LG/ComCast HD Audio Sync Problem?

Question

I just purchased an LG Plasma TV and upgraded my Comcast Service to receive HD signals. The HD picture looks great, however, I've noticed about a half second delay between video and audio. In some ways it's kinda like the old Kung Fu movies where the voices are out of sync...

I have my TV outputs going into my receiver (std L&R audio - red and white connectors). When I called LG, they told me to purchase the optical cables and that should resolve my problem. I plan on getting the cables today, but I'm not certain that will fix the problem.
I just purchased a new receiver and the problem happens with both the old one and the new one, so I know my receiver isn't the problem... I'm really not sure if it's the TV or the service...

Do any of you experts have some suggestions for me?

Answer 1

It os rather strange - usually the delay is in the VIDEO - not AUDIO - because it takes longer to process video signal than audio signal.
LG is probably right - the DIGITAL connection should speed up the audio. The way you have it connected you process the sound twice - first in the TV and then in the RECIEVER.
You did not mention a CABLE BOX. In case you use CABLE BOX, you should connect it directly to the receiver - not to the TV and then RECEIVER

Answer 2

So you are currently hooked up like this:

CATV -> TV -> Receiver

And you are using L/R analog cables? You wont get DD5.1 sound that way.

LG Tech support is correct. You should run:

- Sound from CATV to receiver
- Video from CATV to TV

(See how this feeds the receiver directly without passing through the TV?)

To test this- remove the L/R cables from the TV and hook the L/R outputs from the cable box straight to the receiver. While this will solve the problem, L/R cables cannot carry DD5.1 sound. So you do want to use toslink/optical.

If you dont mind waiting a few days, Monoprice has some good optical cables for budget prices. Otherwise, get an ARPro optical cable from BestBuy or a Radio Shack one.