Instructions
Plug the component output end into the back of your Xbox 360.
Set the component cable's output to "HDTV." The switch is located near the base of the output plug-in.
Plug the five color-coded input connectors into their respective slots on your HDTV. Refer to your TV's manual if you do not know what your component input plug-in looks like.
Turn on the console and open the Xbox 360's "System Settings."
Go to "Console Settings."
Choose "Display."
Open "HDTV Settings."
Choose the highest possible resolution allowed by your HDTV. See your owner's manual if you do not know the highest resolution.