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Welding machine burn resistors

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

  1. manos555

    manos555 New Member

    Feb 3, 2017
    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

    Apr 27, 2017
    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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