I will be more than glad to assist you with your matter.
I would like to double check:
Have you tested another PSU and you have faced the same issue?
Also, I would like to confirm if you have tried to connect your PSU to another Power Source?
Please try the previous steps, and let me know your findings.
Thank you for the reply.
I tested the device with several other PSUs and the electronic whining - which is a known and well documented issue with nearly every NUC - varied from barely not noticable to extremely loud.
With the PSU originally delivered along with the NUC5PPYH it was loudest - it even predominated the fan!
I also tried other power sockets with the same result.
Meanwhile I've returned the NUC to the vendor and was refunded so the issue is closed for me.
Thanks for your reply.
For what you have mentioned, you have been able to receive a refund for your NUC. I am glad to know that.
If you need further assistance at my end, or if you would like to close this thread please do not hesitate to let me know.
Hope I can hear from you soon.
I can confirm that nearly every NUC I've ever worked with (DN2820FYKH / D34010WYK / NUC5PPYH / NUC5I5RYH) had this annoying coil whining - some barely noticeable, some even louder than the fan!
For those who can hear it - particular younger people - it is extremely annoying.
Most annoying my NUC5I5RYH which is nearly screaming when in standby and under heavy graphics load.
First of all it seems to depend on standard dispersion among the NUCs how much a unit is affected.
One other heavy influence seems to have the power supply you use: The FSP PSUs which are delivered along with the NUCs make them whine louder while other power supplys reduce whining.
Also the use of multiple power plugs seem to have bad influence - especially if you use other AC adapters on it along with your NUC.
Try another power supply - some of my NUCs do whistle less with 12V input - others even more.
Using a foldable ferrit core on the power cable could also help a little bit.
There are also electronically stabilized power supplies which significantly reduce such coil whining - but they are very expensive.
At least you can wait until you are as old that you will not notice this high pitch noises anymore ;-)
I figured out that the replacing the PSU has the most positive influence to reduce this annoying coil/cpu whining!
The NUCs of the 4th generation (D34010/54250WYK) where delivered with brick type FSP PSU which where significant more quality-grade than the power-plug-type FSP065-10AABA which come along since NUC Gen.5.
My NUC5I5RYH went nearly silent by using a FSP090-DMBB1 now!
So please Intel: Please stop selling your NUCs along with this substandard thin-wired PSU - and while we're on the subject:
What is this 90° plug on NUC side good for? A straight coaxial connector would be much more practical!