Sounds like the output on the TV is a phono socket or a jack and the inputs on the sub woofer take banana plugs. You need (or should make up) a lead with a phono or jack plug one and and two banana plugs the other end. (phono plug/socket has two connections and banana plugs just one)
If you can provide the model numbers of the two bits of equipment I can check this for you.
Answers & Comments
Sounds like the output on the TV is a phono socket or a jack and the inputs on the sub woofer take banana plugs. You need (or should make up) a lead with a phono or jack plug one and and two banana plugs the other end. (phono plug/socket has two connections and banana plugs just one)
If you can provide the model numbers of the two bits of equipment I can check this for you.