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InFocus LP280, the light works but I can't get a picture, whats wrong?

I have an InFocus LP280, the light bulb comes on but their is no picture, what could cause this? Where do I get the part to fix it? I have the tools and electronic training in circuit card repair so I can do the repair, I just need to know were to start.
Henry Lopez, May 2005
Make sure you turn on the LP280 before you turn on the computer.

JMcMasters, February 2006