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Faulty Colour TV

Discussion in 'Electronic Repair' started by Robert, Dec 18, 2003.

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  1. Robert

    Robert Guest

    Does anyone have any suggestions regarding causes and solutions:

    My fairly new Goodmans 32" Widescreen TV has recently developed a
    fault with its colour output. Every so often the whole screen will
    take on a yellowish-green tint which affects all channels and even the
    channel display information. The problem is still noticable when I
    turn down the colour settng to minimum.
    I tried changing the output on my SKY receiver to RGB and this seemed
    to work for a while but the problem has now re-surfaced. The only way
    to reset the colour is the switch the set off and then on again.
     
  2. James Sweet

    James Sweet Guest

    When that happens do you lose red entirely? If so it could just be a bad
    solder connection on the neck board.
     
  3. Robert

    Robert Guest

    I phoned my brother who suggested that I remove the scarts and blow
    out any foreign particles that might be in there. It hasn't done it
    since so I'm keeping my fingers crossed.
     
  4. The set is loosing the blue channel. This can be anything from a cold
    solder in the video path to a failing component. It may even be a bad
    tube.

    The basic way to see where the fault may be, is to see if a cold
    solder connection can be traced down. While the fault is occuring,
    check the supply and bias voltages to the elements of the electron
    guns of the tube(s).

    If the basic approach did not work, the best way to fix this is to
    take the set appart, and when the fault happens to use a scope to
    trace out the video path to see where the signal loss is. Depending on
    the model, some extender jigs may be required to gain access to the
    underside of the boards, and run them at the same time.

    If you are not trained in TV service, and do not have access to the
    proper test equipment, I would suggest you call an experienced service
    tech to give you an estimate for repairs. This way you can make an
    inteligent safe decision about sericing your set.

    Jerry Greenberg
    http://www.zoom-one.com
     
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