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Question about InFocus ScreenPlay 4805 Multimedia Projector

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Help..... Left half of screen dark.. Can still see image through darkness a little.. wont let me change most settings now. Lamp is under 300 hours. I do know how to change components and solder if its something on the board. took it apart and tried to test voltage levels on parts of the board and accidently blew a fuse but took care of that. Actually more than half the screen now. happened overnight, not a gradual problem.

Posted by Steve McDonnell on

  • 2 more comments 
  • Anonymous Jan 26, 2008

    Same problem, Bulb blew up after only 650 hrs ....INFOCUS SUCKS !!!!!!!!!!

  • ravinders Jan 27, 2008

        Hi Steveoh's, I am having the same problem, left half of the screen has gone black. I would be interested to know if you eventually resolved the similar problem you were having. Thanks.

  • theOctagon Feb 26, 2008

    Same problem here, and yes PLEASE inform as to where to purchase these parts.

  • bluemundo May 13, 2009

    shadow on right side of screen. still can see dim image there. everything else is ok.



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Hi there.

This is definetly the light tunnel issue. After searching and a million phonecalls, I tracked down a place that you can buy the light tunel for $41 on their own and simply put that in, making the projector good as new.
I Have the phone number of the place and also the link to the forum giving you fully pictured diagrams of how to change the light tunnel, and also I have a service manual if anyone would like it to be sent to them.


Posted on Feb 11, 2008

  • Anonymous Mar 28, 2012

    Hi Russ,
    I'm very much interested in finding a source for replacement light tunnels. Could you post the info on this? aTdHvAaNnKcSe - Ian - Ottawa Canada




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  • 167 Answers

Buy a new lamp immediately!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Posted on Jan 26, 2008



Light tunnel

Posted on Feb 02, 2008


Please read other posts concerning this problem. It's the light tunnel that's the problem and certainly not the lamp.

Posted on Feb 01, 2008

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I have a sony handycam ccd-trv108 ntsc and the image on the lcd screen and the viewfinder is completely dark you could see the menu and everthing just not the image maybe the lens please help!!!!!!

O heck my camera too went like this, it turned out to be the lamp in the camera that lights up both camera screens, everything looked really dark with out that like, and wow not cheap mend for me, as they charge a bit for the bulb about £4 in UK, but the man who does the job must be paid around £60 per hour, and that hurt, now do you need a box of hankies as I still got couple left.


Dim, dark, fuzzy

your light tunnel is out of adjustment or has collasped.

VERY Dim screen after a drop

Have you tested it with an external monitor?

I would say you either have a damaged inverter board or screen baclight lamp. Usually the inverter board fails in one of the following ways:

1. When you turn on the laptop, the screen lights up for a short period of time and then goes dark. You still can see an image but it is very dark, almost invisible and definitely not usable. When you restart the laptop, the screen lights up and then goes dark again. The laptop works fine with an external monitor.
2. Your laptop turns on but the screen remains dark all the time. You still can see a very dim image outline. The laptop works fine with an external monitor.
3. The laptop screen works fine for hours or even days, but sometimes it goes very dark as it mentioned above. When you restart the laptop, the screen works fine again.

Inverter failure symptoms are very similar to backlight lamp failure symptoms and in most cases you cannot tell which one is causing the problem until you replace either the inverter board or the backlight lamp. From my personal experience, inverter boards fail more often than backlight lamps. If you have to guess, replace the inverter first.

ThinkPad T21 dark monitor. What part to change?

seems like a bad inverter that needs changing

Screen is half dark and whistles when battery is unplugged

You could have a defective screen, either a faulty inverteror a CCFL lamp - follow this to determine the fault.

Defective CCFL backlight, it may have the following symptom:
  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display.
  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out for parts, repair service and DIY info.

Dark screen since new

Wow only 10 then major work, hum. First if pic is:Split screen picture with one half darker than the other half. "Deep Field Imager" is set to the demo mode, press the "video" button repeatedly to cycle through the video settings until Deep Field Imager is accessed and then change the setting from demo to "on" or "off" depending on preference. Also u can try:1. Dark blue raster with faint movement in the background, suspect the FMT PCB part # 934C153001 . Also1. May be intermittent. Remove and reseat the DVI cable between the Chassis and Optical engine 2. Removing and reseating the DVI cable does not resolve, replace the Optical Engine part # 938P015020 Hope this helps Tom!!
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