New power supply clicks

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Matthew Renna

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Jan 24, 2017
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I just bought a seasonic focus 550 watt. It replaced a corsair CX 500.
Whenever my pc boots or wakes up from sleep, the power supply makes a click. It also does this when it turns off or goes to sleep. The old power supply never did this.
What is this?
 
Solution
Dark Lord of Tech
http://forum.corsair.com/v2/showthread.php?t=127387

Newer PSUs do this because you have a relay that essentially switches power from the +5VSB to the normal +5V between the off and on modes of the PSU.

So.. you have things like keyboard, mouse, etc... anything that's USB based, that uses +5VSB when the PC is "off". Once you turn on the PC, that is switched over to the +5V rail. Problem with the sound is that it also uses +5V, but not +5VSB, so it's getting a bit of juice that jumps from one rail to the other as you're shutting down and that causes some residual sounds in your speakers.
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Dark Lord of Tech

Dark Lord of Tech

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Aug 18, 2009
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http://forum.corsair.com/v2/showthread.php?t=127387

Newer PSUs do this because you have a relay that essentially switches power from the +5VSB to the normal +5V between the off and on modes of the PSU.

So.. you have things like keyboard, mouse, etc... anything that's USB based, that uses +5VSB when the PC is "off". Once you turn on the PC, that is switched over to the +5V rail. Problem with the sound is that it also uses +5V, but not +5VSB, so it's getting a bit of juice that jumps from one rail to the other as you're shutting down and that causes some residual sounds in your speakers.
 
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