I've tried configuring my LG LED TV to output audio via its scart connector and it looks like it will only work when running off the internal freeview tuner.
Either use the headphone socket or for better results get an optical to analogue converter (your TV should have an optical output on the back). Been meaning to buy one for mine but havent got round to it yet lol.
Must have missed your original post otherwise I would have replied to it.