Ic L6563H BLOWN ALL THE TIME

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

dougw over 5 years ago

Excessive load on the power supply can cause power supply components to die.
The root problem may be with whatever the power supply is supplying power to.
Is the power supply output shorted, or very low impedance?
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manzoor over 5 years ago in reply to dougw

Thanks for reply
I check all the component and there is not any component short. Also the power supply is with out load tested
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michaelkellett over 5 years ago

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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