hehe. First off, NEVER reach inside a TV unless you know what you're doing. Even when they're unplugged, the capacitors store a lot of energy and you CAN get injured or killed doing that.
As for the X-ray warning, X-rays are produced when the electrons from the cathode ray guns hit the phosphors. This is true on any CRT TV. Your rear-projection TV is most likely a transmittive CRT projector system, which means it uses a small (9 inch or so) very bright CRT (some designs use a separate CRT for each color) to emit the picture, which then passes through the lens and is magnified to fit on the large screen. That little CRT will be the source of the X-ray emissions.
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