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Just as you would with any other damaged or otherwise failed power supply: find out which component(s) has (have) failed and replace it (them).
I'm not deliberately trying to be obtuse, but the question fails to take into consideration that there are many possible causes for the failure of a power supply.
The fault could be caused by something as simple as the failure of a diode or it could be as encompassing as the failure of several components at once.
Modern electronic repair has become a business of replacing entire assemblies. Often it's more cost effective to simply replace the entire failed component; in this case, the failed power supply.

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15y ago

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