Help with Boxlight 20HD and poor image

Discussion in 'Archived Threads 2001-2004' started by Hetal_Patel, Jan 2, 2003.

  1. Hetal_Patel

    Hetal_Patel Auditioning

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    I bought the 20HD from Boxlight about 2 months ago and am using the plastex for my screen.
    I get an oval yellow discoloration on the images that are there about 85-90% of the time. I have sent the projector back to Boxlight and they said they could not find anything wrong.
    I have pictures at http://photos.yahoo.com/patelhe under the projector folder.
    Any help to correct this would be appreciated.
    Hetal
     
  2. Neil Joseph

    Neil Joseph Lead Actor

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    Welcome to the forum Hetal.

    Hmmm, this looks kind of like a hot spot. What is the gain of the screen you are using. The 20HD is already a very bright projector so if your screen has a very high gain then this could be the problem.
     
  3. Hetal_Patel

    Hetal_Patel Auditioning

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    I do not know the gain of the screen as I am using the DIY plastex product that has been widely described. If it is a hot spot do I need to just change the screen. Have you seen the images on the web, already.....

    Thanks for the help.

    Hetal
     
  4. Neil Joseph

    Neil Joseph Lead Actor

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    If you could temporarily place something in the middle of the screen with a lower gain, this would prove my point although at this point it sure does look like this is the problem. If so, you will have to use a lower gain material for your screen.
     
  5. Gabriel_Lam

    Gabriel_Lam Screenwriter

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    From the looks of the pictures, I'd have agree with Neil (sheesh, again).

    That Plastex product. It's the Parkland Plas-Tex panel, right? Are you using the right side of it (the bumpy side I think)?

    One thing you can try, relatively cheaply, is get this from home depot:

    Get a small can (31 fl. oz.) of their Behr Premium Plus No. 1500 Pastel Base (Pintura Interior.Mate).

    Have them mix this colormatch in:

    Colorant:________ OZ ___ 48 ___96
    B Lamp Black ___ 0 _____ 14 __ 0
    C Yellow Oxid ___ 0 _____ 4 ___ 0
    V Magenta ______ 0 _____ 2 ___ 0

    That's a colormatch of Dalite's High Contrast DaMat (0.8 gain). It's a pretty ideal gain for your high powered projector.

    BTW, what size screen are you using?
     
  6. Hetal_Patel

    Hetal_Patel Auditioning

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    I will have to try that once I get my projector back from Studio Experience.....Hopefully they will ship it back to me this week. They could not reproduce the problem, probably because it is related to a hot spot on the screen.
    They said maybe the blue LCD was overheating and they were going to increase the fan speed.

    I am using a 96-105 inch screen. Ohh forgot to mention that I had painted the screen with one quart white paint with lamp black additive of 5/48 oz. Don't know if that would make a difference for the plastex and or hot spot. I did use the bumpy side, I think, but I will check that again.

    Will let you know if that works......

    Thank you very much for your assistance,
    Hetal
     

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