I am getting some clicking noises from my synthian.
I have tried running it on battery so it is not the PSU.
Any ideas?
Is it a standard build using only parts from the Zynthian official kit? If there are any non standard parts then post a picture. It could be a timing issue with the sound card. Under what conditions does this occur? A bit more detail required 
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Standard V3 kit. New.
Happens all the time. Just when connected. Also on battery.
I can post pictures tonight.
Try SSH to Zynthian and stopping Zynthian software with:
service zynthian stop
If the sound persists then you will have ruled out a software issue and can concentrate on the hardware (which I suspect this is).
You should stop jackd service too:
systemctl stop jack2
I never heared such a sound in a zynthian. I will bet that is hardware related.
Plug & unplug the soundcard, disconnect internal audio harness, etc … and cross your fingers 
Regards!
BTW, the noise is the same in both channels (left & right)?
Yep both channels.
I’ll troubleshoot tomorrow.
Thanks.
This has something to do with the grounding and the screen.
If I take the upper half of the Zythian off but leave everything connected then there is no hum/noise,
If I let the metals touch the hum returns.
It does not matter if I disconnect the encoders.
Any ideas?
If I unscrew the screen it is so unaudible it will now be in recordings,
So it must be the screen that is “leaking”
But before you didn’t have this problem …
What triggered the problem?
Could you try to isolate the display from the case by adding some plastic rings under the nuts?
Regards,
Yeah. Had it from the beginning, just it was a noisy psu. But then I tried using a battery. No change. It wasn’t as loud, it grew louder.
I was planning on getting some plastic screws. Just don’t know where I would find them. I’ll check Monday.
But this is abnormal right?
This is the noise
Perhaps the noise is coming from the audio input. There is an amplifier there …
Have you checked the audio input levels in alsa mixer? Try to disable audio input …
I’ll check it out.
But the screen fix almost fixed it. This is so weird. Haha.
There is one thing that bothers me. If I unplug the output I get a huge static noise in my amplifier. Much more than if I were to unplug the jacks. Could it be a faulty plug?
Hello @Humi,
while your first recording indicated something related to charging noise of a capacitor,
your video recording seems to have just noise in it.
You would get just noise if the audio in is turned loud and routed to the output…
Can you verify all parts of your zynthian are connected properly and there are no additional contacts because of lengthened pins that have contact to the case? Just a guess here…
Greetings and God bless, Marius
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I’m closing this thread.
I eliminated most of the noise when I isolated the screen from the casing.
Now I bought a verified PSU and the rest of the noise* is gone.
I dont know if it was the PSU all along, rather doubt it. you would have recognized it then.
*I have to turn my preamp up to 80% to hear it, I don’t see that I am going to use that setting, I’m always btw. 20-40%
Case closed but not solved
Onwards and upwards!
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Hey just wanted to tag on here because I had a similar issue. I noticed that buzzing feeling of electricity when I touched the case.
I went searching for answers, found this thread, followed the advice, and seem to have fixed my problem. Here’s what I found:
The RPi and case didn’t match up exactly perfectly, causing the side of the case to touch the USB power outlet. I put thin washers below the RPi to give it about 0.5mm more height. I also used shrink-tubing between the case and the usb receptacle and more shrink tubing on the male end of the cord that goes in it so that no metal touches the case.
In my situation I don’t think it was the screen - even with the case disassembled and top and bottom apart, I still felt electricity on the bottom case. But probably something is touching somewhere where it shouldn’t, I just can’t figure it out. Checked over all the cables three times and eventually just went with “isolate the power supply from case”.
Thanks for this thread, it helped me. Maybe this tidbit will help someone else.
Zynthian rules.
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Nope, I spoke too soon. The electric buzz is back and now I get sounds again. Any ideas where to look? Obviously something is not grounded right and leaking current all over the box.