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Is my monitor really broken?

Discussion in 'Electronic Repair' started by [email protected], Nov 12, 2006.

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  1. Guest

    I recently acquired a Sun GDM-90w10 (rebadged Sony w900) 24" widescreen
    crt. It is very old (manufactured Dec '97), but it was in remarkably
    good condition and worked beautifully.

    Tonight I returned home and switched it on, to find that while it made
    the clicking noises that it usually makes as it starts up, it didn't
    come on. Instead of the tube powering up with the typical "bong" noise,
    it made an extra click noise, and the green light switched off, to be
    replaced by the light next to it blinking orange. This LED has a symbol
    that appears to be a crossed out lightbulb.

    When I bought the monitor, there were no manuals for it, and the best I
    could find on the internet was a <a
    href="http://www.sunshack.org/data/sh/2.0...ces/Monitor/MONITOR_Color_24_Premium_CRT.html">spec
    sheet</a>, so I have been unable to find what this flashing LED means.

    I do not believe that there should be anything physically broken in the
    monitor, as (to my knowledge) it hasn't been moved since I used it last
    week, but I can't be sure.

    Did my monitor just meet it's inevitable end and wear out? Can anyone
    help? Is all hope lost?
     
  2. Jim Land

    Jim Land Guest

    wrote in
    Reliability: 110K Hours MTBF (mean time between failures) according to
    the web page

    2006 - 1997 = 9 years
    9 years * 365 days/year * 24 hours/day = 79K hours

    So... it's about time it failed, if it were on 24/7. If it wasn't then
    it's still young, in theory. In any case, try to find out what broke,
    and what it would take to fix it. 24" monitors are not cheap to come by!
     
  3. b

    b Guest

    ha escrito:
    sounds like protection possibly due to a fault in the line stage.
    desolder the HOT and connect a 100w bulb c-e- see what happens.
    -B.
     
  4. Mike

    Mike Guest

    in my humbile opinion, certain sonys just dont last long.


    I had a trinitron monitor last for long period of time. VERY long.

    then ive had some that only last a year or two.

    seems the newer the monitor is, the less long it lasts. quality has gone
    down drastically over the years.
     
  5. lj_robins

    lj_robins Guest

    Try unplugging it for ten minutes, then try again.

    If it still doesn't work try it on a different computer and see what
    happens.

    Do you hear it crackle when it powers up, will static cling make paper
    stick to the screen, if not did it used to?


    -Landon
     
  6. Guest

    The monitor crackles normally, but it doesn't seem to make any static.
    It sounds like it tries to turn on, but a breaker/relay clicks at the
    last minute.
     
  7. b

    b Guest

    ha escrito:
    do the bulb test and post results. have you measured any of the power
    supply lines? you'll have to give us a few more indications if you
    expect useful suggestions
     
  8. Dave

    Dave Guest

    The extra "click" you heard was the AC main power relay being powered off.

    I don't know why nobody has suggested it (I am NOT a repair professional,
    feel free to correct me if I'm wrong) but if was a TV, you'd have a bunch of
    posts telling you that some protection circuit had kicked in and that, given
    the age of the unit, perhaps you'd be wise to check your electrolytic caps
    in the power supply. Like a television, your monitor has a protection
    circuit which monitors various voltages. If it detects either over or under
    voltage (or DC voltage in some cases) it shuts down the unit to avoid
    damage. There's a fair bit of heat generated inside these monitors, and
    electrolytic caps DO dry out over time... If your SMPS voltages are all
    okay, a shorted HOT would definitely give you similar symptoms.

    If anybody has a schematic for you, it will save you countless hours.... but
    I know Sun isn't that forthcoming with hardware manuals.

    Dave
     
  9. James Sweet

    James Sweet Guest


    Some also have a shutdown that detects lack of deflection, most monitors
    have separate HV and horizontal circuits so if the horizontal deflection
    transistor is shorted, cold solder joints, etc the monitor will have
    similar symptoms.
     
  10. Guest

    Hi :

    I have some technical PDF for gdm-w900 and similar. If you need I could
    send to you (I think it's the same monitor).

    I wish you can repair it.

    If you finally decide not to repair it I would ask you about the
    possibility to buy you one of the internal circuits from this monitor,
    the D Mount or D Block circuit (Deflection circuit). My monitor still
    works but I have a problem with this circuit and it's burning fast.

    Please tell me if you want the PDF files.

    Best regards,

    Francesc
     
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