The audio signal "commes" tru the white andred plug.
The video signal you have 2 options,
yellow plug on the AV-cable, or high quality on the S-video connection
Audio: check with earphone to see if IPOD gives audio, if Y
check if you selected richt AV input on the TV. On a new TV there must be several and maybe have another name for the "tulip" connectors, like FRONT or SIDE(depending on brand TV)
To check the input (volume TV not to high) tap point of 3.5mm jack with finger, you should hear "buzzing/humming" noise on one channel.
Hopefully it helps, or if somone has better ideas to get you going