HDMI 3 and HDMI 4 would be different to HDMI 1. They have advised that we can book this in for a repair as this could be an issue with the HDMI 3 and 4 ports themselves."

So am now booked in for HDMI repair.

Waste of time IMHO, your TV behaves exactly the same as any other LG TV of its model.

It works “as intended”, the problem is that the “as intended” is faulty.

It almost seems to infer that the LG Technical Team are aware of a hardware issue with that TV model. I would have the repair and just see what happens after that.

P

PhaseModS

Lyricist III

LG C2 and having pcm 5.1 dropouts from PS5 in HDMI 3 and 4. Moved PS5 to HDMI 1 so far no dropouts. Having contacted LG support bout this issue and this forum, I have had LG response:

"I am just getting in contact as our Technical Team has responded on file and have advised that there are no differences in the HDMI ports and so there should not be any reason as to why HDMI 3 and HDMI 4 would be different to HDMI 1. They have advised that we can book this in for a repair as this could be an issue with the HDMI 3 and 4 ports themselves."

So am now booked in for HDMI repair.

Waste of time IMHO, your TV behaves exactly the same as any other LG TV of its model.

It works “as intended”, the problem is that the “as intended” is faulty.

It almost seems to infer that the LG Technical Team are aware of a hardware issue with that TV model. I would have the repair and just see what happens after that.

No don’t try to pawn off the issue to LG lol. It’s a Sonos issue as well, clearly.

R

RANDUSR23296

Enthusiast I

LG C2 and having pcm 5.1 dropouts from PS5 in HDMI 3 and 4. Moved PS5 to HDMI 1 so far no dropouts. Having contacted LG support bout this issue and this forum, I have had LG response:

"I am just getting in contact as our Technical Team has responded on file and have advised that there are no differences in the HDMI ports and so there should not be any reason as to why HDMI 3 and HDMI 4 would be different to HDMI 1. They have advised that we can book this in for a repair as this could be an issue with the HDMI 3 and 4 ports themselves."

So am now booked in for HDMI repair.

Waste of time IMHO, your TV behaves exactly the same as any other LG TV of its model.

It works “as intended”, the problem is that the “as intended” is faulty.

It almost seems to infer that the LG Technical Team are aware of a hardware issue with that TV model. I would have the repair and just see what happens after that.

It really doesn't, but agreed, if LG are willing to commit some visible effort into trying to isolate this fault then worth pursuing. If they have prepared a h/w HDMI fix for C2, don't fancy the chances of it being back ported to C1/CX.

X

xlcoolj

Contributor II

LG C2 and having pcm 5.1 dropouts from PS5 in HDMI 3 and 4. Moved PS5 to HDMI 1 so far no dropouts. Having contacted LG support bout this issue and this forum, I have had LG response:

"I am just getting in contact as our Technical Team has responded on file and have advised that there are no differences in the HDMI ports and so there should not be any reason as to why HDMI 3 and HDMI 4 would be different to HDMI 1. They have advised that we can book this in for a repair as this could be an issue with the HDMI 3 and 4 ports themselves."

So am now booked in for HDMI repair.

Waste of time IMHO, your TV behaves exactly the same as any other LG TV of its model.

It works “as intended”, the problem is that the “as intended” is faulty.

It almost seems to infer that the LG Technical Team are aware of a hardware issue with that TV model. I would have the repair and just see what happens after that.

It really doesn't, but agreed, if LG are willing to commit some visible effort into trying to isolate this fault then worth pursuing. If they have prepared a h/w HDMI fix for C2, don't fancy the chances of it being back ported to C1/CX.

Will give the LG repair team a chance. As it is strange that the 5.1pcm works fine on hdmi 1 for the last week where in hdmi 3 for the last 3 months I've had to resort to 7.1pcm as the pauses in 5.1pcm have been very annoying. Had the same on hdmi 4 but only tested for a few hours but it was immediately stuttering.

Y

yofalat611

Enthusiast I

LG C2 and having pcm 5.1 dropouts from PS5 in HDMI 3 and 4. Moved PS5 to HDMI 1 so far no dropouts. Having contacted LG support bout this issue and this forum, I have had LG response:

"I am just getting in contact as our Technical Team has responded on file and have advised that there are no differences in the HDMI ports and so there should not be any reason as to why HDMI 3 and HDMI 4 would be different to HDMI 1. They have advised that we can book this in for a repair as this could be an issue with the HDMI 3 and 4 ports themselves."

So am now booked in for HDMI repair.

Waste of time IMHO, your TV behaves exactly the same as any other LG TV of its model.

It works “as intended”, the problem is that the “as intended” is faulty.

It almost seems to infer that the LG Technical Team are aware of a hardware issue with that TV model. I would have the repair and just see what happens after that.

It really doesn't, but agreed, if LG are willing to commit some visible effort into trying to isolate this fault then worth pursuing. If they have prepared a h/w HDMI fix for C2, don't fancy the chances of it being back ported to C1/CX.

Will give the LG repair team a chance. As it is strange that the 5.1pcm works fine on hdmi 1 for the last week where in hdmi 3 for the last 3 months I've had to resort to 7.1pcm as the pauses in 5.1pcm have been very annoying. Had the same on hdmi 4 but only tested for a few hours but it was immediately stuttering.

Yeah, I wouldn’t read too much into it either. Probably just a standard response from local LG support. As you are under warranty, they are willing to take a look at your TV. They probably don’t even know that this an issue specific to the Sonos Beam Gen 2 only.

If it’s home service, then you’ve got nothing to lose. But if you have to send the TV to them, I personally wouldn’t bother as it’s a high risk (they could damage the TV), low reward play. In my country, repair is limited to basic diagnostics and part replacement. They don’t tinker. Last resort, they simply replace the TV. And I doubt a simple part/TV replacement would do anything.

Y

yofalat611

Enthusiast I

I’ve been running my ATV4K Gen 3 on HDMI1 for the past 3 days with no issues. Although there have been reports that HDMI1 also bugs out, it does appear to be more resistant. So there’s probably a lot of users who don’t realize that they are actually affected by this bug because they play their content on HDMI1 (it is port 1 after all lol).

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