Noise CPU

[Ombun]

My CPU I5 - 1135G, 11-th generation make an electrical noise during I use the laptop, with changing intensity. Is it normal? I mention that the mainboard was replaced în service, but the problem persist and it is not about the cooler movement. 

[WAWood]

@Ombun 

I don't want to start an argument with you -- but a CPU has no audio output, so it has no way of generating any sound.  I have no idea what you mean by "electrical noise".

Since you had the mainboard replaced, the best course of action is to contact those people to have then check out the laptop to see what is happening.  We have no way to access it or diagnose any issues with it from here.

[Ombun]

Hi! Thank you for your answer.

I listened carefully to the sound and it sounds more like a buzz with different intensities. I understand that the processor does not make any sound and yet something is heard. The service changed the motherboard and they tested the system ok. However, that buzz is present. I read on the site that it would still be the processor that makes such noises when it changes working frequencies. I do not know what to think!

[WAWood]

@Ombun 

I have a variable speed AMD processor and it does not make any noises at all when it rams up from a slower speed to a faster one.

It could, now that you mention it, be a side-effect of the processor ramping up, cause more heat, causing the fan to speed up, and the resulting noise is the fan vibrating at the faster speed to cool down the hotter processor.

I don't know what else to suggest.

[Ombun]

The noise is present all the time, at a various intensity, no matter if the fan is working or not.

It is for sure that the noise is in the motherboard area. First I supose because of the CPU, but now, after these answers, maybe  guilty of this are some inductors? The noise is like when you pass unde the high voltage power lines, if you know.

I read that some videocard can make electric coil noise, but now is not the case having Intel Iris Xe on board videocard. 

Whats next? 

[CWCowser · Accepted solution]

It would be really uncommon and your hearing would have to be excellent, but you might be hearing inductor whine from the power supply in the computer. This was really common with old power supplies back in the late 90s and early 2000s. When I was a kid repairing desktops with my dad I was sensitive to the sound of induction. Now There is no way I'd be able to hear it with the hearing damage I've had through the years.

If it is inductor whine try plugging your laptop into a surge protected power supply, a power conditioner, or an isolating battery backup. They can all help clean up the power being delivered to your power supply and make the sound created by the induction lower.