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Mitsubishi Diamond Plus 220 monitor - insufficient brightness

Discussion in 'Electronic Repair' started by Luke Siemaszko, Mar 16, 2006.

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  1. Supericially this montior works OK. But when doing colour critical work
    the colours are wrong, so I start to set it up from scratch

    Start with the brightness
    As far as I am concerned the Right Way to set brightness is to display a
    blank raster, turn up the brightness until the raster is just visible,
    then back it off a little.

    - but I can never get a visible raster.
    There are two possible causes
    Vg2 too low
    Wrong black level in video amplifiers

    But I can't set these withot a service manual 'cos I don't know what the
    Vg2 is supposed to be


    Does anyone have a service manual for this model?
    Spec for Vg2?
    Details of where the adjustments for Vg2 and video black level are?

    Thanks very much
     
  2. James Sweet

    James Sweet Guest


    Is there a sub brightness/screen control on or near the flyback? If so
    you could bump it up a bit. It's quite possible that the CRT is simply
    aging.
     
  3. I'm being a coward - I don't have the time to experiment, I am hoping to
    get the correct service information to make sure I get it right. I'm
    not keen to just turn something up, because the Vg2 *has* to be right
    according to the designer's calculations.
     
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