How to Hook an iPhone Up to a TV Using Audio Composite Cables
To watch your iPhone's media on your TV, you can connect your devices using either a composite or a component cable. If you look on the back of your TV, you will see either a yellow video input port or blue, green and red video ports. Use a composite cable if you have yellow; otherwise, you should use a component cable. Use a composite or component cables that feature the Apple dock connector, as standard AV cables cannot be connected to the iPhone.
Insert the yellow plug of the composite AV cable into the yellow video input port on the back of your TV.
Insert the red and white plugs into the red and white audio ports on the back of your TV.
Insert the USB plug into either a USB wall charger or to your computer to keep your iPhone charged while you watch.
Insert the dock connector plug into the bottom of your iPhone.
Set your TV to the correct input for composite AV; this is usually done with buttons on the side or bottom of the TV. Turn on your iPhone and use it as normal to play your media on the TV.