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Welding machine burn resistors

Discussion in 'Repairing Electronics' started by manos555, Feb 3, 2017.

  1. manos555

    manos555 New Member

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    Feb 3, 2017
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    Hi there thanks for accepting me in the forum

    A friend bring me a welding machine (brand profi) yesterday when open the switch the machine start smoking and stop I disassemble and find that had burn 6 of 10 mosfet irfp460 and the 7 resistors of 15ohm 1/2 I replace them all when I power on in seconds blow up one resistor shut down I replace the resistor but the same thing not in the same but in other place I change 5 resistance but still the same I can see anything else be burned any ideas what happen ? need to replace the resistor with 15ohm 1w?

    I appreciate any help

    [​IMG] [​IMG] [​IMG] [​IMG]
     
    Last edited: Feb 3, 2017
  2. electronicartist

    electronicartist New Member

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    Apr 27, 2017
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    Looks as though the machine should still function. looks like the gate load resistor. you'll probally have to replace the transistor and the resistor.
     
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