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ViewSonic G220fb monitor ghosting

Discussion in 'Electronic Repair' started by Wayne Tiffany, Apr 26, 2007.

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  1. We have several of these monitors, and they are all performing very well
    except one. It has started showing ghosting lines that go out to the right
    of an object. The object can be letters, a dialog box, etc, but the lines
    all appear to the right only. None of the standard controls seem to affect
    the lines.

    I haven't opened it yet for lack of time, but just looking for ideas.
    Thanks.

    WT
     
  2. If you aren't going to open it up because of lack of time, how are you
    going to take the time to diagnose and fix it, you punk motherfucker.
     
  3. Yukio YANO

    Yukio YANO Guest

    Classic case of Ringing caused by an unterminated line !!
    I don't know why your Video line is ringing but the first test would be
    to plug in a signal using a working signal source, and cable from a
    working monitor. I had this problem on a SUN monitor and cured it by
    switching the Video Signals onto the Terminated Connections. Just
    imagine a Square Wave being fed into an unterminated line and seeing the
    signal being reflected from the unterminated connector ie a series of
    ripples (ghosts} !

    Yukio YANO
     
  4. Thanks for the reply. I do have it hooked to a known good source in that
    the computer that is currently driving it was just fine on the previous
    monitor. We swapped the monitor with another computer because the good one
    wasn't being used as often as the streaky one, and the problem went with the
    monitor, not stayed with the video card. I checked to see if that monitor
    had more than one input, and it does not. The cable is hard wired so I
    can't even try another cable.

    I'm curious, though. If the issue is ringing as you describe, why would the
    streaks only show up to the right of objects, rather than to both sides of
    everything?

    WT
     

  5. You may have some defective electrolytics in the power supply for the
    three video amplifiers that drive the CRT.



    --
    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
     
  6. bz

    bz Guest

    because the CRT beam sweeps from left to right.

    A sudden change in brightness produces a ringing AFTER the change

    |
    -------|||||---


    To the left would be before the change.




    --
    bz 73 de N5BZ k

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap
     
  7. Ahhh, didn't think about the beam direction. Thanks.

    WT
     
  8. John E.

    John E. Guest

    I'm curious, though. If the issue is ringing as you describe, why would the
    Your question is analog to "Why, when I take a photo of a fast car, does the
    blur only appear *after* the car and not before?". Or, "When I strike a bell
    with a hammer, why do I not hear anything before I strike it?".

    Ringing is the undesired result of an event continuing after it should have
    terminated.
     
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