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Ic L6563H  BLOWN ALL THE TIME

manzoor

Hi I have a fujistu  desktop power supply dead . So I open testing all component in primary section and found fuse blown 250v 8amp. Mosfet 23nm60n blown . Ic L6563h blown other all component are tested ok so I replaced all with new one. Which I bought from online aliexpress.  But the problem is same mosfet and ic again blown . There smd resistor smd capacitor  all value are tested ok rectifier and all component. Then I again replace and the problem is same. Does any one faced problem  like this please share I feel ic which I bought from aliexpress is not genuine which caused blown

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  • There are many possible faults that will not show up with simply testing on board with a multi meter. (For example shorted turn or failed insulation in a transformer or inductor).

    If there is a fault in a later section of the supply that could still make the L6563H fail.

    And it could have been a duff chip.

    The L6563h is pretty cheap - might be worth another go with one from Mouser or Farnell.

     

    MK

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  • There are many possible faults that will not show up with simply testing on board with a multi meter. (For example shorted turn or failed insulation in a transformer or inductor).

    If there is a fault in a later section of the supply that could still make the L6563H fail.

    And it could have been a duff chip.

    The L6563h is pretty cheap - might be worth another go with one from Mouser or Farnell.

     

    MK

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