I recently purchased an LG 37" LCD HDTV (37LC2D) that came with a 5.1 home theatre system (LH-T9654MB) and I'm having issues connecting the DVD player / receiver to the TV via an HDMI cable. When the HDMI cable is plugged in, it causes the audio not to be sync'ed with the video, regardless of the input I select. For example, if the HDMI cable is plugged in, if I switch on my Xbox 360 (which is running off of component cables for video and RCA for audio), the audio will be lagged, or if I switch on my digital cable box (component + RCA), the audio will still be lagged. The problem fixes itself, usually, if I turn the dvd player / receiver off and back on again - it will re-sync itself.

I've tried both a $140 Monster 400 HDMI cable and a $20 no-name HDMI cable from eBay, and both have the same issue. If I unplug the cable... no sync issues at all. So this would lead me to believe it's not the cable, but rather, either the connection on the TV or the connection on the dvd player / receiver.

Is this audio-sync issue normal with HDMI cables? Have you ever heard of this before? What could be causing the delay? Any help would be greatly appreciated :).

*bump*

Hi,
I just got a 42LC2D and have noticed a similar audio problem. I had the LG and another TV hooked up to the same source (HD cable box). The LG audio lagged by 1/4 or 1/2 a second, creating an echo affect between the TVs. I am not using HDMI but the problem seems to be with any input (composite, component etc). You can try this yourself...run the audio out to a stereo AND to the TV and the TV will lag (at least mine does). This is troubling but not sure it is bad enough to return the set. It appears that the LG has an internal audio delay for its speakers? Turning on/off etc does not seem to fix my problem.

Hmmm… the only I/F I get a delay on is the HDMI.

Has anyone else experienced this problem or know of a solution?

weird...i have a 6$ 15foot hdmi cable and it works beatifully

And you have the same TV / receiver?

i have the exact same thing, i have audio delay on only some of the hd channels that i'm receiving through the cable box. if i sent the audio directly to the receiver then the audio is in sync, but if i send the audio to the tv and use the tv speakers, then it's out of sync. But this is only a problem with certain hd channels. it is connected with component video, no hdmi.

Doesnt this have to do with the version of HDMI? I thought 1.1 was prone to lip sync issues. It was fixed in 1.2 or 1.3.

i'm not even using hdmi and i have the issue

It sounds like there is a bug/feature in the TV, where it "fixes" the lip sync issue by delaying sound when the source is HDMI (or something like that) -- only, it believes there's always HDMI when the connector is there. Maybe this is not at all the real reason, but I'd check with the tech support for your TV manufacturer if there is a firmware upgrade available.

jwatte... very anxious for your reply re. sync issue and 37lc2d

Sorry, I don't know more than I posted about that specific issue.

Hey, I'm following this with great interest. A couple days ago I purchased the same setup for my mother's place. Yesterday i went over to check out this "issue" she was having, turns out to be the same as described below.

I've hooked the HDPVR box from Rogers, to the LG TV via component & RCA. Taken the audio out from the Rogers HDPVR and connected it to the LH-T9654MB via RCA into AV1. The LH-T9654MB is connected back to the TV via HDMI.

Depending on channel, there is clearly an audio delay when selecting AV1 and listening to the HDPVR through this system. No issue when using the built-in TV speakers.

So from what Mhaddy says below, If I connect the LH-T9654MB unit to the TV via component, and ditch the HDMI cable, I should have no audio-sync issue?? Will try tonight, any other thoughts would be greatly appreciated!


I recently purchased an LG 37" LCD HDTV (37LC2D) that came with a 5.1 home theatre system (LH-T9654MB) and I'm having issues connecting the DVD player / receiver to the TV via an HDMI cable. When the HDMI cable is plugged in, it causes the audio not to be sync'ed with the video, regardless of the input I select. For example, if the HDMI cable is plugged in, if I switch on my Xbox 360 (which is running off of component cables for video and RCA for audio), the audio will be lagged, or if I switch on my digital cable box (component + RCA), the audio will still be lagged. The problem fixes itself, usually, if I turn the dvd player / receiver off and back on again - it will re-sync itself.

I've tried both a $140 Monster 400 HDMI cable and a $20 no-name HDMI cable from eBay, and both have the same issue. If I unplug the cable... no sync issues at all. So this would lead me to believe it's not the cable, but rather, either the connection on the TV or the connection on the dvd player / receiver.

Is this audio-sync issue normal with HDMI cables? Have you ever heard of this before? What could be causing the delay? Any help would be greatly appreciated :).

Hey Guys,

I just bought a 42LG30 and I'm having the same issue as well. I swapped the cable box and even ran it through component and cable settings; it seems to only apply to the HDMI function. I even replaced the HDMI cord and tried the other input...no dice. This seems to be an LG issue and I'm fairly confident I'm going to have to swap this out for a new set or give up on LG all together. Shame because picture is quite nice. If anyone finds any quick fixes for this please post back.

LG 37LC7D connected via HDMI to Comcast DCT3416 HD DVR with lip-sync issue.

Audio is out of sync when going through HDMI cable and is in sync when using the compoent audio to a seperate audio system.

After several attempts to talk to someone who could speak english and bothered to really try to help me, finally talked to a service technician who is sending me a firmware fix for the audio sync issue. They would not make it available to me for download and are sending it to me on a usb stick. I should have it in 5-7 days and will try to re-post with the results.

If you want to try giving LG a call (800-243-0000) and refer to case # C09010579523 it might save you some time in explaining the issue, however if your LG is a different model the "fix" might be different.

STinGA

LG 37LC7D connected via HDMI to Comcast DCT3416 HD DVR with lip-sync issue.

Audio is out of sync when going through HDMI cable and is in sync when using the compoent audio to a seperate audio system.

After several attempts to talk to someone who could speak english and bothered to really try to help me, finally talked to a service technician who is sending me a firmware fix for the audio sync issue. They would not make it available to me for download and are sending it to me on a usb stick. I should have it in 5-7 days and will try to re-post with the results.

If you want to try giving LG a call (800-243-0000) and refer to case # C09010579523 it might save you some time in explaining the issue, however if your LG is a different model the "fix" might be different.

STinGA


Please update us asap. I just bought a 42lg30 and might have to return it due to audio sync problems with QAM. I emailed CS last night, but it's probably too late since I have 7 days left to return it. I'll try calling tomorrow when I get to a phone.

Please update us asap. I just bought a 42lg30 and might have to return it due to audio sync problems with QAM. I emailed CS last night, but it's probably too late since I have 7 days left to return it. I'll try calling tomorrow when I get to a phone.

UPDATE... I waited until the 15th of January and after not receiving the promised update, I called LG and was told that they needed additional information on the model number of my tv before they could send the fix to me. They had my phone number, so why didn't they call me?? Oh well, anyway, I provided them the additional information and they sent me a usb stick with an update on it. The update was "homefs-37LC7D-UB-RELEASE-0x0306.pak". Had to wait an additional 2 weeks for it, hence the long delay before getting back to post this information.

I applied the update (after discovering that the update file has to be in the root and not in a folder on the usb stick) and I can tell no appreciable difference in the lip-sync problem. I emailed LG at the persons address listed at the bottom of the update instructions thinking that I would be lucky to get any reply (especially since it was on a weekend), but within 30 minutes my telephone rang and it was the LG technician! The technician quizzed me about my setup and whether the update did apply and the tv reset. Everything was done according to their instructions but the lip-sync issue still is there. The technician is going back to engineering to see if there is anything else that can be done to fix the problem. One comment that the technician made was that there have been some issues with particular Motorola DVR devices, one of which matches the model that I have from Comcast (DCH3416).

That's it for now. Sorry for the long post. I will post again if there are any future developments, especially if there ends up being a resolution.

I got 3 42LG30's yesterday, all with audio sync problems. Called customer service and told them to send me the updated firmware. After verifying that the TV's weren't stolen (had to provide serial number, who I bought them from, and date of purchase) I was told they would send me a USB key with the updated firmware. I should receive it within a week or 2 they said. Audio lag is bad on OTA antenna and RCA cables from cable box (don't have my HD box yet). But HMDI from AppleTV and DVD player has no lagging. Will post more after I get the firmware.

I recently purchased an LG 37" LCD HDTV (37LC2D) that came with a 5.1 home theatre system (LH-T9654MB) and I'm having issues connecting the DVD player / receiver to the TV via an HDMI cable. When the HDMI cable is plugged in, it causes the audio not to be sync'ed with the video, regardless of the input I select. For example, if the HDMI cable is plugged in, if I switch on my Xbox 360 (which is running off of component cables for video and RCA for audio), the audio will be lagged, or if I switch on my digital cable box (component + RCA), the audio will still be lagged. The problem fixes itself, usually, if I turn the dvd player / receiver off and back on again - it will re-sync itself.

I've tried both a $140 Monster 400 HDMI cable and a $20 no-name HDMI cable from eBay, and both have the same issue. If I unplug the cable... no sync issues at all. So this would lead me to believe it's not the cable, but rather, either the connection on the TV or the connection on the dvd player / receiver.

Is this audio-sync issue normal with HDMI cables? Have you ever heard of this before? What could be causing the delay? Any help would be greatly appreciated :).

Just a thought, is it possible your receiver is doing some sort of video processing over HDMI that it is not doing over analog cables? Excessive processing may be the cause of your sync issues. try disabling any noise reduction or upsampling over hdmi or whatever, see if the sync improves...

This stinks I was looking at this TV and thinking about buying it but now with these issues I wouldn't touch this TV at all!

Back in November of 2008, I purchased a 42LG30 from Best Buy (it came with a sweet bundle deal with an LG 5.1 surround sound DVD/stereo). I have always had problems with audio synch issues using both HDMI and Component cables with the TV. There is signifcant delay with my cable/dvr box, Wii and PS2. If I run audio directly from the cable box to the stereo (and bypass the TV), then I have no noticeable delay issues, however the video game systems continue to have delay issues. I only have one digital audio input on the stereo, so it's much more convenient to run everything into the TV and take the 1 digital output from the TV and run it to the stereo.

Anyway, about 2 weeks ago, I called up LG and explained the issue to them, and they said they've had numerous complaints with this issue and said they'd send out a software update on a USB Drive right away. It showed up about a week later, but unfortunately would not work with the TV. The USB input on the TV says "service only" (unlike the more expensive models, I can't view pictures and such with the USB input on this particular TV). I emailed them back and explained the problem and within about 3 days another USB Drive showed up in the mail...same problem.

I don't know what to do at this point, but I thought I'd share that I had the same problem as other posters, and tried to fix it as some of the other posters had done with no success. I'm still waiting to hear back from LG about the latest failure...if it ever gets fixed, I'll report back.

Never put a display between your audio source and your audio system. (AVR)

This definitely sounds like a processing issue. The TV is having problems processing the digital audio signal and getting it out the speakers fast enough. Are you guys using DVR cable boxes? Well, I guess that wouldn't matter if you are seeing it on different sources. (Sorry, thinking outloud here).

Its definitely an issue with processing the audio, especially if a receiver makes most of the problem go away. Don't a lot of receivers even have a delay setting where you can line up the audio/video better that you are pushing through it? I suspect the software and processing inside the LG just isn't handling it appropriately.

I'm curious to know if guys with other brand flat panels are having the same issues.

<smart arse response>Why are you using the TV speakers again?</smart arse response>

This definitely sounds like a processing issue. The TV is having problems processing the digital audio signal and getting it out the speakers fast enough. Are you guys using DVR cable boxes? Well, I guess that wouldn't matter if you are seeing it on different sources. (Sorry, thinking outloud here).

Its definitely an issue with processing the audio, especially if a receiver makes most of the problem go away. Don't a lot of receivers even have a delay setting where you can line up the audio/video better that you are pushing through it? I suspect the software and processing inside the LG just isn't handling it appropriately.

I'm curious to know if guys with other brand flat panels are having the same issues.

<smart arse response>Why are you using the TV speakers again?</smart arse response>

The issue is, I want 3 sources to have their audio run through the stereo, and I only have 1 Digital Input. So, my solution was to run all 3 sources into the TV, and then run one output from the TV to the stereo. What I really need is a new stereo, but since that's not going to happen, I'm sort of stuck. I can run the audio directly from the DVR Cable box to the stereo and avoid delay issues with television channels, but then my consoles will not be able to utilize the stereo.

And unfortunately, the DVR box that I have only allows me to delay the audio signal...which would serve to only make the problem worse.

Are they all the same type of connection? What about using splitters in reverse? They should work both ways. I would think you would just have to be careful of having more than one unit on at a time. Otherwise, you should be able to feed all the signals into one wire.

The other option would be to get a little switchbox for those signals. They have switchboxes that take all sorts of inputs. You could use that, in conjunction with your receiver, to select what you want to hear/see.

There's definitely a way to figure this out and to not use the TV for anything other than displaying your picture.

Quick google search result:

http://www.inday.com/da4x/da4x.htm

http://www.amazon.com/Recoton-Digital-Audio-Selector-Switch/dp/B000034D6G

http://www.impactacoustics.com/product_list.asp?cat_id=1002

http://www.ramelectronics.net/audio-video/a-v-switchers/c10000-c18000.html

Quick google search result:


Thanks for those. The DVR uses a Digital Optical output, the Wii uses Stereo ouput, and the PS2 can do either one (it's currently using a stereo output). So, what I might try doing is getting one of these cheaper splitters and using the Digital Optical output on the PS2, so the DVR and PS2 can have the best audio sharing the one Digital Optical input on the receiver, and then run extension cables on the Wii and run that directly to the single stereo input on the receiver. And then I can bypass the TV with everything.

They have some A/V splitters with digital and analog hook ups. Do a little more searching and I bet you can find the one you want. I do think this is a better idea than futzing with going through the TV.

They have some A/V splitters with digital and analog hook ups. Do a little more searching and I bet you can find the one you want. I do think this is a better idea than futzing with going through the TV.

For about $25, I was able to purchase a Selector Switch, a couple extra optical cables and a Jack to Jack adaptor for my RCA cable, and it fixed the problem. Since there is one Digital and one Analog input on my receiver, I used the selector switch to run both my Cable Box and PS2 into the same input, and then I used the Jack to Jack adaptor to run the RCA audio from the Wii through an extension cable (which I already owned) into the analog input.

This way I could just avoid the TV audio altogether, and it solved all of the synch issues. Thanks for the all the input. For anyone else running into this problem with this TV, this is what I recommend!

For about $25, I was able to purchase a Selector Switch, a couple extra optical cables and a Jack to Jack adaptor for my RCA cable, and it fixed the problem. Since there is one Digital and one Analog input on my receiver, I used the selector switch to run both my Cable Box and PS2 into the same input, and then I used the Jack to Jack adaptor to run the RCA audio from the Wii through an extension cable (which I already owned) into the analog input.

This way I could just avoid the TV audio altogether, and it solved all of the synch issues. Thanks for the all the input. For anyone else running into this problem with this TV, this is what I recommend!

Good to hear. Glad that worked out. And yes, to anyone else with this problem, use the TV for what's it meant to be used for...displaying video. :D

I have an Ilo (I think Toshiba is the mfr) TV from Walmart, about 2 years old. It is a 26" widescreen LCD HDTV with HDMI. I have a brand new JVC DVD recorder, DR-MV150B, and am having audio sync problems, only through HDMI. I run HDMI straight to the TV, as well as component cable. I also have an older DVD player attached via RCA cables. The sync issue is only with the HDMI. I have no home theater or any other components, besides my digital cable box (no DVR). I split the cable before the cable box, and run a direct line to the older DVD player. The line to the cable box then runs to the new DVD recorder, which is connected via both HDMI and component cable to the TV. With HDMI the volume is considerably louder, but about 1/2 sec. or less out of sync, and the picture is clearer yet darker.
My previous DVD recorder, a Panasonic without HDMI, had sync problems with component cable but not RCA.

Just purchased an Insignia NS-L46X-10A 120hz TV, amazing picture, but I am having the same AV sync problems which have been described in this thread.
I have been told that this model Insignia TV is made by LG.

Quote from WikipediA:

Examples of transmission broadcasting, reception and playback that can get the AV-sync incorrectly synchronized:

A video camera with built-in microphones or line-in may not delay sound and video paths by the same number of milliseconds. A video camera should have some sort of explicit AV-sync timing put into the video and audio streams. Solid state video cameras (e.g. CCD and CMOS image sensors) can delay the video signal by one or more frames.
An AV-stream may get corrupted during transmission because of electrical glitches (wired) or wireless interruptions - this may cause it to become out of sync. The AV-sync delay normally increases with time.
There is extensive use of audio and video signal processing circuitry with significant delays in television systems. Particular video signal processing circuitry which is widely used and contributes significant video delays include frame synchronizers, digital video effects processors, video noise reduction, format converters and MPEG pre-preprocessing.
The video monitor processing circuit may delay the video stream. Pixelated displays require video format conversion and deinterlace processing which can add one or more frames of video delay.
A video monitor with built-in speakers or line-out may not delay sound and video paths by the same amount of milliseconds. Some video monitors contain internal user-adjustable audio delays to aid in correction of errors
So is there a way to adjust the AV sync on this Insignia TV?

(BTW, unless you have a defective cable, the brand of HDMI cable which you use will not fix an AV sync problem)

EDIT:

If I listen to the audio directly from the Blu Ray player, through the analog RCA out jacks, while watching the TV using HDMI (and mute the TV audio signal), there is no longer an A/V sync problem. If I listen to the audio from the Blu-Ray AND the TV at the same time, I can hear the same words repeating more than once in an echo type manner.
This indicates that there is something within the circuitry of the TV itself that either delays or advances the audio signal to cause a synchronization problem. Stay away from this TV.

I just bought an LG 50PS30 and I am also having audio sync problems. I am connected with a BellExpressvu HD receiver with HDMI. Without thinking it could be the TV I called Bell with the problem and they sent me a new receiver. Same problem. Changed the HDMI cable, same. Changed connection to composite with RCA, same problem.

Finally googled the problem and found you guys. I called LG and they are sending a technician tomorrow. Asked for the firmware upgrade and guy told me they need to send a technician. Since I am not paying for this call I don't give a crap.

Will update you later with info from technician.

It could be that the better engineered TV's auto detect different HDMI signals more accurately, and make the appropriate adjustments for A/V sync.
With my particular situation/anomaly, watching the Insignia 46" 120 Hz TV, I tried 4 different DVD/Blu-Ray players, which all ended up having the same A/V sync problems:
So it had to be a problem with the TV, and not the incoming HDMI signal.

Well the tech passed today and he doesn't have a clue so he ordered a new processor (he called it a brain). So we will see when the part comes in.

In the meantime I think I will do some tests over the weekend. I will try to plug RCA cables from receiver to amplifier to see if the sync problems comes from receiver.

Someone told me that it could even come from broadcasters themselves since the problem does not occur on all channels or for that matter even different shows on same channel.

Sometimes there are A/V sync problems from improper video encoding/software issues involving the original A/V file's themselves, which has nothing to do with hardware, and can cause "some" broadcasts from an otherwise properly working station to have A/V sync problems, but most of the problems I've seen described in this thread seem to indicate some sort of product defect, and in the case of the Insignia TV(manufactured by LG) I'm convinced of it.

Just out of curiosity, are most 120Hz LG TVs having these A/V sync problems, or are these isolated incidents? I think I'm gonna make an attempt at contacting LG customer service and ask that question.

Travis, you might want to do some bypass tests first because in my case when plugging Audio from receiver to amplifier and from receiver to TV the audio synch problem is the same. So it is obvious that the TV is not the problem. But just for the fact that it seems that nobody except for the guys in the lab knows the service tech just send someone over. I contacted Bell and because they already replaced the receiver once they decided to send a tech. So this week I will have a tech from LG to change the processor and also a tech from Bell to do whatever.

BTW I found a way to bypass this problem. With a good Surround amplifier you are able to adjust the speakers based on distance. If you play around you will be able to fix the problem. Won't work however if problem is intermittent from one channel to the other.

Travis, you might want to do some bypass tests first

I did. I bypassed the audio into the TV by listening to the audio out jacks of the Blu-ray player, muted the TV, and there was no A/V sync problem.
I tried this with 4 different DVD players, with the same exact results each time.The audio problem is definitely with the TV. Now if you completely bypass the TV audio, by connecting the DVD audio out RCA jacks directly to a receiver, you'll be able to eliminate the problem during DVD playback.........
But how will you explain the problem to the next guy that you want to sell the TV to when it's time to upgrade?


Edit: Believe it or not, I have a 2 year degree in electronics (not in TV repair) and there is nothing you could say to me to convince me that these TV's don't have A/V sync problems. If yours is still within the store return period, I'd return it. (unless you don't mind always having to use an external audio system, bypassing the Tv's sound, and not having the option to use the TV's own sound)

The audio problem is definitely with the TV.


Not to say there aren't problems somewhere else within the system, in addition to the A/V sync problems caused by the TV.
e.g.
Poor video encoding from the source material.
An intermittent problem with the broadcast signal.
An improperly burned DVD.
Ect.. Ect... Ect......
(but then again, you're probably already aware of this)

Not to say there aren't problems somewhere else within the system, in addition to the A/V sync problems caused by the TV.
e.g.
Poor video encoding from the source material.
An intermittent problem with the broadcast signal.
An improperly burned DVD.
Ect.. Ect... Ect......
(but then again, you're probably already aware of this)

I think we have both different problems. I agree with you in your case it is definitely the TV. So far in my case it seems to be the satellite receiver. However, if it ends up being the TV I will definitely return it. I just think that most of the people get fed up and live with it because they just can't figure it out.

I think companies modo now is "Why make it simple when you can make it so ****in' complicated"

Well, tech from Bell came and was completely puzzled. Called another tech and his head office to finally change again for the 3rd time the satellite receiver. Huge improvement.

Still got the problem but barely noticeable. Just a few channels now.

Still waiting for LG tech to come and do upgrade or change processor.

Still got DVD out of synch now.

I returned my LG manufactured Insignia NS-L46X-10A to Best Buy.
I replaced it with a Samsung LN52B630, and although the A/V sync is not perfect, when people speak, it no longer looks like overdubbed martial arts movies from the 70's!! :D

Edit: Sorry for gloating, I wish everyone else the best of luck resolving their problems.

I had the same problem with a Samsung 50" plasma- the audio was just a fraction ahead of the video if I ran the video to the TV with HDMI cable, turned off the TV sound, and ran the audio to the surround sound system with optical or RCA, either way. Samsung support helped: The problem is with the Digital Rights Management (DRM), curse the beast! HDMI cabling means that the signal goes through software that checks for authenticity. The audio output did not have this because the receiver doesn't have the software or the HDMI input. The time it took the TV to process the DRM resulted in the very slight but very annoying delay. Solution was to use the audio out from the TV to the receiver, BUT that eliminates 5.1 processing / surround sound. This is usually no big deal with TV audio output, but more and more programs are coming out with 5.1.

Well, tech from Bell came and was completely puzzled. Called another tech and his head office to finally change again for the 3rd time the satellite receiver. Huge improvement.

Still got the problem but barely noticeable. Just a few channels now.

Still waiting for LG tech to come and do upgrade or change processor.

Still got DVD out of synch now.

I have the same problem with my 42lh30... Are you still waiting the LG tech guy ?

Mathieu

LG tech passed and changed the motherboard. This didn't improve. He said that they are waiting for the update to come out to correct the problem. I will retest the whole thing going thru the audio of amplifier instead of tv to see if it changed anything. I really doubt it. As for Bell we switched for a third time the receiver but I really think that the problem is a combination of both satellite and TV.

My 47" LG LCD TV had the same audio sync issues. I was able to plug an internet cable into the TV and it automatically found and installed firmware updates. It went from version 3.7 up to 6.something. I then had to also update my LG blueray player the same way. It works perfectly now! Woot woot!:) I hope this helps ya'll still living with this issue.

Clay, I know this must have been a simple task for you - but could you please describe how you connected to a computer so that the tv sought the firmware update? My LG47 Infinia has a "dongle" internet connection, but we're not spending $80 for the dongle until we make sure this SECOND LG Infinia works.

I have a laptop on my wireless network. Can I run a cable from it to the tv? Ethernet? HDMI? How did the tv "let you know" it was searching for and updating the firmware?

We had to return the first LG Infinia because the tv kept losing video signal. (Yes, we tired all different kinds of cables/connections, refresh from cable company, different DVD player, everything the techs told us to do....) The second LG Infinia doesn't have that problem but the audio sync is terrible - sometimes at least two more words are heard after the person's mouth closes. It's a terrible viewing experience! We're not real happy with LG products.

hi i have an lg 550t 47" and i had sound lag so i went in to the service menu and in the i think in system 1 there is a lipsync adjust i adjusted this to -5 and its spot on now i guess this will work on most lg tvs just thought i would let you know:)