my tv is older and only has one set of input connections and a coaxial for the cable line. I want to hook it up to my sony str de875 receiver that my speakers work on. this surround system worked on my other tv, but is not working on my grandma's tv. My dvd player works fine and sound comes out the surround speakers but when i want to watch tv With the surround speakers there is no sound from them. Anyone know how to fix this prob or know where i can get help to fix this?