What to do:
If you have purchased a Wii U console, but your television does not support HDMI, you have alternative options to connect your Wii U console to your display:
A Wii AV cable
A Wii Component Video cable
If you currently use any of these cables to connect a Wii to your TV, simply switch the cable plugged into the AV Multi Out Connector on the back of the Wii console to the same connector on the back of the Wii U console.
If you do not have access to a Wii AV cable or a Wii Component Video cable, you will need to purchase one before you can connect your Wii U to your television.
For more information please contact Nintendo Consumer Support.