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Apple 20" monitor troubles

Discussion in 'Electronic Repair' started by Jose V. Gavila, Apr 8, 2004.

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  1. Hello!

    I am having some troubles with my 20" ColorSync Apple monitor (which
    seems to be in fact a Sony Trinitron monitor). When you first power it
    up, image is about 15% smaller (both horizontal and vertical) than
    usual. But it slowly 'grows' to normal size. It takes about 5 minutes to
    reach correct size.

    It seems to me as an HV problem. What do you think?. What would you check?

    Thanks and best regards,

    JOSE

    --
    ----------------------------------------------------------------------
    73 EB5AGV / EC5AAU - JOSE V. GAVILA
    La Canyada - Valencia (SPAIN)

    Vintage Radio: http://jvgavila.com
    Vintage Test Equipment: http://jvgavila.com/testeq.htm
    European Boatanchors List: http://groups.yahoo.com/group/euro_ba_swap
     
  2. Jerry G.

    Jerry G. Guest

    There are some components most likely in the power supply, and or HV
    generator section that have become thermo sensitive. With proper
    troubleshooting of these sections, these components can be determined, and
    then replaced. There are a number of types that can cause this, therefore
    there is no point to guess at them, and change the wrong ones.

    If you are not experienced at TV and monitor service, an intelligent
    decision would be to take the monitor to a service centre that can do this
    type of repair for you.

    --

    Greetings,

    Jerry Greenberg GLG Technologies GLG
    =========================================
    WebPage http://www.zoom-one.com
    Electronics http://www.zoom-one.com/electron.htm
    =========================================


    Hello!

    I am having some troubles with my 20" ColorSync Apple monitor (which
    seems to be in fact a Sony Trinitron monitor). When you first power it
    up, image is about 15% smaller (both horizontal and vertical) than
    usual. But it slowly 'grows' to normal size. It takes about 5 minutes to
    reach correct size.

    It seems to me as an HV problem. What do you think?. What would you check?

    Thanks and best regards,

    JOSE

    --
    ----------------------------------------------------------------------
    73 EB5AGV / EC5AAU - JOSE V. GAVILA
    La Canyada - Valencia (SPAIN)

    Vintage Radio: http://jvgavila.com
    Vintage Test Equipment: http://jvgavila.com/testeq.htm
    European Boatanchors List: http://groups.yahoo.com/group/euro_ba_swap
     
  3. Hello Jerry,

    Thanks for your message!
    Well, I have repaired some hundred of electronic items, ranging from
    oscilloscopes to amateur radio gear so I consider myself able to get
    into this repair :). Perhaps my question was too broad... I thought
    somebody could have seen a similar trouble with a similar unit and could
    direct me to some suspicious components (it could be a generic fault).
    But, so far, it seems it is not that way and I should work in more
    general troubleshooting.

    Sincerely, I wanted to save some time as now I have lots of work in
    other items and that monitor is seldom used (but, OTOH, it is a really
    nice unit... when it works properly ;-)! )

    I will let you know what I find.

    Best regards,

    JOSE

    --
    ----------------------------------------------------------------------
    73 EB5AGV / EC5AAU - JOSE V. GAVILA
    La Canyada - Valencia (SPAIN)

    Vintage Radio: http://jvgavila.com
    Vintage Test Equipment: http://jvgavila.com/testeq.htm
    European Boatanchors List: http://groups.yahoo.com/group/euro_ba_swap
     
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