The red/white RCA ports on the back of the TV are input. The only output is the optical, at least according to the pictures I can find.
wow and this is the cheapest route? Will the sound quality still be good?
I don't know if it is the cheapest, it is an example of what you need. It has a decoder because unless you can restrict your TV to two channel output on the optical port, a the digital signal output won't be processed correctly.