Most RCA connectors on TVs are inputs to the TV so check the manual to see if there is some other minijack or headphone output.
I recently purchased 47LM6200 LED TV however, I have a subwoofer with two satellites with RCA connector, I am not able to use it with this TV. There are RCA connectors behind the TV but that does not seem to work. There is also optical audio output. With this configuration do I have any chance of getting to work? Thanks!