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Mitsbushi 21 inch monitor fault

Discussion in 'Electronic Repair' started by KWC, Jun 27, 2004.

  1. KWC

    KWC Guest

    I have a Gateway 2000 21 inch monitor which is the same as a Mitsubishi 21 inch
    monitor with a Trinitron tube.

    The picture now and then shifts one inch to the right. It does not distort just moves
    to the right. If I tap the case just above the screen it jumps back again without
    distorting. It does this about once an hour.

    Thinking that it must be a loose connection somewhere I have had the case off
    and checked all the connections and prodded various places with a non-
    conducting probe and I am unable to make the screen move at will.

    Could it be a heat problem? This would not explain how tapping the case above
    the screen makes it jump back into position.

    Has anyone any Idea what's going on and suggest a suitable fix if any?

    Thanks in advance.

    KWC

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  2. Jerry G.

    Jerry G. Guest

    This is probably a cold solder connection on the circuit board somewhere in
    the scan control area, or a component that has become mechanically
    sensitive.

    If you are not properly trained in monitor service and used to this type of
    work, you are best off to give the unit out for proper service. These
    monitors can be dangerous to work in, if you are not properly trained.

    --

    Jerry G. GLG Technologies GLG
    ==========================


    I have a Gateway 2000 21 inch monitor which is the same as a Mitsubishi 21
    inch
    monitor with a Trinitron tube.

    The picture now and then shifts one inch to the right. It does not distort
    just moves
    to the right. If I tap the case just above the screen it jumps back again
    without
    distorting. It does this about once an hour.

    Thinking that it must be a loose connection somewhere I have had the case
    off
    and checked all the connections and prodded various places with a non-
    conducting probe and I am unable to make the screen move at will.

    Could it be a heat problem? This would not explain how tapping the case
    above
    the screen makes it jump back into position.

    Has anyone any Idea what's going on and suggest a suitable fix if any?

    Thanks in advance.

    KWC

    Remove "My Hat" to reply
     
  3. James Sweet

    James Sweet Guest

    It's almost certainly a cold solder joint, but unless you tap in just
    exactly the right place it won't act up. You'll need some intelligent
    guessing as to where to look, I would start near the microcontroller, likely
    has a pin that leads to a transistor which drives the rest of the circuitry
    for controlling H size.
     
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