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Discussion in 'Electronic Repair' started by Vince, Mar 5, 2007.

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  1. Vince

    Vince Guest

    Hi!
    This set is a magnavox kitchen TV DVD AM FM MdlMDR700137 , the screen is
    dark but if you shine light on it you can see the picture, the contrast
    and brightness don't have any effect on it , I need to know what kind of
    source it uses to light up the screen,
    Thank you
    Vince
     
  2. James Sweet

    James Sweet Guest


    Most of them use CCFL tubes. If you open it up and look at it, it should
    be obvious. Inverter failure is common but the tubes can wear out too.
     
  3. James Sweet sez:
    To add a little detail...

    The CCFL is a thin (some as small as 1/4 inch diameter) fluorescent lamp that
    runs the entire width (usually) of the bottom of the screen. It's usually
    taped tightly to the screen with copper tape and not always easily
    accessible. I'd bet it's the driver board (inverter) that has failed. This is
    much more accessible and I'd test the output of this before tearing apart the
    display to get at the bulb.

    Good luck,
     
  4. The inverter output is highfrequency and voltage and may damage some
    digital meters.
     
  5. James Sweet

    James Sweet Guest


    Easiest to test with another lamp, you don't have to install it in the
    display to test the inverter.
     
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