What is the model number of the TV. The Yellow/Red/White are commonly referred to as AV or Composite cables; yellow being for video and red and white for left and right audio.
This is pretty old tech and in some cases, it's been combined with the Component ports of your HDTV. The Red/White audio of the Composite ouput still connects to the Red/White audio input of the component connection, but the yellow, video ouput (typically) plugs into the Green port of the Component input *IF* your HDTV supports it.
Your TV's manual should tell you if this functionality is supported.
-Wolf sends
Note: COLGeek's advice is still recommended. If you have HDMI capability, use that.