Question about InFocus ScreenPlay 4805 Multimedia Projector

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Light tunnel where is the light tunnel

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Re: light tunnel

Anyone can tell me how to reset lamp to 0 hr. screenplay 4800 projector ?
I tried already but still reset factory default.

Posted on Jun 21, 2008

Re: light tunnel

OK, this is the easiest way leaving all the cables plugged in otherwise you would have to remove the power supply and lamp/fan housings. Here goes and good luck. Keep every set of screws labeled so you won't mix them up. You may find the job easier if you remove the lamp and aluminium plate between the lamp housing and color wheel. The lamp has to be removed first!

1. Remove the aluminium cover behind the lens(3 screws).

2. Remove the small board on the color wheel (1 small screw).

3. Unscrew the screws(2) that secure the color wheel. Carefully lift the color wheel by its bracket. Notice that this would be still be attached by it's ribbon cable. Pass a piece of thin wire through one of the screw holes on the color wheel and tie it out of the way. I usually tie the other end of the wire with the DMD heat sink.

4.Looking under where the color wheel was you would see a metal clip (2 screws) holding the light tunnel. The most delicate part is the color wheel so be very careful as this easily breaks.

Posted on Jan 05, 2008

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Re: light tunnel

How do you get to the light tunnel. I have opened the unit and I see the color wheel.
I do I get to it from there.

Posted on Jan 02, 2008

Re: light tunnel

Hi Busta25 I have answered your original question. If you intend to go ahead, I will guide you step by step.

Posted on Dec 30, 2007

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Re: light tunnel


Thank you for your email inquiry. It appears you are looking for the light tunnel for a projector? My intial question to you is why are you seeking the light tunnel to your projector? also, which model is it?


Posted on Dec 28, 2007

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Dark haze left side of screen about 4 to 6 inches wide only in the wider screens not in the native

Its a Light Tunnel failure. Go to and search for 4805 Light Tunnel. There are instructions to open the PJ and repair the Tunnel. Also, I posted a DIY replacement option in lieu of fixing the very fragile tunnel.

Jan 02, 2011 | InFocus ScreenPlay 4805 Multimedia...


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

2 Answers

We have a screenplay 4805 by infocus. the right third has a dark shadow over the picture? the picture is lightly visible thru the shadow.

the light tunnel under the colorwheel has collasped or the projector has been jarred, knocking the mirror inside of the lens assy. out of alignment. Either way, it will have to be repaired by a technician.

Oct 03, 2010 | InFocus ScreenPlay 4805 Multimedia...

1 Answer

New Problem after fixing Light Tunnel on a SP 4805

It sounds like you have mounted the replacement light tunnel incorrectly. It is a common error. What has happened is you have the light tunnel sitting on yop of the positioning stop which is opposite from the color wheel side. If you take it back apart you will see that it's not laying parallel to the casting. if you reposition it so it is just touching where the opening is in the clamp on the color wheel side you will feel it fall into place.

Jan 22, 2009 | InFocus ScreenPlay 4805 Multimedia...

1 Answer

Lp70+ display shows a solid black vertical line

the light tunnel is either collapsing and blocking the light going through it (and needs replacement) or the vertical/hoizontal adjustment of the tunnel. if you take the lamp out and move the colorwheel (with a pencil eraser) to the clear section, you should be able to see a square through it. if part of the square is blocking the middle, the tunnel needs replacing.

by the way, on some projectors the light tunnel is called an integrator rod.

Jun 17, 2008 | InFocus LP70+ Multimedia Projector

2 Answers

Fixing an Infocus X2 Light Tunnel Problem...

Hi JF1226

This quite a tricky job , but not impossible.

You will see once you've taken out the light tunnel ( also known as the packlight pipe module ) that there is one or two of the small mirrors that has come loose as a result of the lamp's heat.

Glue them back with Super Glue that dries very fast.
Do them one by one , always try to build them back in from edge to edge i.e. - If the top one and left side one is loose , do the side one first and then the top one - just makes it easier.

Remember you only have one shot at this , so do it carefully.

Good luck and thanks for using Fixya.

Apr 23, 2008 | InFocus ScreenPlay 4805 Multimedia...

4 Answers

Infocus sp4805

Hi Gerry

You will have to be more specific

Apr 01, 2008 | InFocus ScreenPlay 4805 Multimedia...

3 Answers

How much does a light tunnel repair cost?

Hi there

The light tunnel is not a expensive part to have replaced and it is better to do it than to keep on buying new lamps.

You can easily find your nearest Authorised Service Dept online.

Tip : Don't let just any monkey do this type of work on your unit , rather pay a bit more with the authorised agents.

Mar 25, 2008 | InFocus ScreenPlay 4805 Multimedia...

1 Answer

Infocus X3 light tunnel

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).

Feb 07, 2008 | InFocus X1 Multimedia Projector

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