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Repairing Switched mode power supply type welder

Discussion in 'Electronic Repair' started by [email protected], Jan 9, 2007.

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  1. Guest


    I am attempting to repair a Cebora Power Rod 1565 welder. This is a
    switched mode type device.

    One of the power MOSFETS is visabely blown. Where could
    I start looking for a supplier of this device. I only
    want a one off.

    Type W20NB50 made by ST.

    Thanks for any help.

    The company Cebors has a site at WWW.CEBORA.IT

    They supply a service manual to Authorized dealers only :-(

  2. Eeyore

    Eeyore Guest

    It's a common enough type with suitable substitutes also made by most major
    power semi vendors.

    Maybe if you said which country you live in I could help advise a source.

  3. Jim Land

    Jim Land Guest

    wrote in
    Digi-Key says:
    MOSFET N-CH 500V 20A TO-247 made by STMicroelectronics

    but they don't stock it.

    The NTE cross-reference at$$Search?OpenForm

    says you can replace it with an NTE2970, but that doesn't seem to be
    stocked either.

  4. James Sweet

    James Sweet Guest

    Make sure you check the rest of them as well, if one is blown, chances
    are more are bad.
  5. Eeyore

    Eeyore Guest

    These are pretty much generic parts. Not sure what the B means but most 20N50s
    should do the job I'd reckon.

  6. Eeyore

    Eeyore Guest

    Farnell don't have 20n50s but do have 20n60s.

    Don't mix up the IGBTs and mosfets. Also check what IR and STM have.

  7. Franc Zabkar

    Franc Zabkar Guest

    Try RS Components, part number 248-4242, ST part number STW20NB50.


    Otherwise Farnell appear to have the STW20NK50Z.

    - Franc Zabkar
  8. Guest


    Thanks very much for all the replys. I will order some FETS and see
    how I get on.

    There is a service manual for the welder available at WWW.CEBORA.IT
    but you need a password to access it.
    Have tried asking for a password to no avail:-(.

  9. Try or variations like
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