I just got an LG LHB655 Home Theatre. I have an oldish LCD Sinotec TV and an Amazon Fire TV.
The problem I'm having is what ever I do on the Fire TV, the sound comes out of the surround sound first, and then the TV. And so we get this annoying echo. Since my TV is not that new, there is no settings to change the delay of the sound. The Home theatre has an option to delay it, but that makes it worse. The Fire TV does not have any options for that.