Best answer by Ubergezza
Thanks guys. That was a setting I needed to change so will wait and see if I don’t experience that again. Cheers
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Loud Short Buzz Coming from Beam after TV is turned off
Just bought a Beam & LG C8 TV, so far they are both working beautifully with the exception of the loud noise I'm getting once I turn the TV off. It's very inconsistent, sometimes it happens 10 - 60 seconds after the TV is turned off other times not at all. I'm connecting the beam through the HDMI ARC port and using the supplied HDMI cable provided by Sonos. This doesn't happen with the built in TV speakers. Anyone experiencing anything similar?
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Pogi - Thanks a lot, problem solved with closing Netflix on my Apple Tv before turning of the tv. GREAT! Thanks again Pogi! 
On your settings for lg tv you have an option to have a tone when your tv is turned on or off ,you have to turn that tone to off, it is the lingering data noise that creates the buzz. Also if you leave Netflix on but turn TV off you will get that buzz to. Sorry but I won’t have TV access for a while, so I can’t get to specific about turning the beep off. Google can help u for turning the on off beep for LG TV. . Hope this helps
Pogi - I don’t understand exactly how to do it, can you explain it to a slow dude like me? 
Thanks! 
My setup: LG C8, Sonos beam and Apple TV 4K.
Thanks! My setup: LG C8, Sonos beam and Apple TV 4K.
I had the same problem, I fixed my buzz noise by turning off the power down beep or tone associated with turning off my LG TV. since I did that no more buzzing has occurred . The quick reply from Sonos help made me think about the power down beep as they mentioned that some audio data was still being received when turning off TV. Hope this helps
I have the same issue with my LG C8 hooked up to a Sonos AMP. It’s happening at random.
Note that in all of the resolved cases of this issue, it has been the TV sending an errant signal to the Sonos.
There are are unresolved issues as well, but so far, there’s been no indication that it is a Sonos issue in terms of either their hardware or software.
There are are unresolved issues as well, but so far, there’s been no indication that it is a Sonos issue in terms of either their hardware or software.
Same issue with LG tv
when I turn off tv after watch Netflix(in tv app), this issue will happen
when I turn off tv after watch Netflix(in tv app), this issue will happen
+2
mine just buzzed too, diagnostic report: 1413397937
Same issue I have had my Beam and & LG tv for 6 months and it has happened three times. After you turn off the tv a few mins later a very loud noise!
Same here, with LG C8 (firmware 4.10.55) Harmony One and Sonos Beam. Happens after turning TV off, sometimes 5 seconds after, sometimes 15 minutes after, randomly and infrequently (twice last week).
Suggested fix above does not solve the issue, but seems to have made it much less frequent.
Suggested fix above does not solve the issue, but seems to have made it much less frequent.
+1
Back to report the suggested fix does not work. This sound is extremely loud and happens once the TV is turned off. Is there a fix coming for this? There’s no way this is LG’s issue as I have another LG with a playbar and it’s never happened. It’s the Beam. Please Sonos release an update to address this it’s Soooo loud and scary like something is severely broken with the Beam
You may want to check with LG. From the other posts about this issue, it appears to be an extra signal being sent by the TV to the Sonos, and not something generated by the Sonos on its own.
+1
This sound is frightening. I just got a beam with 5.1 and LGOLED B8. My kid turned off the tv and it scared us. Is this on the agenda to be fixed? I haven’t tried the suggestion yet but it sounds like it doesn’t work for everyone and may be sporadic?
I have this issue with LG C8 — it can be VERY loud, the people living above me love to complain about noise. I need a solution.
My Beam does the same hooked up to an LG E8 does the same Mr Sonos, heard it tonight and wife said it's done it a few times now. Tried the Simplex fix will wait and see if that works.
I get this every now and again. I have had my Beam for about a month and it has happened maybe 3 or 4 times. I have the beam connected via HDMI ARC to a brand new LG B8.
Yes I have this too, a few seconds after turning the TV off I get a loud sudden buzz for a couple of seconds from the Beam. My TV is a LG SK8500. I have tried turning off the auto sync power setting but it makes no difference.
Same issue. Tried the reommendation re turning of power synch but still happening.
+3
Same problem here. Also with an LG C8. Doesn’t happen very often though.
Same problem here
Thanks guys. That was a setting I needed to change so will wait and see if I don’t experience that again. Cheers
I think that's the first time I've seen a solution posted for that issue. Thank you!
I’ll have a look through settings on the TV and see how mine is fixed. Thanks for the suggestion.
Thanks! I actually think I found a solution (so far no buzzing). Under General->Simplink(HDMI-CEC) TURN OFF (Auto Power Sync). This doesn’t need to be on since the Sonos never really turns off, this signal is essential doing nothing.
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