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Sony KV-2790R-What Causes Green Color?

Discussion in 'Electronic Repair' started by [email protected], Dec 30, 2004.

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  1. Guest

    I have a Sony KV-2790R that the green color is dominating the picture.

    What causes this in a Sony?

    And can this be adjusted internally. (The adjustments on the front
    panel do not correct the problem)

    Thanks

    Marc
     
  2. Cubzilla

    Cubzilla Guest

    Not in any order
    a) The CRT is aging and the RED gun is failing

    b) Components aging out of tollerence, it can't be corrected without
    replacing the affected components.


    Regards
     
  3. Jerry G.

    Jerry G. Guest

    On your model of set, a failing CRT is the general cause of your
    observation. It is possible that some failed components on the CRT board, or
    the main board is the cause, but this is rare in the case that you are
    describing.

    The best approach for you is to take your set in for an estimate to find out
    if your set is feasible to service. Considering if the set is older than
    about 4 to 5 years, I would retire it, and get a new set.

    --

    Jerry G.
    =====

    I have a Sony KV-2790R that the green color is dominating the picture.

    What causes this in a Sony?

    And can this be adjusted internally. (The adjustments on the front
    panel do not correct the problem)

    Thanks

    Marc
     
  4. Guest

    You can temporarily compensate for weak red and blue crt emission by
    increasing the SCREEN voltage for the red and blue guns. The screen
    controls may be a back panel adjustment, or they may be inside the set.
    You need to adjust them with a black and white picture displayed to
    get the best white+gray balance. You may also have to increase the red
    and blue DRIVE controls. If you have enough brightness with the
    brightness control at maximum, you can also turn down the green screen
    control and the green drive control a little. But, once the CRT is
    going, adjusting the screen and/or the drive controls is a temporary
    fix and you should start saving pennies or larger coins to buy a new
    set.

    H. R.(Bob) Hofmann
     
  5. Charlie East

    Charlie East Guest

    Does anyone ever rejuvinate the picture tubes anymore? I have had pretty
    good success with some tubes, Get a little more life out of them.
    Charlie
     
  6. I haven't been in the business for a few years, but even with Sony
    CRT's, I squeezed months to years by blowing away G1 shorts, using the
    Sencore whatever's light cycle to dust the cathode a bit, and also
    rolling my own filament winding to a slightly higher voltage when
    necessary.

    When one colour dominates, I usually would adjust that colour down
    first, rather than the other two, if the contrast, brightness, etc.,
    could accomodate and still provide a good picture.

    Tom
     
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