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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  • busta25 Dec 29, 2007

    yes I am . I don't want to pay to get it fixed. I will just replace it.

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Greetings,

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

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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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Posted on Jan 02, 2017

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Related Questions:

1 Answer

How do I get rid of the dark shadow across the top of the screen?


This is actually a fairly common issue with the NEC projectors, especially if they are mounted from the ceiling (upside down). The problem is the compartment immediately after the bulb. What happens is the 'paste' they use to adhere the glass prisms to it's plastic component wears off overtime due to the immense heat from the bulb being projected onto it. The glass prism piece ends up leaning against the bulb compartment creating the annoying 'shadow'.

Heads up; you will need to take apart almost the whole projector. You'll need to expose the mirror array to get to the compartment just after the bulb. Once you've dissassembled the projector down to the mirror array, take out the problem part. It's a small black plastic cube frame that's held in by a screw and has 3 glass/plastic prism pieces. Looking down at the disassembled projector, you may not be able to see the glass/plastic prism pieces but I can assure you that it is the small compartment immediately after the bulb compartment.

Once you've identified the component and taken it out, you'll see the prism piece(s). The problem prism is the one that sits closest to the bulb and it was either slightly loose or had fallen off completely. Please note that there is another one of these exact prisms on the other side of the assembly you pulled out just behind the plastic looking prism. This secondary one come loose very rarely but if it does, you'll need to fix that too.

The Fix: Since the component is going to be exposed to immense heat again, you'll need to buy an adhesive that can withstand that heat (think at least a few hundred degrees for safety sake). I bought the JB-Weld Steel Reinforced Epoxy since it can withstand heat up to 550F. Make sure you read the instructions before starting. An added suggestion is to scrape all the old residue from the old adhesive off the component and prism(s) first, then scratch some grooves into the connecting pieces and apply the epoxy/adhesive. Do not scratch up the actual prism itself; scratch the 'extra' glass on the prism piece where it will connect with the plastic component. The grooves help the epoxy bind to the pieces and I highly suggest this since I've had to re-do a few in under a year. Let the epoxy set for a good 24 hours before putting the projector back together.

Nov 03, 2014 | NEC NP400 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 www.avsforum.com 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:
http://www.avsforum.com/avs-vb/showthread.php?t=1304694

Jan 06, 2011 | 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 signal....help


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

    We had a fire and my binos got smoked inside. I took apart the front and cleaned the prisms in front and lenses. How do I access the back prisms? How do i get the cover off the prisms at back of binos.


    most prisms have coating on their air to glass surfaces. Chances are you have already degraded their original quality, even with the smoke gone. From past exp. you will be better of getting another bino...

    Feb 16, 2010 | Bushnell Legend 19-1050 (10x50) Binocular

    1 Answer

    My InFocus 4805 SP projector is showing just black and white


    If you have any video at all and it's only Black and white there is a 99.99% chance that your Color Wheel has lost all of it's glass color filters.
    You can confirm this by removing the lamp. then look straight into the projector where the lamp was and you should see the color wheel of colored glass segments (Red, Green and blue) I believe you won't see them because they came off of the wheel.
    Also if you lift up the projector and turn it around in various angles and you will hear the small pieces of broken glass from the color wheel.
    Unfortunately you will need to take it to an authorized service center for repair. Be prepared to spend upwards of $300 for the repair.

    Cheers

    Aug 23, 2009 | InFocus In Focus SP-LAMP-021 Replacement...

    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!

    SagerTronics

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

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