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Need to repair many IBM G74 Monitor, Model #6547-0AN

Discussion in 'Electronic Repair' started by ferkee, Apr 12, 2005.

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  1. ferkee

    ferkee Guest

    I am part of an I.T. shop for a company that has many many many of thes
    IBM G74 monitors. They are gradually starting to all have problems

    1. Very dark - Brightness/Contrast controls are not effective an
    are maxed out
    2. Display wider than screen - Width adjustment has very littl
    effect

    We have so many, but I'd like to figure out what to look for and how t
    repair them. I'm really starting to feel stupid and wasteful when w
    are told to just "junk 'em" and get another. They're fantasti
    monitors. I am sure the company (or at least the organization that
    support) would be somewhat impressed if I could repair them with littl
    trouble and expense.

    The other rather embarrassing fact is that I have a EE degree! It wa
    almost all book-smarts if you know what I mean and was not reall
    electronics, per se. I have not been in the electronics nor th
    engineering world since 1991! I have a FLUKE DMM (at home...don't hav
    the model # with me) and I have soldering tools. I actually have acces
    to an entire workforce of component people (our value add shop), but I'
    like to eventually do this myself.

    Can anybody help me here?


    Thanks,
    John

    PS, I'm in the DFW area (Dallas/Fort Worth, Texas
     
  2. NSM

    NSM Guest

    Some monitors have an extra adjustment on the circuit board.
    Indicates 'blooming' of the images. See

    http://repairfaq.ece.drexel.edu/REPAIR/F_tvfaq5.html

    http://repairfaq.ece.drexel.edu/REPAIR/F_tvfaq7.html
    That'll cut you no slack in any repair shop.
     
  3. Ross Herbert

    Ross Herbert Guest

  4. James Sweet

    James Sweet Guest

    For the brightness problem, look at the heater in the neck of the tube, is
    it glowing normally? If not then you might have a bad capacitor in the power
    supply. If the heater is ok and HV is present, chances are the tube is shot.

    For the width issue look for a bad capacitor somewhere around the horizontal
    section.

    Oh and do NOT under any circumstances try to adjust out either of the faults
    unless you want to make the monitor not worth repairing.
     
  5. Franc Zabkar

    Franc Zabkar Guest

    According to the Google Groups archives, the width problem is due to a
    3.3uF non polarized 65V capacitor.

    http://groups-beta.google.com/group/sci.electronics.repair/msg/3c5efd6875333540?dmode=source


    - Franc Zabkar
     
  6. Do they have Samsung blue-label CRT's? If so, that's the problem.

    Tom
     
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