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Mitsubishi Diamond Plus 200 insufficient blue

Discussion in 'Electronic Repair' started by [email protected], Feb 3, 2011.

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  1. Guest

    I just got an old 22" Mitsubishi Diamond Plus 200 CRT monitor.
    The previous owner said that the picture was "greenish".
    He didn't say anything else about it.

    The problem is that the blue color is about one tenth as bright as it
    sould be, which means the colors look greenish-browning, unless I set
    the red and green gains down to where I can barely see the image in a
    normally lit room.

    Of course, I tried to set the blue gain to the max setting, but it is
    still one tenth as bright as it should be, by my estimation.

    I opened the unit up and looked inside. It is fairly free of dust.
    The parts of it that I could see without taking it completely apart
    didn't show any visible defects such as burned parts, loose connectors,
    broken wires, scorch marks, et cetera.

    Aside from the dim blues, the unit works just fine, and I would like to
    take a shot at fixing it.

    Does anyone have any suggestions for what I should check first, second,
    third, and so on?

    Thanks to all of you.

    Graviton.
     
  2. Sjouke Burry

    Sjouke Burry Guest

    One thing which sometimes helps, reflow all connections on the board
    plugged onto the tube.
     
  3. N_Cook

    N_Cook Guest


    Try swapping red and blue drive lines. Isolates to the final or earlier
    stages
     
  4. Guest

    I'm not a professional, just an experience amateur, so my tools and
    skills are limited. Could you provide more details on this procedure?

    Thnx.
     
  5. Guest

    Also, could someone point me in the direction of a pdf of the service
    manual that I could download? Preferably for free?

    Thnx.
     
  6. Guest

    Additional symptom: when it starts up, the blue comes on from the bottom
    of the screen up, but in less than a second.

    Thnx.
     
  7. Guest

    I don't see any hardware RGB adjusters. I've only used the software
    controls.
     
  8. It means that the software driver for the blue electron gun needs to be
    updated.
     
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