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Extend the life the TV lamp

Discussion in 'Electronic Repair' started by [email protected], Sep 30, 2007.

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  1. Guest

    Does anyone know why the lamp goes out? My TV's lamp failed after 2
    1/2 years. I disassembled the lamp all the way to the wires to figure
    out what is wrong with it. I have concluded that the lamp is filled
    with inert gas and sealed with a cheap white compound, after this
    white compound is exposed to heat over many hours; it will
    disintegrate, cracks, and let the gas to escape leading to lamp to
    fail. Solution: SONY should seal the lamp using glass type seal that
    is used on the old type household light bulb. The lamp life should be
    extended to >50,000 hr.
     
  2. I assume this is a joke. Lamps go out because the filament eventually burns
    through.
     
  3. Eeyore

    Eeyore Guest

    I imagine he meant a cold cathode type backlight for illuminating LCDs.

    Graham
     
  4. James Sweet

    James Sweet Guest


    There won't be an incandescent lamp in a TV.

    Cold cathode fluorescent lamps fail because the cathodes wear out, usually
    the phosphor is depreciated by then as well.

    UHP lamps in DLP and LCD sets fail because the quartz arc tube devitrifies,
    they run about 3,000 PSI in operation and will fail catastrophically if run
    too far past rated life.
     
  5. My ignorance is showing
     
  6. Gary Tait

    Gary Tait Guest

    wrote in 22g2000hsm.googlegroups.com:


    The white compound does not seal the contents of the bulb inside it. It
    just adheres it to the reflector and other works.
     
  7. Adrian C

    Adrian C Guest

    Troll
    posting-account=ps2QrAMAAAA6_jCuRt2JEIpn5Otqf_w0
     
  8. Art

    Art Guest

    Certianly hope you did not mind handling the mercury (HG) during that
    procedure, BTW did you do in on the kitchen table also?
     
  9. James Sweet

    James Sweet Guest


    There's very little mercury in one of those lamps. I wouldn't sprinkle it in
    my food, but there's no need for the paranoia about it either. An old
    thermometer contains hundreds of times the mercury.
     
  10. Eeyore

    Eeyore Guest

    Our silly excessively risk-averse society has demonised such things without
    adequate reason.

    Now, if you were mining the stuff, that was different.
    http://en.wikipedia.org/wiki/Almadén

    Graham
     
  11. There's such paranoia about mercury when so many common chemicals are
    much more hazardous.....

    I used to play with mercury as a kid and look what happened... I turned
    into an engineer. Ooops. :)

    --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/
    Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
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  12. Meat Plow

    Meat Plow Guest

    Small amounts of mercury can be biologically manipulated into much more
    hazardous forms like methyl mercury. This has happened several times in
    history resulting in the poisoning of thousands of people.
     
  13. Jerry Peters

    Jerry Peters Guest

    I believe that a large part of the problem is that the current crop of
    journalists are almost totally ignorant of science and technology,
    even perhaps to the point of being afraid of them. Add all sorts of
    advocacy groups that invent their own "science" in support of their
    causes and you get our current situation.

    Jerry
     
  14. Eeyore

    Eeyore Guest

    In addition to ignorance you can add 'can't be bothered to research' to the list of
    skills held by journalists today. They'll happily reprint any old nonsense they're
    spoon fed.

    Graham
     

  15. You KNOW that you're not supposed to admit that online, Sam! ;-)


    --
    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
     
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