CRT image Tweeking? Viewsonic PS790.

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  • Ken256
    Member
    • Oct 2009
    • 25

    #1

    CRT image Tweeking? Viewsonic PS790.

    Hello. I have some nice CRT displays. Its been some time since I have used them. The Viewsonic is actually working very well. But, I noticed a minor issue with the image.

    Images with an overall, low brightness appear very blue. Instead of dark gray, it is dark blue. With a full black raster, the screen is a very dark blue.

    I also have a Sony CRT monitor which does the same thing, except dark imagery has a distinct red tint.

    For full-brightness imagery the screens appear to have excellent color balance.

    I was thinking this could be a gamma issue, but my video card/driver (AMD radeon) does not have the ability to change gamma on each color channel.

    Is this normal for CRT monitors? I have been using LCD for so long that I have forgotten if this is what CRTs were like back in the day. I don't remember them this way.

    I have the service manuals for both monitors. Could there be a mismatch in the 3 color channels that would cause this? What is the possibility of tweaking them so that the color is balanced for low-brightness imagery?
    Has anyone done this before?
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9514
    • Canada

    #2
    Re: CRT image Tweeking? Viewsonic PS790.

    The problem is likely the crt emission is getting low, I don't believe this monitor has any manual crt bias an drive adjustment controls, If I remember you need service software to access the adjustments
    Last edited by R_J; 06-11-2020, 09:57 AM.

    Comment

    • Ken256
      Member
      • Oct 2009
      • 25

      #3
      Re: CRT image Tweeking? Viewsonic PS790.

      Originally posted by R_J
      The problem is likely the crt emission is getting low, I don't believe this monitor has any manual crt bias an drive adjustment controls, If I remember you need service software to access the adjustments
      I thought an aged CRT would show a dim and blurry image. But this CRT is bright and sharp overall. It is just low-brightness images are blueish.

      I did look at the service manual and saw a data port. I imagine the adjustment software is long gone.

      Comment

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