[SOLVED] Moode on my Raspberry Pi 3B, shows undervoltage

[srmood]

Good day, forum members.
I am new to this forum.
My name is Martin, I am a pensionado and I live in The Netherlands.

Because of the good reviews about Moode, I choose to install it on my Raspberry Pi 3B.

I use my 3B with a HifiBerry DAC+ Light and a special Linear Power adapter, for getting clean audio.

Yesterday I installed the latest version of Moode (64-bit), using the option in RPI-Imager.
I connected a mini screen using HDMI to my 3B.
But after the login option (without logging in) it keep showing 'hwmon1 undervoltage detected'.

On the Power adapter connector I measure a voltage of about 6.2 V.

I also tried with the older 32-bit version (downloaded first and using Custom option in RPI-Imager), but then I also saw the same message on the screen - before the screen became black.

Would somebody have an idea what I can do about that problem?

Thank you in advance.

[Tim Curtis]

Under voltage warnings usually indicate the Pi is not receiving enough amps from the PSU. IIRC the Pi3 requires a minimum of 2.5A.

[srmood]

Under voltage warnings usually indicate the Pi is not receiving enough amps from the PSU. IIRC the Pi3 requires a minimum of 2.5A.

@Tim,
thank you for your reply.

Sorry I forgot to mention; the label on my PSU says: 5V/2.5A, so that should be good.

Any more thoughts?

[Tim Curtis]

Maybe it's the 6.2 volts. The spec on the Pi is for 5V.

IIRC anything over 6 volts should blow the fuse on the Pi's voltage regulator circuit otherwise it could cause damage to other circuits on the Pi. Are you using the micro USB power connector (which has the regulator circuit and fuse) or the GPIO pins?

[TheOldPresbyope]

Actually, 6.2V suggests to me that it is a cheap, no-name "5V" power supply with poor voltage regulatiion. It probably has undersized wires in the interconnecting cable as well. It's the voltage and current delivered at the Pi connector which count.

Get a genuine Raspberry Pi power supply and save a lot of headache.

Regards,
Kent

[srmood]

@Tim,
the 6,2V I measured 'unloaded'. But maybe that could be to much indeed.
I am using the micro-USB connector.

@Kent,
the adapter is an iFI IPower model LN-0530 - special ment for getting clean audio, which I bought in France - and it was expensive, not cheap.

[Tim Curtis]

If you have a decent switch-mode Pi power supply, either an official one or a good quality after market unit, give it a try and see if the under-voltage messages continue to appear. If not then it would suggest some sort of issue with the iFi unit.

[TheOldPresbyope]

If that’s the unloaded voltage then i don’t consider it suitable for Pis, no matter the cost. The RPi power supplies work reliably for me and I don’t seem to be suffering from  “dirty” audio.

Just my 2 cents worth.

Regards,
Kent

[srmood]

@Tim, @Kent,
thank you both for your contributions.

I will try a standard original RPI power supply then.

[srmood]

Hi,
I just found the problem.
I replaced the extension cable from de adapter plug to micro-USB (which was included) with another extension cables: from the adapter plug to USB-A (which also was included) and another extension cable from USB-A to micro-USB (which I had in my drawer) - and no more undervoltage messages.

So it turns out the first extension cable is faulty.
Problem solved.

Thanks for your thoughts.