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Burning Power Supply

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And the failed part is rarely both the cause of the failure and the result of the failure.

What typically happens is that a capacitor or diode has shorted, pushing the transistor way beyond it's normal operating parameters. Or an inductor has overheated and shorted.

In general, these small cheap SMPS (switch mode power supplies) run on the 'ragged edge' and use components that are typically under-rated, and marginal quality. So if it fails, your best bet is to replace it.