benjimaestro
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Raspberry Pi 2 making weird noises

Sun Apr 17, 2016 10:36 am

I have a Pi2, and it's making strange noises, like an HDD or something. Even weirder, I have no audio output, it's headless and there are no mechanical parts whatsoever. Why is it doing this?!

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DougieLawson
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Re: Raspberry Pi 2 making weird noises

Sun Apr 17, 2016 3:42 pm

Record a video of it singing it's tune, stick that on YouTube, post the link on here.
Note: Having anything humorous in your signature is completely banned on this forum. Wear a tin-foil hat and you'll get a ban.

Any DMs sent on Twitter will be answered next month.

This is a doctor free zone.

benjimaestro
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Re: Raspberry Pi 2 making weird noises

Sun Apr 17, 2016 4:18 pm

DougieLawson wrote:Record a video of it singing it's tune, stick that on YouTube, post the link on here.
I can't, phone mic won't pick it up.

hippy
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Re: Raspberry Pi 2 making weird noises

Sun Apr 17, 2016 4:28 pm

Another post on sounds coming from a Pi 2 board. Might be something useful there ...

viewtopic.php?f=63&t=102826

benjimaestro
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Re: Raspberry Pi 2 making weird noises

Sun Apr 17, 2016 5:43 pm

hippy wrote:Another post on sounds coming from a Pi 2 board. Might be something useful there ...

viewtopic.php?f=63&t=102826
Haha, this is funny.

I've made some tests and I can hear two different sounds coming from my Pi2 board. They are faint, but noticeable when in silence.

One sounds like a crackling, not unlike what a tiny hard disk drive would make, that seems to come from USB activity.
The other sounds like the tiniest steaming teapot, that seems to happen whenever sound is sent through the HDMI port. Executing the default python games (even the ones that have no sound!) will trigger it. And, of course, pushing actual sound through like when listening to online radios will trigger it.

Using CEA versus DMT or overclocking/overvolting versus default speeds/voltage doesn't result in different behavior.
Very similar to me. I have tried with a portable battery and wall power, nothing changes. Oh well.

edo1
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Re: Raspberry Pi 2 making weird noises

Sun Apr 17, 2016 11:03 pm

Are you sure about the sound source? Similar sounds could be produced by PSU

asandford
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Re: Raspberry Pi 2 making weird noises

Sun Apr 17, 2016 11:30 pm

I noticed the same thing on my Pi0 last night, when writing to the SD.

benjimaestro
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Re: Raspberry Pi 2 making weird noises

Mon Apr 18, 2016 4:28 pm

edo1 wrote:Are you sure about the sound source? Similar sounds could be produced by PSU
Absolutely. The exact same sound was made when using my wall source which was far away and my battery pack.

SpeederT12
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Re: Raspberry Pi 2 making weird noises

Mon Apr 18, 2016 6:05 pm

I know what it is, it's a common sign of a triggered evolution process. Quick, put it in a 15mm thick steel box and run away. It'll transform into a transformer and will try to eat your bagels. You have been warned

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0xFF
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Re: Raspberry Pi 2 making weird noises

Mon Apr 18, 2016 6:27 pm

Tere is L1 & L2 ferrite core coil on the PCB. This is probably a source.

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mahjongg
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Re: Raspberry Pi 2 making weird noises

Mon Apr 18, 2016 7:00 pm

actually the only parts on a PI2 that could create audible sounds, are the coils of the switching converters, and in theory some ceramic capacitors that could have a piezo-electric effect.

Silicon chips don't make any noise (except for a loud bang when you put much to much voltage on them, 240V AC on the 5V input for example :lol: ).

these noises should be very-very faint, but if you are unlucky and the board vibrates on a harmonic of the part it might get louder, and more distinct.

but this should not be anything you should worry about, at least not normally, if you put 5.7 Volt on a PI things could be different.

You could try if things change with another power supply.

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Burngate
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Re: Raspberry Pi 2 making weird noises

Tue Apr 19, 2016 10:14 am

Find a large* knitting needle, stick the blunt end against your ear, use the pointy end to locate the loudest component by touch.

* You don't want one small enough that it'll actually go in your ear - just so you get bone conduction. That's why I said large

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