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Fuzzy TV picture

Discussion in 'Electronic Repair' started by [email protected], May 12, 2007.

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  1. Guest

    Hi,

    My parent's crappy JVC "InteriArt" TV has developed an annoying
    problem where the picture becomes horribly fuzzy. The fuzziness
    depends on the colours on the screen - if there is a blue background
    it is incredibly fuzzy, but with colours approaching white it's almost
    completely clear.

    Could anybody suggest what is wrong with it, and if it could be
    repaired easily?

    Thanks.
     
  2. Guest

    Sorry, I didn't think this post through enough.

    By "fuzzy" I mean "blurry". And I should mention that it's a CRT
    television set.
     
  3. JANA

    JANA Guest

    Without properly verifying the set on the bench, it is difficult to make an
    accurate assumption. Usually, when bright or high contrast images start to
    be of soft focus, this is usually an indication of the picture tube going
    soft. As the tube ages and wears out, the emission will decrease. One of the
    effects is less sharpness in the image. Eventually, it will start going dim,
    and soon fail completely.

    --

    JANA
    _____


    Hi,

    My parent's crappy JVC "InteriArt" TV has developed an annoying
    problem where the picture becomes horribly fuzzy. The fuzziness
    depends on the colours on the screen - if there is a blue background
    it is incredibly fuzzy, but with colours approaching white it's almost
    completely clear.

    Could anybody suggest what is wrong with it, and if it could be
    repaired easily?

    Thanks.
     
  4. bz

    bz Guest


    Fuzzy indicates poor focus. Poor focus can be due to gas in the tube or to
    the wrong voltages on elements of the picture tube.

    Intermittently indicates that the voltage for some of the CRT voltages is
    changing.

    These voltages are normally regulated to prevent changes.

    When the voltages change with CRT beam current (for one or more of the
    beams), the problem could be with the CRT, with High voltage regulator,
    with components used to adjust the CRT beam currents or with the low
    voltage power supply.

    If it is the CRT, it is not cheap. Most other problems should be fixable at
    not too much cost.



    --
    bz 73 de N5BZ k

    please pardon my infinite ignorance, the set-of-things-I-do-not-know is an
    infinite set.

    remove ch100-5 to avoid spam trap
     
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