You would be wrong. Lamps do not do that. They either work
or they don't, they do not cast shadows or give half an image.
What is going on is the light tunnel has failed. It is a small,
4-sided mirrored tunnel that focuses the light into the optical
chamber. It is directly behind the color wheel. I've seen
this probelm dozens of times.
I had the same problem and discovered it was the mirror tunnel. located after the colour wheel. one of the mirrors had come loose and eventually touched the other side. this was the problem on mine. it could be worth a check.
I had the same problem. I removed the lamp housing and cleaned all the vents and it improved. Now only about 3 inches on the right side of the screen appear to have a shadow cast on them. I've submitted a query to InFocus and hope to get a reply. I'm betting its a lamp problem.
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Fault with its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
If half screen is affected it will be either a board (LCD and Plasma have different names) but in those one board drives each side of the screen unit--worst case is the display panel itself which is fatal from a cost point of view.
LCD screens have a backlight. When the backlight starts to dim it will eventually completely fail, causing the image to be really dark, barely viewable. You will need to replace the LCD screen, or replace the entire unit.
Dark as in gone or dark as in the image is still viewable? How does the onscreen menu look when the image is dark/gone? If the onscreen menu looks right and the image is still dark, you might want to check the cables or another input. If another device using different cables and another input looks fine, you may only have a problem with the input/cable you are using to view the movie. If the onscreen menu is also dark, then I would think there is an internal problem that needs looking into.