Switchers

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Sneakers Switchers Swatches These things are everywhere. Sometimes called (the unfortunate name of) wall warts.

Tips/Techniques

Diodes Gone Wild

He has a number of videos that diagnose broken switching power supplies and is reasonably knowledgeable about them.

Example of 5V 8-pin DIP Regulator

https://www.eevblog.com/forum/repair/need-help-to-identify-a-blown-chip-in-skynet-for-z12c-switching-power-supply/msg5445107/ It's always easy to spot the capacitor and diode.