How to fill chokes with epoxy / hot melt so that they do not whistle?

Question

Iron

UPD 2019:
Problem solved by disabling C1E via ThrottleStop.
On some laptop models, this can be done through BIOS.

Hello.
I have an ASUS ROG GL703GE laptop.
Everything is ok, but the chokes are whistling near the processor. Basically these two:


R47 (the one on the right) whistles 10 times louder than all the others combined.

Videos with examples of the whistle of this model: one , two , three .

Rented to SC. They didn't test anything, they just sent a request to Asus.
The answer came that this is the norm, accept it :)

I don’t want to put up, but I want to fill it with epoxy or hot glue like this:
https://www.youtube.com/watch?v=GNWmMjFZojE

Share your experience and thoughts on this topic.

What is better to choose: epoxy, AlSil-5, BF-2?

I guess it's better to choose an adhesive that hardens as it cures, right? From a flexible sense probably will not. Plus, you need to withstand temperatures up to 70-80 degrees.

So far I'm leaning towards epoxy. I'm thinking of mixing resin and hardener in a ratio of about 5:1. So it becomes very hard and almost does not react to temperature changes.

Another question is about thermal conductivity. Epoxy is not very good: 0.6λ, like plain water. On the other hand, this is many times higher than that of the air surrounding the chokes. Therefore, it is not clear how epoxy filling will affect the temperature of the chokes. Can you use some kind of non-conductive current filler?

Something like this))

Answer 1

isn't it easier to replace? or try pouring hot melt on top of the throttle (not bauxite, otherwise you won’t remove it later :-)
to fill it in, you need to unsolder it and disassemble it,
which I strongly doubt that it’s possible = most likely they are not collapsible.
PS
about thermal conductivity - there is nothing to burn there (BF will go
here video on the topic
https://www.youtube.com/watch?v=SOjlY_wlsZ8

Answer 2

No, these throttles just change.
Again, they are all the same from above, from below it can be either closed or open, in the second option you can try to fill it with epoxy.
But it is better to change, sooner or later the epoxy will give up to a high frequency and will be ground. :)

Answer 3

Magnetic parts usually make a sound for two reasons. The first is a magnetostrictive change in the dimensions of the magnetic circuit (for a real manifestation of this effect, the field must be very strong), the second is that in the area of ​​​​action of the scattered magnetic field there is something ferromagnetic and, moreover, flexible, which is attracted / repelled and thereby creates sound (approximately like a tin membrane on an old earphone).
In this case, judging by the photo, there is nothing ferromagnetic nearby, and the magnetic circuit is such that it keeps the entire field inside (there is no scattering or it is minimal). So, the reason is magnetostriction. It is impossible to weaken the field - the power pumped through the throttle will drop. This means that only soundproofing / sound absorption remains. These possibilities in the narrow interior of the laptop are minimal, so you need to choose the most effective substance for processing the inductor, and this is clearly not epoxy or hot melt adhesive.
In my opinion, it is necessary to take anti-noise mastic from those that motorists use to process the bodies of their cars. I'm not a motorist myself, so I can't give a specific answer. Google it, and then go through the surrounding auto cosmetics.

Answer 4

https://jsfiddle.net/52q4j3yj/

Answer 5

Open the console.

Answer 6

http://jsbin.com/