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wrote:

Hello,

I have a dead 5V power supply from a Linksys router. It is making a
very high pitch "whining" sound. I opened up the unit and noticed one
of the caps is deformed (the top of the cap is more rounded). What
could cause this high pitch sound? Is it the cap or other component?

Probably mostly the transformer core. That's not the problem though. You need to
replace that cap first. Make sure you use a low esr type designed for switchers.

Graham