Are you sure that the cables are good. I.e., they work when connected between two other devices.
Are you using any adapters:
Did you reconfigure the Smart TV to use Composite connectivity - should be a port selection via the TV's menus.
Depending on the available ports and viable TV menu configurations you may have some choices.
Here are two links that can provide some guidance provided you can match the ports on your devices:
http

/www.diyaudioandvideo.com/TV/WiringDiagram/
http

/www.ceaconnectionsguide.com/