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I tried repairing a switch mode power supply. Whenever I measure the output, it gives the expected voltage rating. But when I supply it to a load, it does not give anything. What can be the problem? Please help. Thank you!

I tried repairing a switch mode power supply. Whenever I measure the output, it gives the expected voltage rating. But when I supply it to a load, it does not give anything. What can be the problem? Please help. Thank you!