RCA RT2280 System "replace optical jack" Questions

plasma tv and blue ray player. The bose will not get sound from rear speakers. After much ado, Bose replaced the entire system with a new one... that didn't fix it.. So we just bought a new 00 Samsumg

...to it? I think something is wrong with the digital circuit board in mine, I would like to replace it and see. Reading your manual will help understand the 6 channel RCA and fiber optic ...

...do anything any different. i though the surround system was faulty so i took it back and got it replaced and ive got the same problem still. surely this has to be compatable as the dvd and tv are ...