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Lenovo Employee ccchen
Lenovo Employee
Posts: 292
Registered: ‎09-03-2018
Location: US
Views: 207
Message 11 of 13

Re: ST50 7Y48 PSU fan not running

Hi GrumpyMike,

 

For ATX-250W, it is the PSU hardware design for power saving when the system is in a low load level.

 

Thank you for choosing Lenovo.

 

GrumpyMike
Fanfold Paper
Posts: 6
Registered: ‎05-31-2019
Location: GB
Views: 206
Message 12 of 13

Re: ST50 7Y48 PSU fan not running

Thank you.

Can you please confirm also that the fan should not even rotate slightly at power on?

Thanks,

Mike.
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Lenovo Employee ccchen
Lenovo Employee
Posts: 292
Registered: ‎09-03-2018
Location: US
Views: 181
Message 13 of 13

Re: ST50 7Y48 PSU fan not running

Hi GrumpyMike,

 

The PSU fan only rotates when the PSU output watts and the temperature reaches certain conditions.

 

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