I cannot get 5.1 sound from a logitech Z-680 HTIB when connected to PS3 and my Samsung 650 52 inch TV (touch of red). Have tried PS3 to 680 with optical and tried HDTV to 680 with optical. Logitech told me I could only do it with the PS3 optical to the Z 680. When I do that (with the PS3 set to 5.1 sound via optical) I get muted sound from all front and rear four speakers and no sound from the center channel at all. In fact, I cannot get sound from the center channel no matter what I do! The center channel worked for a while, but stopped, and it is not the speaker itself, nor the speaker wire or optical cable or their connections. Finally the remote stopped working. I fear the cross-over board inside the subwoffer enclosure has gone bad?
Please help me if you have suggestions. I received the Logitech Z-680 as a gift from a friend and it is in new condition right out of the box. I have spend many hours trouble shooting and could use your help.