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monitor problem

Discussion in 'Misc Electronics' started by exxos, Jun 14, 2004.

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  1. exxos

    exxos Guest

    Hi all,

    I have a gateway 700A monitor which is dead. At first it was just "ticking"
    about once a second, I found a shorted line transistor which I have
    replaced. Now it makes a odd "zip" sound, sounds to start at a high
    frequency then slop down fast in about half a second, then goes off, then
    comes back a second latter. Seems it is tripping out for some reason. There
    is no heater voltage apart from the time where is making the zip sound, then
    it jumps up and goes off again. Sounds to me like the LOPT is faulty ? I
    dont think they can be tested, only think ive done is check the HT cap to
    ground, which reads something like 1902 on diode test, so it don't seem
    shorted ? I've checked most of the diodes and transistors and higher wattage
    resistors and haven't found anything apart from a slightly duff solder joint
    on a diode which goes to the collector of the transistor I changed, any idea
    what else I can check before I resort to lugging it into work to be checked

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