Low voltage warning. Please check your power supply
I’m getting this warning message on my Raspberry Pi 3b+.
I checked the voltage on the 5V header pin with a multimeter, and it was 4.83V, Raspberry Pi should be able to work on 4.75V. So I checked the online forums, apart from the voltage actually being low, some suggested that the warning could be triggered by an older micro SD card, and some suggested to upgrade/update the OS. So I first tried to update the system, and used the following command:
sudo apt-get update && sudo apt-get dist-upgrade -y
However, this did not solve the problem. I’m using an I.T.E Power Supply (5V, 3.0A), and before this I tried another one also rated 5V, 3.0A. Apart from this warning, the Pi seems to work fine.
Then I noticed that the little yellow lightening bolt sign isn’t on all the time, it showed up during power-up, and when I open an application. After this, the lightening bold is gone, but the warning message remains. So I again checked the voltage, and it did drop to 4.77V. As this was measured with a multimeter, and the drop is transient, it may have dropped below 4.75V, so the warning is legitimate. What is causing such a power drain is not clear. Even though it says it’s an I.T.E (Information Technology Equipment) Power Supply, perhaps it’s not as good, and isn’t regulated.
I bought another power supply [NorthPada Raspberry Pi Power Supply With Off Switch and LED Light] from Amazon, and it solved the problem.
On The Same Network
Setting up Raspberry Pi
If VNC isn’t enabled, go to Raspberry Pi Configuration and enable VNC as below:
On Raspberry Pi, click on the VNC icon in the top right corner:
This will open the VNC Server window as below:
You will need the IP address shown under Connectivity from this window.
Setting up Viewer
Download the VNC viewer from here www.realvnc.com/en/connect/download/viewer.
When you open the VNC Viewer, write the IP address which was shown in the VNC Server on the Raspberry Pi as below and press Enter:
You will be asked the username and password for your Raspberry Pi. If you have not changed the password, default username is pi and password is raspberry.
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