I couldn't find anything on my problem, so a new thread!
I have an LG 37LF2510 for which I naively bought a Sony DAV-TZ230 Home cinema, thinking it would be plug and play!
My problem is that the only way to get the sound "out" of the television is through the phone jack (and no control over the quality of the sound!)! Into the the DAV-TZ230 through a synch RCA in adapter! Everything else has no output from the television, neither HDMI, synch nor RCA jacks!
There must be a way of doing this!