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Unstable vertical hold and buzzing on sound on tv

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

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  1. Martin

    Martin Guest

    The tv is a Contec colour tv. Picture is randomly unstable
    vertically and a buzzing noise is superimposed on the sound.
    This happens as soon as the tv is switched on. The symptoms are:
    holding for a few seconds and then fast rolling; sometimes stopping
    and holding halfway with a half inch gap separating the top and bottom
    of the picture running across the centre of the screen with what I'd
    call 'noise' in this gap - thousands of white flecks filling this half
    inch gap (don't know if that's normal, but it looks as if it is
    associated with the buzzing coming out of the speaker).

    I have checked for and fixed bad connections and also replaced the
    vertical sync IC without effect.

    Any suggestions for further troubleshooting the faulty component very
    much welcomed.

  2. Sofie

    Sofie Guest

    Martin, you might want to now focus your attention on the PS........ check
    the electrolytics for high ESR and replace as needed....... also check and
    replace if necessary the regulator.
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