I also have a samsung UE46B7070 and AFAIK there is no analog audio output from it. You need a reciever with S/PDIF input or get a separate D/A converter to make it work with you Linn Movie system.
I have the old Linn Movie system, that has no digital input for sound. For this reason i need to use the analog sound input, if i want to transfer sound from my Samsung LED to my Linn receiver.
But I think I have tried almost everything, without any luck.
I have 3 digital devices, all with HDMI (set-top box, Apple TV, PS3) in my TV. But the sound will only play using the internal speakers.
I have tried setting speakers to external, but nothing happens.