Question about InFocus LP70+ Multimedia Projector

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InFocus LP70 Won't display Top 3/4 of screen even with new bulb

I have a LP70 DLP projector:

And have recently found that the greater top 3/4 of the right hand side of my screen is not showing up. When connected to a computer only the start menu and a few icons on the far left of the screen show and fade out diagonally upwards to the right hand side.

(a good 60% of the screen isn't displaying, it fades diagonally with a curve)

I thought it was the bulb and replaced that but still have the same problems...


**I noticed a spinning lense at the entrance of the housing where the DLP
lenses are located and thought perhaps if that stopped spinning for
some reason if that would cause the distortion.

I also got a slight burning smell from the projector prior to changing the Bulb.

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  • Anonymous Sep 18, 2008

    My InFocus LP70 does not display all 4 sides of the screen, if it does they are not focused properly...any solution?

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If the colorwheel stopped spinning, the projector would shut off. take the lamp out and spin the colorwheel (with a pencil eraser) to the clear section and look at the square on the other side. if it's not a complete square or something is inside the square, your light tunnel is collapsing and needs replacement (also called an integrator rod).

Posted on May 28, 2009

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That is caused by a collapsing light pipe.
This is a mirrored glass square component that is located directly behind the color wheel. It is comprised of 4 mirrored section approximately 40mm x 8mm that are glued together with a hi-temp adhesive to form a square. The artifact you see is one of these mirrored glass section's has come unglued and has moved inwards blocking one edge of the image. The edge of this shadow is not sharp because this failure is not at a focal point.WHEW..all that being said it's possible to re-glue it if you are electro-mechanically savvy and have steady hands. You can also occasionally find a new OEM replacement light pipe (tunnel) on eBay. But if you need to take it to a service center they will most likely just just replace the complete DLP engine (the whole optic assembly) Hold on to your wallet!!


Cheers

Posted on Jan 16, 2010

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