Question about InFocus LP70+ Multimedia Projector

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Infocus LP70+ has a small shadow in the right lower corner of the display. Could this be a bulb or lens problem or ??? Thanks for any help suggestions.

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  • vfrdave Oct 29, 2007

    Where is the mirror? Is that the thing at the bulb which rotates?
     I took it to a guy who works on projectors who thinks it is the DLP chip or somewhere on the board, as pushing on it changes it and also starts and stops a flicker? Estimate to repair at a service center is $750, which is more than a refurbished unit cost. So I am still interested in fixing it, just don't want to kill it by poking about with it on. Thanks 



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The light tunnel is collapsing. it's used to hep evenly distribute the light and make the edges crisp. infocus now calls it an integrator rod (315-0055-xx).

to replace the tunnel (rod):
take the top off, take the screws out of the top and the wires out of the circuit board, take the fans out, take off the colorwheel shield, remove the lens assembly (optical engine), remove the colorwheel, take out the 3 set screws, and slide out the tunnel assembly. then remove the foil around the opening and the screw out of the top, and slide the rod carrier out. now remove the metal clip and the pieces of mirror. replace the tunnel (rod), put the clip back on, and reverse the procedure. now, the 2 set screws on the side are to adjust the image, so do not put them in too tightly, and they must be adjusted while the projector is on and the cover is off.

or give it to someone else to do.

Posted on May 14, 2009

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I had the exact problem and of course , I have no manual or instructions for my InFocus LP70+ Projector. I fixed the problem by accident! THIS WILL WORK!! Using the control buttons on top of the projector, Go to the menu on the screen, Go down to setup and press source select, then to Picture and press source select, Go down to position and press source select, you will see H___V___ , select the H (for horizontal) and adjust up or down until the shadow goes away! This cured my shadow on the right side and in the lower area.

Posted on Mar 17, 2008

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I was just given 3 of these projectors to take a look at to see if I could fix. The problem is definitely related the mirrors as previously stated. I have actually removed the mirrors and got all three working again. There seems to be a slight affect in brightness but other than that all seems well.

Hope this helps someone...



Posted on Jan 08, 2009

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I tried to pry it up and it's right in front me now dissasembled. There is this box-type light tunnel set of mirrors and the glue wasn't able to hold it now. no wonder, jarring it sometimes helped.
so it's the adhesive of the mirrors that did not withstand the heat. maybe infocus should order glue from selley's or the like.
I hope i can assemble the mirrors perfectly at right angles. These are about 1-inch i length by 3/16-inch for the two sides and 5/16-inch for the wider sides.
well, this would be the last time i will buy an infocus...let's see if they can have a better glue in ten years! so there you are...

Posted on Jul 18, 2008

  • jhun T
    jhun T Sep 25, 2008

    sorry for the delay...

    the mirrors I mentioned is located inside the metal tunnel fronting the round rotating cover (might be a glass). You have to loosen the hex-headed screws to remove the mirror holder. I tried to glue it back myself using an instant glue/cement. I haven't heard back from the user might have worked.



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I had this problem with the frist unit, then we sent it back to them. Now after using the new one for a few month its doing the same thing in the right corner.

Posted on Feb 05, 2008

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I too have this problem, and it has slowly grown to extend almost all of the way up the right side of the screen. I have reseated the bulb assembly, and checked for dirt on the lens - but no change.

Posted on Oct 12, 2007

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Posted on Jan 02, 2017

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