Lightning Bolt (Under-Voltage Warning) on Raspberry Pi

If a lightning bolt image appears in the top-right corner of the screen, it means Raspberry Pi is not getting enough voltage (4.65V according to this forum post). To prevent it from showing up, there are two options.


1) Replace Power Supply and/or Cable (Recommended)
In most cases, it’s due to the power supply and/or cable. Replacing those with better one such as CanaKit 5V 2.5A Power Supply or HomeSpot 5V 2.4A Power Supply will most likely fix the problem. I like HomeSpot because it has ON/OFF switch, which is very convenient to power up Raspberry Pi.


2) Disable Under-voltage Warning (Not Recommended)
Under-voltage may cause SD card corruption and/or other problems. Disabling the warning won’t make it any better. But if you understand the risk, it can be disabled by the steps below. I tested it with Raspbian Stretch (November 2017 version).

Open /boot/config.txt file.

Add below, save and close the file.

Reboot to apply the change.



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