HDMI problem

Yo,

I just bought a LG 20-inch HDTV, nothing special but I use it in my bedroom and I'll probably spend the forseeable future in studio apartments and shared houses, so I don't need anything huge.

Problem is, when I attach a component to the TV with the HDMI cable (either the XBox 360 or the cable box), I get a delay between the video and the audio of as much as a second. It's not always that long, and sometimes if I switch channels and go back, it syncs up again.

What do I dooooooooo?

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