Came across an interesting issue on my set that others may be interested to know. I like to use headphones as my hearing is poor and it would otherwise be too loud for others/ neighbours. I output the sound to my wire free headphone system through a small amp from maplins, connected to the audio out of the tv. This also means I can turn the sound down on the set and not display the sound muted icon and get sound out. Only other way is via the front socket but I dont like the trailing wires and open flap. However when inputing a digital sound in 5.1 from my dvd which is connected with an optical cable and component cables there is no sound output from the tv audio out! This seems a poor design to me as it works on all other sound modes outputing normal stereo for 2 speakers. It would be very awkward to reconfigure the sound out of the dvd to old style stereo each time headphones are desired so this is a pain.