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LCD rear-projection TVs are lit with a bulb. Replacing this bulb is one of the few projection TV repair projects that a reasonably handy owner can undertake.
When the screen gets dim, it's time for a new bulb. Unfortunately, these cost between $150 and $200.
Your TV repair manuals should contain instructions on how to replace the bulb, but most manufacturers have made this process fairly easy -- just a matter of turning a screwdriver, taking out the old lamp and setting the new one in place. The hardest part may be getting to the back of the TV to do it!