Noisy Raspberry (19300 Hz sound emission)

[Dominique GEORGES]

Hi,

I have 2 Raspberry 4, using passive thermal protection.

I had headache and did not understood why.
Using a decibel meter with frequency monitoring, I discovered that both of them where generating high frequency sound (noise) signal (between 19.200 and 19.350 hz).

I taught the first one was dying, I booted the second one and .. same issue.

At boot time, signal is there +/- 40 db, which is not low.

Powering it off stops immediately the generated signal/sound.

Is that a "normal" behaviour ?

Thanks i advance.
Kr,

Dom

[ejolson]

Hi,

I have 2 Raspberry 4, using passive thermal protection.

I had headache and did not understood why.
Using a decibel meter with frequency monitoring, I discovered that both of them where generating high frequency sound (noise) signal (between 19.200 and 19.350 hz).

I taught the first one was dying, I booted the second one and .. same issue.

At boot time, signal is there +/- 40 db, which is not low.

Powering it off stops immediately the generated signal/sound.

Is that a "normal" behaviour ?

Thanks i advance.
Kr,

Dom

Thanks for posting. This seems like it could be a problem, not only for people with good hearing but for various pets that might be in the house. I wonder if the Pi 400 is also affected.

[Dominique GEORGES]

I tried without any passive thermal protection (during a few seconds )

Just powering it generates immediately sound signal : 19.230 -> 19.340 Hz

What strange is, my third Raspberry 4 is not suffering of that issue.

I presume the signal frequency may help expert to pointout the source.

It starts directly at power ON.

Fortunately, I just have a cat an no dog.
But I presume my cat is also suffering from that issue.

Please help my .. cat

PS : These Raspberry are running HomeAssistant, and have issue

PS : All 3 are Raspberry Pi 4B 4GB

Kind regards,
Dom

[jdb]

Are you using the same power supply between the noisy boards and the "quiet" board?

[LTolledo]

can you share an image of the display of that "decibel meter with frequency monitoring" showing the "suspected value"

is the data display plotted against time?

[Dominique GEORGES]

Are you using the same power supply between the noisy boards and the "quiet" board?

Yes, indeed.

And, using another powersupply modifies the signal strength, and witdth !

Thus powersupply is part of the root cause.

High frequencies 19.300 Hz

Rapberry PI-B 4G - Hautes fréquences-min.jpg (194.09 KiB) Viewed 110 times

Kr,
Dom