HOW DO I SYNCHRONISE THE SOUND WITH THE PICTURE?

That is called lag. it often happens on Bluetooth, satellite or Internet based television where the internet isn't fast enough for the quality of the broadcast. Often, you can fix this if you have a Pause feature. Pause for 5 minutes.

Lip-sync is a cumulative problem with potential errors entering at any stage in the broadcast chain where video is delayed and an equivalent audio delay is not added to counteract it. It can occur during post production, broadcast (at many stages), and even in disc mastering - and finally your TV may add more video processing delay (especially if HD or 4K TV) making it worse. The only way to correct it completely and have perfect lip-sync is to adjust (or shift) the audio relative to the video at the final output stage. That can fix lip-sync error no mater where it came from.

Since it has been documented that lip-sync error - even when not consciously noticed - causes viewers to perceive the characters and story as "less believable" , many cinema enthusiasts use external delay boxes made by companies like Alchemy2, Felston, Primare, etc.to intercept the audio and delay it to match the video perfectly via remote control.

I use a Felston DD740 and contrary to what the industry believes I can detect lip-sync errors down to the millisecond. I mean when I adjust the DD740 and achieve what looks perfect moving it a ms either direction looks "off". Most viewers will never see "perfect" lip-sync if they aren't performing such an adjustment while viewing.

Getting it "close" - perhaps within 30 or 40 ms - will allow most viewers to ignore it but the study done at Stanford showed the negative impact was still present.

The current theory to explain this is that our brains - even subconsciously - can't process the impossibility of sound before lip-movement and we look away from the lips to avoid the impossible and in doing this we form the same opinion of the characters as we have of people who don't make eye contact with us. Ironically "we" are the ones not making eye contact with the characters in order to avoid the impossibility of sound before lip-movement.

You can run your own test to prove this: Force yourself to focus intently on the lips and you will see lip-sync error you never noticed before. You were ignoring it because it was below your "threshold of recognition" and looking away could conceal it.

After the cable change and adjustment you didn't notice lip sync error because it was probably below that threshold but something ( a digital video effect in the broadcast possibly) boosted it above your threshold and you noticed it again. The only way to eliminate the negative impact is to look for the error and adjust it out.

Most AV receivers and some recent TV's offer a fixed audio delay to correct lip-sync error and that can usually get it close enough that most people won't consciously be bothered but masking the problem like that doesn't eliminate the negative impact on the characters and story.

There may be a audio offset setting on receiver, add or subtract a few milliseconds. Its not the cable

run the sound directly from the tv, sounds like you are running it from another source , which is way the sound lags behind the picture. From the little info you have given, thats what i would say is the problem

audio lag is normal for many TV's.

The pixel problem your having is signal strength related, the sound is always affected first. If your on cable, have them come out and check the signal strength first.

There should be a setting in the Home theater's menu (probably under Audio or Audio Setup) to increase or decrease the delay. Set this to the least possible delay, or if possible, no delay at all. This, from what I read is a very good unit so it should have this setting in the 'Menu', if you can't find it, the manufacturer should be able to help. Good Luck!

when the voices start lagging behind hit stop and then play and they will be fixed!

Turn the volume on the TV all the way down. Its becasuse you have the sound come from both sources. its kinda fun to play with.

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.