Question about InFocus ScreenPlay 4805 Multimedia Projector

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How difficult is it to fix a collapsing light tunnel?

Can it be taken out and re-glued? Or does it have to be peplaced? What would be the cost?

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The replacement bulb is over $200 (maybe even more than $300).
It is a "halide" bulb that gets very hot.
Do not glue it; the glue (even when dry) will catch on fire.

Better to deal with it or consider replacing mmedia projector ($600)

Hope this helps!

Posted on Sep 04, 2009


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Mirror or light tunnel collapsing

A weakness that you might experience with your projector is the collapsing of the light or mirror tunnel. Not sure if this is common to DLP projectors only. The symptom is that you see grey bands or shadows on the edge of the TV image - this is caused by a mirror getting in the way of the bulb light. The glue holding the mirrors together seems to weaken over time (3000 lamp hours in my case) and causes one or more of the mirrors to loose its position. For solution, search for "mirror tunnel" or "light tunnel" under all projectors. The problem seems to be quite widespread. I managed to fix my LG's.

I wonder why the manufacturers don't use a rectangular glass tube that is mirror plated on the long sides ?!?! Suppose they want to sell new projectors after lamp or mirror tunnel expiry!

on Sep 15, 2008 | LG RD-JT91 Multimedia Projector

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Reddish line to the right of the screen. replaced bulb yesterday.

the light tunnel is collapsing. you can get the part from an infocus service center and do it yourself or send it to one for repair. either way, try av solutions in ny. they're really good.

Jan 17, 2010 | InFocus ScreenPlay 4800 Multimedia...

1 Answer

Part of the picture seems to be blocked by something in fron of the light source

That's exactly what is happening.
There is a "light pipe/tunnel" that is a is basically a mirrored glass conduit between the color wheel and the first lens. It is assembled with a high temp adhesive that holds the four glass sides together.
The adhesive has failed and part of the light tunnel is collapsing blocking a portion of the light energy.
This usually presents as a dark or shaded area along the top, bottom or one or both sides.
solution: the light pipe/tunnel needs to be replaced.
if you take it in for service they will probably replace the entire "DLP engine" (very expensive) If you're not electro mechanically challenged you could do some research and find the part and replace it yourself.
Another possibility is you could re-glue the bad one but this can be rather difficult to do.

Dec 27, 2009 | Mitsubishi WD-73827 73" HDTV DLP TV

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Tranlucent dark spot on Optoma image. Looks like something is on the lens.Off center--top to bottom. Cleaned lens, blew out case, changed bulb, still with dark spot.

is it an optoma or an infocus? if it is the infocus, it needs to be replaced. however, to replace it, you need to remove the entire optical engine. now off of that, remove the clorwheel and clip, the main board, and the tunnel (on this model it is called an integrator rod) assembly. to get that out, remove the 3 tap screws and the large screw. once you can slide it out, remove the foil from the front, slide out the inside tunnel assembly, remove the clip, then the tunnel. because the clip is an exact fit, you cannot have anything on the tunnel that increases the size. reverse the instructions to reassemble (but you will need to replace the foil with a new one). warning: you now need to realign the tunnel using 2 of the tap screws. if you have not done this before, it is very difficult and dangerous, as you need to have the projector powered on and the screws are way inside next to the power supply. there is a risk of electrocution and damage to the projector. best bet- send it in to an authorized infocus service center for repair. try av solutions in ny. they're really good.

Nov 15, 2009 | InFocus LP70+ Multimedia Projector

1 Answer

I have a InFocus 4805. Half the picture is darker

Your light tunnel may have collapsed. This is made up of 4 tiny rectangular mirrors glued together to make a tunnel.

Sep 26, 2009 | InFocus ScreenPlay 4805 Multimedia...

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You are describing a light tunnel failure. Unfortunately, Infocus has decided to discontinue any parts for the X series. Your only recourse is to repair the tunnel with superglue. Or buy a new projector. If you do attempt repair, note that the corners do not line up, rather the sides are offset slightly.

Apr 15, 2008 | InFocus ScreenPlay 4805 Multimedia...

1 Answer

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Are you speaking of the small prism shaped tunnel or the lamp itself? The prism or light tunnel may be accessed underneath the metal bracket that holds the color wheel in place. Be extremely careful as even breathing on this may cause it to collapse (ok, I exaggerate).

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Thanks for contacting us regarding your product questions or concerns. It appears you are wanting to know how to reach the glass prism from your 4805?

My initial question would be, why are you looking to access the glass prism in your 4805? This is a very dilicate process internally of your projector which helps it opperate. Are you trying to self-repair your projector?

Let me know. I'll be waiting for your reply.

Dec 28, 2007 | InFocus ScreenPlay 4805 Multimedia...

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There could be several reasons for this problem.
1. New lamp needed.
2. New lamp did not fix? Could be mirror tunnel behind the color wheel than can collapse causing "dim" light source or dark lines.
3. All items "greyed" out caused when the unit does not sense a source input, ie computer or tv tuner. After connecting to a source, you should be able to go and adjust contrast and/or brightness settings

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