Since I have 2 remotes, (one for the TV & one for the surround sound system), I keep my TV volume at zero and only use my surround sound system volume. This keeps me from getting the echo effect. Hope this helps you.
We had just bought an LED screen with a Home Theater System (both LG products). I was wondering how to make the Home Theater System the primary audio output of the LED screen TV... Any ideas would be very welcome. Thanks!