Power Supply Hissing

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GoodGuyGamer

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Feb 11, 2019
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Hello, Everyone
The problem I'm having is with my PSU. When plugged in and switched off it produces a quiet hissing noise, and when switched on the noise gets a bit louder. Even when turning on the PC it still makes hissing noises. The PSU is the Cooler Master MasterWatt Lite 700W (EU version).

http://www.coolermaster.com/powersupply/masterwatt-lite-series/masterwatt-lite-230v-700w/

In my country, the Voltage is rated at 220v. This PSU is rated between 200v - 240v, and since it's sold here so it should work just fine. Also, I should mention that it ran off of a UPS unit rated at 1200VA (700W) and 220V output. The UPS runs fine when the internet router and monitor are plugged into it, but when the PC is plugged into it the UPS shuts down when the power goes out. (The hissing noise is produced whether PSU is plugged into wall or UPS). Thank you in advance for your help.
 

crjdriver

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Jan 2, 2001
Messages
40,805
Fan noise or coil whine. What exact pw supply do you have installed? Post the exact brand and model#
You can usually check for fan noise by stopping the fan. If you still get the noise, it is a coil, regulator, etc.
 

GoodGuyGamer

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Feb 11, 2019
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It is the Cooler Master MasterWatt Lite 700w 230v (eu version) model # MPX-7001-ACABW

If the pc hasn’t been turned on for a little while, plugging it in with the psu switched off makes no hissing noise. It starts hissing when the psu is switched on. When the pc is turned on the PSU fan turns on but its noise is different than the hissing which is now louder with the pc on. Interestingly, when the pc is shut down but is still plugged in, the psu makes the hissing noise whether its switched on or off. It only stops when it is unplugged. Thank you very much.
 
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crjdriver

Moderator
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Jan 2, 2001
Messages
40,805
If you are sure it is coming from the pw supply, about your only choices are to replace it or live with it. Again be sure of where the noise originates.
 
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