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Sony GDM-F400 CRT FD Trinitron Fault

Discussion in 'Electronic Repair' started by Mike Myers, May 9, 2004.

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  1. Mike Myers

    Mike Myers Guest

    Hi,

    Take a looksie :)

    http://www.firedome.karoo.net/IMG_0003.JPG

    Look closely and you will see what appears to be interference, I promise you it
    isn't. If the monitor is switched off then back on for a split second the
    screen is sharp, in focus and without these lines. Then the monitor goes
    haywire. It seems to be worse when then monitor displays lighter colours and
    especially white.

    Is it fixable? :)

    Thanks,

    Mike
     
  2. David

    David Guest

    Fixable? Yes.
    At what cost? Unknown until it is properly diagnosed by an experienced and
    qualified technician.
    Most minor monitor repairs are at least $75 for things like a single bad
    capacitor or a solder connection issue. Repair costs typically go up from
    there. Is the monitor worth fixing? Unknown. Is it worth at least paying
    for a quality estimate? Possibly if it is a 19" or larger.

    From the very limited information available in the picture, I would start by
    troubleshooting the power supplies and high voltage supplies.

    David
     
  3. John Gill

    John Gill Guest

    Mike:
    To me, it looks like an electrolytic capacitor is bad. I had a 19" CTX
    last week that had a simular problem. It turned out to be a 1000Uf/16V
    capacitor had gone done in value to about 50Uf.
    I would start by checking the caps in the secondary of the power supply
    first. Then check the ones in the horizontal/vertical sweep section.
    And finally check those on the CRT neck board.
    An ESR meter comes in handy here to check the caps in circuit.
    John
     
  4. Mike Myers

    Mike Myers Guest

    Thanks for that, will see if I can track down someone who can look at it,
    failing that in the bin she goes :D

    Cheers,

    Mike
     
  5. Mike Myers

    Mike Myers Guest

    Incidentally would that be consistent with a squeal/whine/static type noise
    coming from the cap or location of where the cap is (I cant actually see
    without taking the shielding all to bits).

    It seems worse when the screen displays more white for some reason...

    Hmm..

    Thanks,

    Mike
     
  6. Jerry G.

    Jerry G. Guest

    All monitors are fixable. It depends on how much you want to invest in
    repairs.

    This looks like a fault in the power supply, horiz scan, and or high voltage
    sections. It is also possible that the HV multiplier may be defective.
    This type of fault would require proper troubleshooting. You would have to
    bring the monitor in to a service centre to have it repaired. You will not
    be able to service this yourself.

    Since it is a very good model, and if the CRT is in good condition, It may
    be worth to service it. You would have to have an estimate done in order to
    make an intelligent decision.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    Hi,

    Take a looksie :)

    http://www.firedome.karoo.net/IMG_0003.JPG

    Look closely and you will see what appears to be interference, I promise you
    it
    isn't. If the monitor is switched off then back on for a split second the
    screen is sharp, in focus and without these lines. Then the monitor goes
    haywire. It seems to be worse when then monitor displays lighter colours and
    especially white.

    Is it fixable? :)

    Thanks,

    Mike
     
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