Sound delay from TV speakers (1 Viewer)

wabbleknee

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Jul 10, 2011
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Got a new LG OLED that for all purposes, I am listening to it thru the TV build in speakers. Problem is that to aid a hearing loss, I used the audio out from the cable box to connect to Sennheiser wireless transmitter to my headphones. I believe the audio I am hearing is real time, yet the sound from the TV speakers is delayed 1/4-1/2 second. No receivers/amps are involved. The LG TV has a sound adjustment to sync voice to audio but nothing else I can find. Previous TV, same configuration did not have this problem. Suggestions appreciated. Tx
 

jevans64

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There should be a setting titled AV Sync with 16 levels of adjustment. Not sure of the millisecond range or whether it goes both negative or positive. You'll probably have to fiddle with it to get it close. It had been a while, but I think it is... Settings, Sound, AV Sync, AV Sync Adjust, TV Speakers. You'll have to use the arrow buttons to turn it on then adjust it plus or minus until it looks right. Lots of trail and error when they could have just provided a slider scaled in milliseconds.

If your TV can access YouTube, there are several sync adjustment videos to choose from. Makes the process a lot easier.
 

wabbleknee

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Jul 10, 2011
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Thanks for your reply. This is what the description is of AV Sync Adjustment (From Menu on tv), "Adjust audio timing to synchronize video and audio". That adjustment is from +15 to -2. The problem is not sync between audio and video, it is perfect by the way, but rather the "audio" out of my headphones and the audio out of the TV speakers. i.e. If somebody said "Hello", and I hear it on my headphones, about ~1/2 second later the word "Hello" comes from the TV speakers. It sounds like an echo, or hearing the word "Hello' from a huge empty Hall. In case it matters, cable box to TV is HDMI cable, 2 new "high speed" cables on the way.

This boggles my mind, the only external audio out from the tv is optical. I thought originally that taking audio from the TV (vrs cable box) that the sound would be in sync and "fix" the problem. Headphone transmitter has no optical in, only RCA type or mini jack.

Just as a comparative test in the last 15 minutes, on my 32" Samsung TV, using the same headphones/transmitter etc, the sound of "Hello" was in perfect audio sync. My conclusion is that the LG TV is delayed? about ~1/2 second and I don't sure how to cure it. Tx for any suggestions.
 

wabbleknee

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Jul 10, 2011
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Yes I have tried just about every combination of sound options, the delay remains the same. Instead of using the headphones out of the RCA type connector, I took them out of the picture altogether. I inserted my sound bar and used the RCA audio to the audio in, no difference. I likewise connected optical cable from the cable box to the sound bar with the same problem. I am convinced that the TV has a built in delay of some sort and can't get around it. I emailed LG about it and they want to talk to me tomorrow (monday) and will have to see what they say.
 

wabbleknee

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Jul 10, 2011
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So I spent Tuesday and Wednesday on the phone with LG VIP support for at least an hour each. I changed settings and connections ect, cable box, hdmi cables in different ports on the TV and at the end, could not come up with a solution. LG guy said he is out of options. Went to Best buy today and there was an LG guy there that talked to me at least an hour going thru various settings etc. He has never heard of that problem, but also said not many people listen to their TV thru headphones. If only this TV had a RCA type audio out, I think that would solve it but, of all the brand name TV's in the store, only one had RCA type audio out. It was the Vizio. I guess I am SOL. :-(
 

harshness

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If only this TV had a RCA type audio out, I think that would solve it but, of all the brand name TV's in the store, only one had RCA type audio out.
Processing delays are how things are in digital television. I must admit that I missed that you were using the RCA jacks on the cable box. I'm not at all surprised that the cable box analog output leads the TV as that happens before the video processing hardware does its thing to the time domain.

Does the TV have any outputs whatsoever (remember that you've thus far kept us in the dark about the specifics of the TV itself)?

Monoprice and Amazon both offer a number of ways to get from Toslink to RCA or 3.5mm jacks. This little guy will convert from optical or digital coaxial to RCA and headphone jacks (this assumes that the TV has a digital sound output):

Amazon product
 

wabbleknee

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Jul 10, 2011
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It is an LG OLED55C6P that only has one optical output. I was searching earlier and found the 1 to 3 optical splitter and a optical to analog (RCA) adapter (L&R channels). Reading the reviews on these items I was amazed at how many people are fretting over hooking up their new 4k TV's to their old AV receivers/sound bars/headphones etc. Most of their older equipment does not have optical or hdmi inputs, mainly analog, some digital coax etc. My 5 year old AV receiver ONKYO is useless to me now. I am hoping these adapters will work and put it back into operation. In numerous hours experimenting I found out that one option on the LG for sound "Internal speaker and optical output" would only work when I change the option from "AUTO" to "PCM" That took care of the delay but leaves no option for headphones. Another reason for these adapters. But yes you are right, digital processing does take some time. I turned on my samsung in another room with the headphones connected to the analog audio out, walked to the other room where the Lg is and even thought the LG video and audio and sound bar are in sync when set to PCM, it exhibits a delay in comparison to the 2 year old Samsung. Never dreamed that getting a simple thing like headphones to work would turn into this. Tx for reply
 

harshness

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I turned on my samsung in another room with the headphones connected to the analog audio out, walked to the other room where the Lg is and even thought the LG video and audio and sound bar are in sync when set to PCM, it exhibits a delay in comparison to the 2 year old Samsung.
As part of my volunteer activities I occasionally find myself running a four-source instant replay machine (Zplay) and there's a delay of a good portion of one second between the inputs and outputs. I get the frustration of the delay.

Just be happy that there is a provision for adjusting the delay; it hasn't always been that way.

I see where the firmware was updated at the end of last month and the documentation was updated yesterday. Make sure you have the latest.
 

wabbleknee

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Jul 10, 2011
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I threw out my O-scope several months ago but was thinking that I "should" try to set up a couple of Mic's on both outputs and measure the delay. :) I would rather have something solid to measure it rather then trying to listen to it be ear especially when I make adjustments. I might investigate one of those software o-scopes for your computer to do it anyways?? Some of the big box stores that have tv's on the same feed will have an echo effect. Yes the firmware is up to date, but did download the new manual. Tx for reply..
 

harshness

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I threw out my O-scope several months ago but was thinking that I "should" try to set up a couple of Mic's on both outputs and measure the delay.
Audio processing typically doesn't feature/demand delays so what the TV sends should be in sync with the picture (and the TV's speakers). If it isn't, the TV's internal synchronization feature should be able to advance or retard the timing relative to the picture to compensate; something it couldn't do relative to an external video source.
 

wabbleknee

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Jul 10, 2011
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Problem solved. I bought a 1 in to 3 out toslink spltter. I also bought a digital (toslink) to analog (RCA) adaptor. Connections are TV toslink out to Toslink splitter, one output to sound bar, one output to AV amp and the third output to the digital to analog adapter. The headphones plug into this adaptor (RCA) and transmit to RF wireless headphones. Perfect full sound without any delay between TV speaker on all connections, just as it should be.
 

Tampa8

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Problem solved. I bought a 1 in to 3 out toslink spltter. I also bought a digital (toslink) to analog (RCA) adaptor. Connections are TV toslink out to Toslink splitter, one output to sound bar, one output to AV amp and the third output to the digital to analog adapter. The headphones plug into this adaptor (RCA) and transmit to RF wireless headphones. Perfect full sound without any delay between TV speaker on all connections, just as it should be.
Nice, may help someone else that finds the problem.
 

Foxbat

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I came on this late, but I've seen where the digital image processing being done in the TV set delays the image on the screen by up to a second. If you go into a BigBox store with a wall of HDTVs all driven from the same source, chances are good you will see screens that change scenes after other screens have changed.

A similar thing happened to a friend of mine (also with an LG, but a 39" LCD) who was complaining that the words and the mouths of the newscasters were out of sync. Since the U-Verse box was patched into a Denon AVR and then to her LG's HDMI input, the delay in processing the picture had to be adjusted in the Denon by increasing the delay.

Glad you got it sorted out!
 

harshness

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Since the U-Verse box was patched into a Denon AVR and then to her LG's HDMI input, the delay in processing the picture had to be adjusted in the Denon by increasing the delay.
As there are more and more digital televisions in use, this method is probably going to have to go away sooner than later. It is unfortunate that the most expensive equipment gets the auxiliary sound outputs as they're really only appropriate with analog TVs.
 

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