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Purple Spot Problem - Further Details

Discussion in 'Projectors, Screens & Video Processors' started by Nexus6, Mar 14, 2002.

  1. Nexus6

    Nexus6
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    After very good advice from the forums to an earlier post which highlighted the problem of a small purple spot on the very bottom of my projected image and what the causes maybe I have now taken digital images of the problem:

    Of note are;

    Spots is only really apparent when showing Black or Dark Blue images or colours. Image attached as file 32, focused and showing spread spot.

    When i put the Projector out of focus the spots became very clear and looked like either dust particals or fingerprints on one of the LCD panels, although this would seem unlikely as the unit has never been opened since purchase.

    Kit:

    Panasonic PTL 701e LCD Projector
    Connection via a Prowire S-Video connector
    Samsung DVD 709
    Sound connected via a coaxial Quinex connector.
    Denon AVR 2801
    Yamaha NXP 220 Surround Package including Sub-Woofer.
    Yamaha centre replaced by a M&K K7 Centre.
    Screen, Blackout Blind (White) B&Q own.
     

    Attached Files:

  2. Nexus6

    Nexus6
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    Forgot second attachement. Here it is as file 33.

    Thanks
     

    Attached Files:

  3. Mark Grant

    Mark Grant
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    Looks like a bit of dust or fluff to me.

    Mark.
     
  4. Comer

    Comer
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    Yep, sure looks like dust spots. You will have to open the pj and blow around the lcd panels with a can of compressed air. I had a similar spot on my MT3, cleaned with can of air...no more spot, until the next one of course.

    Try posting for some one who has cleaned a pj similar to yours, they may talk you through the process.

    Conor
     
  5. jrwood

    jrwood
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    Yeah looks like dust, if you had submitted this to some other internet sites they may of thought it was a UFO :D . There's three options

    1) Get a duster buster / compressed air can and spray it in the room at different angles to see which angle is the best, you dont really want the compressed air liquid to fly all over your projector. I think most compressed air cans prefer being sprayed at a horizontal axis. You may need to open the projector to spray the compressed air closest to the LCD panels but be very careful.

    2) Get a vaccum cleaner and literally suck the air out of the projector, there is no harm doing this unless your projector has some flakey wire hanging inside the projector :confused:

    3) Take it into a specialised repair shop which may be able to help


    I presume you keep the projector in its case?, as Im surprised you did'nt notice a bit of dust appearing when watching a film. I've always wondered about fixed projectors on the ceiling whether they attract spiders/fly's..just imagine turning on your projector and watching a scary film only to have a 8 foot shadow image of a spider crawling accross your panel :eek:

    James
     
  6. Mark Grant

    Mark Grant
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    If you are going to spray a compressed air can onto the panels, be careful to use a can that does not release liquid propellant when tipped at an angle.

    If you get the liquid on the panels, you will have a hard time trying to get the panel clean again, if you ever can.

    If in doubt, find someone that has done it before to help.

    By displaying solid Red then Green then Blue pictures, you will find which panel has the dust on.

    Using a PC and windows desktop colours is easiest.

    Good Luck,

    Mark.
     
  7. Nexus6

    Nexus6
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    Will try a keyboard hoover tonight as a first option, I may well post a seperate note asking if anyone has cleaned the lcd panels in the Panasonic PTL 701e before, and are they located under the bulb housing.

    A friend of mine is bringing a can of air around and I know too hold the projector above the can so the air is travelling up, hopefully not releasing any liquid.

    Thanks again all for the advice.

    I keep the projector in the bag provided so can't see how dust got in in the first place.

    Nick
     
  8. jrwood

    jrwood
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