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Transistor´s heatsink is live.

Discussion in 'Electronic Repair' started by onyxx, Sep 28, 2005.

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  1. onyxx

    onyxx Guest

    I´ve check the transistor but is fine (this is a chopper tansistor
    from a SMPS from a 15^ monitor) can the chopper transformer be shorted
    to ground? How can I find out? I´ve red about ¨ring test¨ but some
    of the equipment listed I do not have.
    Is the only cause of this a short to ground? Can there be something
    alse happening?
  2. James Sweet

    James Sweet Guest

    Yes, or if you accidently bump it with your knuckle while probing elsewhere
    on the board, ouch indeed!
  3. Hi,

    what kind of problem do you have with the monitor?

    Is the heatsink connected to ground?
    I have an AT power supply, where the chopper transistor has a metal
    backside, connected to the 300VDC from the rectifier.
    So the heatsink is live under normal condition. (Quite a surprise if
    someone wants to feel for the temperatur. Ouch.)

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