Question

New LG TV's and 5.1 pass through

  • 23 February 2015
  • 65 replies
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I know this is a recurrent topic, but I actually believe it would be very helpful if Sonos address this issue in a concise webpage with continuous updates. Right now the whole forum is full of questions about TV's ability to pass-through a 5.1 HDMI signal. The (so voted) most helpful comment on amazon about the playbar is about the problem of not getting a real surround but an artificial constructions from a PCM 2.0 signal from the TV. And this is also the main issue mentioned in CNET for the review of the playbar.

So, guys, could you make a systematic and compressive study/review of which TV's will work with the Sonos surround system? I'm currently considering to get a full sonos surround pack, but I cant not make a decision before knowing if my LG 65UB930T (LG65UB9500 in USA) is able to pass the signal form the devices connected to the HDMI ports. And I believe this situation is generalized for all potential consumers, many of them buying your product without being aware of the issue with the 5.1 signal. 

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65 replies

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I own a LG65UB9500, and the TV forwards and plays Dolby Digital 5.1 from HDMI sources.
If your source however plays DTS, TrueHD, etc., the playback device like BluRay player or console has to take care of the upstream conversion, or the TV's audio format has to be set to PCM.

Hope this helps.
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This is a handy webpage that shows the audio pass through capabilities of some TV's.
http://www.rtings.com/tv/tests/inputs/5-1-surround-audio-passthrough
I have an LG OLED55B6P and it passes through 5.1 no problem.

We're any additional steps required to get this working with your 2016 LG OLED TV?

I have the Oled65b6p and this is the only shimmer of compatibility that I've been able to find. Interested in Sonos, but have not purchased yet.


I can confirm that the OLED65B6P DOES support 5.1 pass-through. It required going into settings --> Sound --> then setting the "Sound Out" option to "LG Sound Sync (Optical)" and then setting "AV Sync Adjustment" to "On" and enabling "Bypass". After this, I got 5.1 fine from an Xbox One S (configured with bitstream output via HDMI and Dolby Digital Surround.


2 corrections:
1. The LG must be set to 'Audio Out (Optical/HDMI ARC)' with the optical set to 'Auto', not the LG Sound Sync option.
2. The Xbox must be on Dolby Digital, not DTS.

With bypass enabled per the above, the Sonos controller app should now show 'Dolby Digital 5.1'.
I mentioned this in another thread, but I have a 65 inch OLED EG9600 model.. Both this and the flat version (EF9500) can pass DD 5.1 from external HDMI sources as well as from internal apps, however from the factory the setting is off.

For internal apps, you must go into sound settings and under format, and change it from PCM to auto and it will send 5.1.

For HDMI connected devices, in order for the TV to pass DD 5.1 you will need a service remote. In the EZ Adjust menu go to tool option 7 and change the EDID setting from PCM to AC3. TV will reboot and you will have full 5.1 pass through. You will still need to solve the DTS conversion to DD 5.1 issue separately. PS3, PS4, and XBOX One supposedly all solve that issue.
I have fixed this problem on my LG 55LA690V-ZB TV. Basically I wrote to LG support and they sent me the following settings and it now works fine.

From LG support
The Sound Out settings, I would suggest ensuring the AV Sync Adjust is turned on, as well as Bypass.
I would also check that the Sound Output is set to Auto and not PCM, as PCM is limited to 2.1 Sound Output.

It didn't work until I ticked the Bypass box then it worked fine.

Hope this helps
Chris
Ziptbm,

THANK YOU!!!!

I've been trying to get this working for hours! You nailed it! Can't even imagine how much time I would have spent trying to figure it out. Confirmed and working like a charm!
Hey, just signed up to say that there is a website doing this kind of testing on most of the TV's that come out. I will post the link here because I think it would be helpful.

Link: http://www.rtings.com/tv/tests/inputs/5-1-surround-audio-passthrough

Edit: Looks like someone beat me to it. Weird, for some reason my ad blocker wasn't showing the rest of the comments.
I got a new LG OLED 65” TV a few weeks ago, and this has been driving me nuts. I have a Sonos Playbar, with surround speakers and sub, and an 4K Apple TV. The sound would sometimes be fine, and sometimes it would just go mute. It would typically start happening when i tried to play something in 4K HDR 5.1 from Netflix. Once the sound went away, there was nothing i could do would fix it, except to go to one of the LG internal apps, like Netflix and Amazon, and play something. After that I could go back to the Apple TV (on HDMI 2), and things would play fine. For awhile.
When the sound would go away, if I looked on the Sonos app, it would say Unsupported TV Audio. I read everything on these boards, and tried fiddling around with the various Sound preferences in the LG menu. Nothing seemed to make much difference, but I settled on having the sound Sound Out through Optical, with the Sound Out set to Auto. I also set AV Sync Adjustment to Bypass. But again, this didn’t seem to make much difference.
I finally tracked down a way to reproduce the symptoms: If I watched regular TV (actually a TiVo), and then switched to the ATV on HDMI 2, and tried to play a 5.1 video, sound would go mute. After that, I could go back to TV, and it would stay mute, until I did the fix I described above. However, if I went from TiVo to ATV and played a regular video without 5.1, everything would be fine.
Powering off and on the TV made no difference. However, I finally realized that the TV was set to QuickStart+ (in the General menu). When i turned that off, cycling the TV power restored the sound. Oh, and by the way, i now see Dolby 5.1 on the Sonos App.
So that’s what I now do: i keep QuickStart+ off (it takes a couple of extra seconds to turn on the TV), and then everything always works fine, EXCEPT if I switch from TV to ATV and start watching a 5.1 video. If that happens, i just have to power cycle the TV, and i programmed a macro on my Harmony remote to quickly do it.
I think this is an LG/SONOS issue, not Apple. I have the same behavior with a Roku 4K.
Hope this helps.
OK, so i searched for LG software updates and found the update at http://www.lg.com/us/support/software-firmware-drivers . I downloaded onto a USB stick and updated it manually, and it looks at first glance that it did solve the problem. I'll check it out a bit more later today.

Thank you very much for letting me know. I have no idea why the TV was reporting no new updates. I see the date of this update is 12/12. Maybe they're doing a rolling deployment so as not to overwhelm their servers? In any case, i think this does work.

One tip, for any person trying to do this on a Mac: make sure your USB stick is formatted as an MS-DOS (FAT). You can do it under Disk Utility. I originally had a stick formatted as a Mac disk and the TV didn't recognize it.
I had very similar problems - I was complaining more about distortion that starts after a while, but I am having problems where the sound drops out too. I was able to confirm with LG support that the problem with the LG Digital Optical Out.

Here is what I just posted on tomsguide website

2017 LG OLED TV TOSLINK Digital Optical Out distortion

2017 LG OLED65B7P TV TOSLINK Digital Optical Audio Out has KNOWN distortion issues - CONFIRMED with LG Support on January 30, 2018.

My setup:
Directv hdmi -> TV -> Digital Optical Out -> Sonos Playbar
I have the TV sound in Auto mode (not in PCM) so 5.1 surround can work.

When I first turn everything on, the sound is fine.
After 10-30 minutes, strange distortion comes in after sound.
So in a tv show with dialog, every time someone stops talking (sound briefly drops) there is some strange distortion for 1-2 seconds.

Turning the tv and cable box off and back on temporarily fixes the distortion (but is a pain in the ass in the middle of a movie).

I went through support with Sonos and we determined that the problem was not the Playbar.

I went through support with LG and they CONFIRMED that this is a KNOWN problem with the tv digital optical out and that they are working on a fix but they could not say when the fix would be done.
I am posting this here so others can know that this is a confirmed problem with the LG TV software and/or hardware on the OLED65B7P.
I do not know what other LG TVs may have the same problem.

The fastest way to make the distortion go away without having to turn off the TV and video source - Settings/Sound/Audio Out/Digital Sound Out
Change the setting to PCM and then change the setting back to Auto and the distortion immediately stops - though it will come back again after another 10-30 minutes.

This problem would affect ANYTHING connected to the Optical Audio Out
So ANY soundbar or audio system that uses Optical input from the TV will have the same problem.

I think that if you were to leave the sound in PCM mode that the problem would probably go away too, but then you would lose all 5.1 surround sound info and instead get only left and right audio.

I will reply here when/if LG fixes the problem.
If they do not fix the problem soon, I will be returning my tv before the warranty runs out.
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Getting the newer LG OLED65C7P, and just got my 5.1 components, play bar and play 1's. Hoping LG took care of these issues!!!!
I have the same TV and it works perfectly with the Playbase, gets stereo or 5.1 depending on the source, have never had any dropouts or sync issues (TV v. 04.70.36, Apple TV 4K as source). You just need to fiddle with the TV's settings a bit. Sound Out > Audio Out (Optical/HDMI ARC), AV Sync Adjustment > Off. DO NOT program an external source's remote (like Apple TV, Roku, etc.) to control the C7 first because if you do, when you put in the Sonos you'll get the "no entry" icon popping up on the screen every time you adjust the tv's volume with the other remote. Program that remote for the Sonos directly if possible.
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Many thanks Bernhard! that's very useful, I have been looking for that information for days. I wish that information was included in the manuals/specifications of the TV's.
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Ok, in case this is useful for someone else; I finally bought the Sonos system and I can confirm my TV PASS THROUGH the 5.1 signal form HDMI to the optical out, providing real surround to the SONOS system, and this is probable true for all LG XXUB9XXX TVs since all of them have the same technology.

As Benhard mentioned, the TV just pass the signal without modification, so you need to configure your HDMI devices (XBOX, PS, Bluray Player...) to output 5.1 Dolby.
I have an LG 58UF830V and it passes 5.1 through. nice
Does anyone know if a LG 55LW5600 passes true 5.1 through the digital output?
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so a similar question from me: I unpacked my 65EF9509 yesterday and I noticed that PLEX APP (Xplay) seems not to provide 5.1 and also my first trys with 4k content from Netflix and Amazon Prime did not play in 5.1. on the Playbar. So what is your experience so far?

passing 5.1 from external devices will be fine (if it will work - I will try that later) but the future is streaming the content from Netflix & Co. and so there is no possibility to influence the upstream conversion while you stream directly to the LG

Peter
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so a similar question from me: I unpacked my 65EF9509 yesterday and I noticed that PLEX APP (Xplay) seems not to provide 5.1 and also my first trys with 4k content from Netflix and Amazon Prime did not play in 5.1. on the Playbar. So what is your experience so far?

passing 5.1 from external devices will be fine (if it will work - I will try that later) but the future is streaming the content from Netflix & Co. and so there is no possibility to influence the upstream conversion while you stream directly to the LG

Peter


There will likely be a setting in the audio menu of your TV to output audio in DD5.1. When watching a program on an app (say Netflix) that you are fairly sure will have DD then if you aren't getting that on your Playbar check the audio out settings on your TV menu.


On my TV the DD output option was greyed out until I actually had a DD5.1 source
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I can give me the answer myself: LG passes perfect 5.1 in Dolby Digital,Dolby Digtal Plus, AAC and also in MPEG.

BUT after selecting that in the preferences I got a lot of Audio dropouts :-((( very, very bad. in an other thread here in the forum is that problem heavly discussed. Since about 2 years!! and it seemed not to be solved :-(((

ist there anybody having the same problems and solved that?
thanks for your help

Peter
P.S. its definitly not the LG! I tried the same Movies streamed from my fire TV and got the same dropouts
I mentioned this in another thread, but I have a 65 inch OLED EG9600 model.. Both this and the flat version (EF9500) can pass DD 5.1 from external HDMI sources as well as from internal apps, however from the factory the setting is off.

For internal apps, you must go into sound settings and under format, and change it from PCM to auto and it will send 5.1.

For HDMI connected devices, in order for the TV to pass DD 5.1 you will need a service remote. In the EZ Adjust menu go to tool option 7 and change the EDID setting from PCM to AC3. TV will reboot and you will have full 5.1 pass through. You will still need to solve the DTS conversion to DD 5.1 issue separately. PS3, PS4, and XBOX One supposedly all solve that issue.


HI - what is a service remote? I will send input using a ROKU via HDMI to the TV .. and via optical digital out to the Playbar. So to get true 5.1 I need to 1. change LG tv setting to output Digital 2. roku setting to 'auto' output and 3. anything more? And how can I tell I am finally listening to 5.1 not simulated 5.1? Appreciate the clarity in this thread. About to buy EF9500 and wanted to seek this level of knowledge before jumping in.
Sorry I don't know much about the Roku but I can assure you that the EF9500 will send 5.1 audio through optical using the internal apps right out of the box.

As for the hdmi connected sources, yes you will need a service remote. It's a remote that technicians use to access the service menus. You can buy these, or emulate a service remote using a logitech harmony remote. In my case, I didn't have the patience to program a harmony remote, so I simply called LG tech support and asked for a tech to come to my house to help me access the menu. they were more than accommodating.
A big thank you to Johnny5Alive for making it clear that the LG 65EF9500 is set to pass through the 5.1 signal from an HDMI source. I was confused, howeveer, about the need tor a service remote to change settings on HDMI connected sources. Could he explain what sources he is referring to. At present, I only have a Verizon FiOS cable box and a SONY Blu- Ray player connected by HDMI to the TV. Do I need to change settings on these sources?
Okay to be clear, your LG will not take a 5.1 audio signal from anything connected to any hdmi port and pass it to the optical out. It can be enabled through the use of a technicians remote. If your source setting (Blu ray player, cable box etc) is sending the 5.1 audio then your TV's internal settings must be accessed by the technicians service remote to enable the pass through of that signal to the optical port. Otherwise it will be down mixed to 2 channel stereo.
Thanks for clarifying that for me. In the event that LG declines to send a technician to my home, can you tell me what I would have to do to a Harmony or other universal remote in order to emulate an LG service remote?
If you google LG service remote harmony remote there are various sites with instructions. As I said it sounded like a pain so I just called LG. They were happy to send a tech to my home with the remote. I advise you to read my previous post to find the right menu as my technician didn't know where it was.
Thanks again for your helpful and prompt replies. I hope you are enjoying the LG OLED TV as much as the Sonos sound system.