Question about InFocus ScreenPlay 4805 Multimedia Projector

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Glass prism How do you get to the glass prism in the 4805.

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Re: glass prism


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.

Posted on Dec 28, 2007

Re: glass prism

Sorry to butt in but the Infocus 4805 has no glass prism, just a light path (tunnel made up of mirrors), color wheel, a mirror that reflects the light to the DLP and back through a single lens and then to the main lens. If you have a problem with a shadow on the left of the projected image (assuming that the projector is the right way up). The problem is a collapsed light tunnel which needs to be replaced although I have glued collapsed light tunnels back together using epoxy (NOT SUPERGLUE) and patience. This sits under the color wheel. Better leave it to an experienced technician.

Posted on Dec 30, 2007

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I have a yellow circle on the screen from the projector and need to purchase the prism assemble

it may not be the prism but rather a polarizer glass plate. take the cover off and inspect the optics parts to see which one may be heat affected and damaged.

Jun 06, 2011 | Sanyo PLV 70 Multimedia Projector

1 Answer

Hi my infocus projector 4805 glass filter has fallen out, how do i fix it pls (ps i am a technologically incompetent female so need non techy language pls :)

Its commonly refered to as a Light Tunnel Failure. Go to and search for "4805 Light Tunnel" and you will finds threads on how to fix the problem.
If you have never opened the PJ before, there are 1-2 threads about opening the cabinet.
I also posted a DIY replacement solution that may help:

Jan 06, 2011 | InFocus ScreenPlay 4805 Multimedia...

1 Answer

Just replaced burnt out bulb in Infocus 4805 projector. Great picture with new bulb but only black and white. Is this a bulb issue or something else in the projector?

This is most likely the color wheel. When the bulb blows, it can damage the color wheel. The color wheel is a wheel composed of thin layers of colored glass that spins in front of the projected image. It is possible to repair it with super glue, but the best way is to try to find a new one to buy.

Dec 29, 2010 | InFocus ScreenPlay 4805 Multimedia...

1 Answer

My Infocus 4805 is just showing the INFOCUS logo and not showing the picture from the TV. all connections are correct but no

Powering On
  • If your InFocus 4805 projector is having a hard time powering on or doesn't power on at all, it could be one of two things. Due to the extreme temperature of the lamp that causes the temperature of the projector to rise, every InFocus 4805 projector has a cooling system. Check your projector's cooling solution, as it may need to be replaced. Also check the projector's fan---if the fan doesn't spin, the unit will not turn on. If the problem is the fan, you'll have to get it replaced. You can do this at the same place you bought your projector.
  • The Lamp
  • If your InFocus 4805 Projector powers on but does not project any light, the lamp will need to be replaced. All projector lamps must be replaced at some point---how often usually depends on how much use the device gets. Simply order a replacement lamp, unscrew the old one and screw the new one in. The projector will then work like new.
  • Color Wheel
  • If your InFocus 4805 projector powers on and is displaying images but the colors on the images appear warped or are not in the proper places, your "color wheel" will need to be replaced. The color wheel is a small device that essentially acts like a prism. Light is projected through it and it displays the appropriate colors on screen the way they appear in the original video source. Order a replacement color wheel that fits your model and use your instruction manual as a guide as you swap the old one out and put the new one in.
  • Aug 08, 2010 | InFocus ScreenPlay 4805 Multimedia...

    1 Answer

    Screenplay 4805 not anything. I plugged it in, heard a pop, and then tried to turn it on, and nothing happened. No fan, no light. Could this be a fuse?

    Yes, it could be the glass fuse on the power supply/ballast. If you remove the top cover you should see it clearly if it has blown.

    Aug 06, 2010 | InFocus ScreenPlay 4805 Multimedia...

    1 Answer

    Was watching a movie, heard a loud pop & then the fan was very loud & noisy

    The lamp blew out and the broken glass is in one of the fans. You MUST get the glass out of the fans, intakes and bulb compartment before replacing the $275 - $500 bulb...

    Apr 16, 2010 | InFocus ScreenPlay 4805 Multimedia...

    1 Answer

    Infocus 4805

    You may have got finger prints inside the unit. Use alcohol and a paper towel or q tip/swab to clean all the glass surfaces including the bulb. You should never touch these bulbs because the oils from your hand will decrease the life of the bulb. Also make sure you put all the parts back and that they are tight. Last item is the lens may screw for focus.

    Aug 29, 2009 | InFocus ScreenPlay 4805 Multimedia...

    1 Answer

    I have two Sony PX11 projectors, one with a bad (discolored prism). How can I pull the prism out to replace it?

    it's not the prism. chancs are it's the light filter(s) on the lcd panels. the prism is just coated glass. the light filters determine the color. you need to take the top off, the main board off (unplugging the ribbon cables), and the lens off. the lcd panels anf the filters are attached to the prism. remove the filters, but do not remove the lcd panels!

    Aug 14, 2009 | Sony VPL PX11 Multimedia Projector

    1 Answer

    InFocus 4805 lost red

    Yes Geoff, What has happened is one of the two red glass filters on the color wheel has separated and flew off which was the snap you heard. So white light is in half of all parts of the spectrum that require any red.

    There should also be a vibration now that can be felt on the projector and possibly heard as well.
    I suggest not running it again until this is repaired as more damage could result. If you have the skills and the part that flew off isn't destroyed it can be carefully glued back in place and problem solved. I have seen quite a few of these glass filter segments survive this.

    Good Luck!


    Nov 16, 2008 | InFocus ScreenPlay 4805 Multimedia...

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