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lip sync is the combination of the two signal carrier frequencies being out of sync
one signal carries sound and the other the picture and they normally come together correctly but that can be upset by a blip in the power supply, problems in the signal from the station or atmospheric disturbance
try changing channels a few times , try shutting the set down and then restarting it
read the operators manual for any clues in the trouble shooting section
Lastly talk with a repair shop for any advice on how to fix
Try putting in a DVD or VCR tape..if they don't make any sound either...than you have probably blown an audio board fuse... But I bet that they will have sound which in that case the problem is more than likely the cable ITSELF not the box... the cable that carries the signal your tv has video on one wire and audio on another.. then sheilding etc.. it's probably got a short in audio ( I have seen brand new cables to do this so even if it looks ok try different one.) if that don't work... hook a different tv up at that location and see what happens... and then it's to call cable company to come fix the box which probably blew up scrambler... which would show that the output is working fine but unfortunately your tv is not able to dis cipher the audio because it's a tv not a cable decoding device...I hope that helps you.
You can probably patch the audio into the audio input jacks of the TV, however without a video signal there would be no picture on the TV, only audio... It is also possible that without a video signal, the TV may mute the audio inputs...
You need to see if the TV's sound, not the receiver is out of sync also. Turn up the sound on the tv and turn down on receiver. If it syncs correctly, your receiver isn't fast enough to process both correctly. You will have to upgrade your receiver to one that supports HDMI 1.4. Samsung sells one that works great, model # <span class="Apple-style-span" style="font-family: 'Lucida Grande'; font-size: 12px; ">HW-C500. </span>
When viewing on Digital TV:- Sometimes Audio and Video signal can not be transmitted simultaneously due to additional process time for the video signal compared to that of the audio signal. Often video signal takes more time than the audio signal to convert from analogue signal to digital signal in the Digital TV. It may result in mismatch of the picture and sound. In the TH-G30/40's HD AV Sync menu, you can adjust the audio signal delay for simultaneous AV signal transmission
1. Delay time can be varied in 10msec steps.(0 to 300ms) 2. Delay time is different between TV Brands.
So you need to adjust the delay time for correct lip-sync. The adjustment is listed in the instruction book page12
Lip-sync error is a widespread problem caused when video is delayed and audio arrives too soon. Widespread enough that three different manufacturers make dedicated products to address it, in fact (see review link below for those three).
It is present to some extent in essentially all broadcasts and DVD?s. If you have a recently acquired DLP, LCD or plasma display it may have added enough additional video delay to make it noticeable but lip-sync error comes from MANY sources starting at image capture and continuing through post production and broadcast or DVD encoding and it is cumulative. There is usually enough lip-sync error in broadcasts and DVD's to cause a negative impact on viewer perception (Research done at Stanford showed this.)
Many people don't consciously notice it until it gets very large because it's such an unnatural phenomenon ( audio can't come before the action causing the sound in the real world) we apparently subconsciously avoid looking at the faces and seeing the lips move "after" the sound from them is heard. A study at Stanford proved this causes negative viewer perception even for those who don't notice it so this is something we all need to notice as you already have.
For those reading this who haven't noticed it, take a close look at the LIPS - force yourself to overcome your natural avoidance mechanism that keeps you from looking at the lips - and you will see lip-sync error you never noticed before. I think you will be amazed that you could possibly not have noticed it before. You will be seeing what JC is seeing. I even see it now on CRT TV's
and am amazed I never noticed it so it's very obvious some avoidance mechanism is at work.
And back to JC?s solution: I'd recommend one of these digital audio delay units. That way you can correct for ALL cumulative lip-sync error no matter what its source might be. Any one of these units reviewed will correct it ALL.
With any one of these units you can adjust for perfect lip-sync at the start of each DVD or broadcast and not disturb the image you are watching during that fine adjustment. I have had a Felston DD340 since 2004 (three generations earlier than the DD740 covered in the review) but it still has the most important feature of all these units from these three different manufacturers which is their "plus and minus" buttons on their remotes that allow you to tweak the delay while watching your material without upsetting the video your are watching.
My av receiver has a built in delay of 80 ms which isn't even enough audio delay to offset the video delay my plasma display adds but even if it were it isn't practical to adjust it for the changes in lip-sync error from program to program and DVD to DVD since it overlays the screen with menus when making the delay adjustment. With my DD340 (and any of the units reviewed) all you have to do is press the plus or minus button until you get perfect sync.
Here is the review I mentioned:
if you are saying that your tv has no sound to match the lips movements then you will have to get a tech to repair your tv the problem is in the audio circuit could be a cap or the audio output ic.if you are saying that the tv has sound but it is not syncronizing with the lip movements have your tech check the sync circuit it is possible that the operating voltage is too small to allow the sync circuit to operate.good luck my friend.