Re: Adjusting convergence on Sony Trinitron monitor

Discussion in 'Electronic Repair' started by David Nebenzahl, Feb 28, 2010.

  1. On 2/27/2010 9:48 PM Michael Shell spake thus:

    > On Sat, 27 Feb 2010 20:25:26 -0800
    > David Nebenzahl <> wrote:
    >
    >> Well, I tried cleaning the dust out of my Dell-branded Trinitron tube.
    >> In so doing I seem to have knocked the convergence out of whack, even
    >> though I was really careful vacuuming around the CRT.
    >>
    >> There's an on-screen convergence control, but even with it cranked all
    >> the way over (to 100/100 for the horizontal control, 76 for the
    >> vertical), there are still highly visible "ghosts" on screen.

    >
    > Try demagnetizing it first, especially if your monitor has a built-in
    > degaussing button. The next step is to degauss with an external
    > demagnitizer. There are TV degaussing coils for this (check Ebay), but
    > you might be able to make do with something like a bulk tape eraser
    > if you already have one.


    No bulk eraser, but I do have a couple of tape head demagnetizers;
    wonder if they'd do any good. But the monitor has a built-in degausser
    anyhow.

    > Color convergence problems will show up as red, blue or green outlines
    > and/or duplicate images - like when the colors don't align on newspaper
    > comic sections. If the ghosts you see are not in different colors,
    > then it is not a convergence problem. The focus control is often very
    > easy to unintentionally turn although a misadjusted focus control
    > generally causes blurriness rather than ghosts.


    It's definitely a convergence problem. I can see the colors shifting
    when I adjust the on-screen convergence control, but not far enough to
    eliminate the ghosts (which are definitely in different colors). The
    focus is fine.


    --
    You were wrong, and I'm man enough to admit it.

    - a Usenet "apology"
     
    David Nebenzahl, Feb 28, 2010
    #1
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  2. > There's an on-screen convergence control, but even with it
    > cranked all the way over (to 100/100 for the horizontal control,
    > 76 for the vertical), there are still highly visible "ghosts" on screen.


    My ViewSonic with a Diamondtron CRT also has two on-screen convergence
    controls. However, I suspect they're for tweaking. There are almost
    certianly other convergence controls within the monitor. You probably kocked
    one loose (so to speak) during cleaing.
     
    William Sommerwerck, Feb 28, 2010
    #2
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  3. "David Nebenzahl" <> wrote in message
    news:4b8a0cd8$0$2363$...
    > On 2/27/2010 9:48 PM Michael Shell spake thus:
    >
    >> On Sat, 27 Feb 2010 20:25:26 -0800
    >> David Nebenzahl <> wrote:
    >>
    >>> Well, I tried cleaning the dust out of my Dell-branded Trinitron tube.
    >>> In so doing I seem to have knocked the convergence out of whack, even
    >>> though I was really careful vacuuming around the CRT.
    >>>
    >>> There's an on-screen convergence control, but even with it cranked all
    >>> the way over (to 100/100 for the horizontal control, 76 for the
    >>> vertical), there are still highly visible "ghosts" on screen.

    >>
    >> Try demagnetizing it first, especially if your monitor has a built-in
    >> degaussing button. The next step is to degauss with an external
    >> demagnitizer. There are TV degaussing coils for this (check Ebay), but
    >> you might be able to make do with something like a bulk tape eraser
    >> if you already have one.

    >
    > No bulk eraser, but I do have a couple of tape head demagnetizers; wonder
    > if they'd do any good. But the monitor has a built-in degausser anyhow.
    >
    >> Color convergence problems will show up as red, blue or green outlines
    >> and/or duplicate images - like when the colors don't align on newspaper
    >> comic sections. If the ghosts you see are not in different colors,
    >> then it is not a convergence problem. The focus control is often very
    >> easy to unintentionally turn although a misadjusted focus control
    >> generally causes blurriness rather than ghosts.

    >
    > It's definitely a convergence problem. I can see the colors shifting when
    > I adjust the on-screen convergence control, but not far enough to
    > eliminate the ghosts (which are definitely in different colors). The focus
    > is fine.
    >
    >
    > --
    > You were wrong, and I'm man enough to admit it.
    >
    > - a Usenet "apology"



    If it does relate to degaussing, the built-in coil, while not strong enough
    to fix it on one or two tries, might get the job done over the course of
    time, which is to say, a certain number of degauss cycles. Sony CRT's can be
    damaged by conventional hand held coils, though in practice I've not seen
    this happen. I think that particular caution only applied to their larger
    CRT's.

    Mark Z.
     
    Mark Zacharias, Feb 28, 2010
    #3
  4. David Nebenzahl

    Baron Guest

    Mark Zacharias Inscribed thus:

    > "David Nebenzahl" <> wrote in message
    > news:4b8a0cd8$0$2363$...
    >> On 2/27/2010 9:48 PM Michael Shell spake thus:
    >>
    >>> On Sat, 27 Feb 2010 20:25:26 -0800
    >>> David Nebenzahl <> wrote:
    >>>
    >>>> Well, I tried cleaning the dust out of my Dell-branded Trinitron
    >>>> tube. In so doing I seem to have knocked the convergence out of
    >>>> whack, even though I was really careful vacuuming around the CRT.
    >>>>
    >>>> There's an on-screen convergence control, but even with it cranked
    >>>> all the way over (to 100/100 for the horizontal control, 76 for the
    >>>> vertical), there are still highly visible "ghosts" on screen.
    >>>
    >>> Try demagnetizing it first, especially if your monitor has a
    >>> built-in degaussing button. The next step is to degauss with an
    >>> external demagnitizer. There are TV degaussing coils for this (check
    >>> Ebay), but you might be able to make do with something like a bulk
    >>> tape eraser if you already have one.

    >>
    >> No bulk eraser, but I do have a couple of tape head demagnetizers;
    >> wonder if they'd do any good. But the monitor has a built-in
    >> degausser anyhow.
    >>
    >>> Color convergence problems will show up as red, blue or green
    >>> outlines and/or duplicate images - like when the colors don't align
    >>> on newspaper comic sections. If the ghosts you see are not in
    >>> different colors, then it is not a convergence problem. The focus
    >>> control is often very easy to unintentionally turn although a
    >>> misadjusted focus control generally causes blurriness rather than
    >>> ghosts.

    >>
    >> It's definitely a convergence problem. I can see the colors shifting
    >> when I adjust the on-screen convergence control, but not far enough
    >> to eliminate the ghosts (which are definitely in different colors).
    >> The focus is fine.
    >>
    >>
    >> --
    >> You were wrong, and I'm man enough to admit it.
    >>
    >> - a Usenet "apology"

    >
    >
    > If it does relate to degaussing, the built-in coil, while not strong
    > enough to fix it on one or two tries, might get the job done over the
    > course of time, which is to say, a certain number of degauss cycles.
    > Sony CRT's can be damaged by conventional hand held coils, though in
    > practice I've not seen this happen. I think that particular caution
    > only applied to their larger CRT's.
    >
    > Mark Z.


    Simply rotating the screen 15 - 20 degrees is enough to cause colour
    patches to come and go in the corners on my Trinitron tubed iiyama.
    The Trinitron tubes seem to be very sensitive to any magnetic
    disturbance.

    --
    Best Regards:
    Baron.
     
    Baron, Feb 28, 2010
    #4
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