We need more information to help you. Can you post a photo or two showing exactly how you have the RF cabling connected to your TV now? A picture is worth a thousand words.
I recently bought a new LCD TV and found it was very easy to get working with my 2600. I just connected the RF cable to the coaxial input of the TV with a little RCA-coaxial adapter ($5 at Radio Shack or here in the AA store), then told my TV to scan the antenna input for channels. My new TV immediately picked up the RF input and displays the 2600 signal with a very decent picture and sound.
Every TV is different, so it might be very helpful is you post a photo showing what inputs you have on the back. Also, what brand/model of TV is it?
Edited by ls650, Thu Nov 3, 2011 10:16 AM.