The Raspberry Pi has some built-in LEDs such as PWR and ACT. There may be reasons for this such as saving power (albeit not much) and to remove visual indicators in certain environments
This tutorial explains how to turn off built-in LEDs on Raspberry Pi 4.
Raspberry Pi 4 Model B has integrated power LED (PWR), activity LED (ACT) and two Ethernet socket LEDs: link LED (LNK) and activity LED (ACT). The following table presents the purpose of each LED:
| No. | LED | Color | Description |
|---|---|---|---|
| 1. | PWR | Red | Power indicator. This is on if the power is over 4.65V |
| 2. | ACT | Green | Memory card status indicator. This blinks during memory card activity. |
| 3. | LNK (Ethernet) | Amber | Ethernet link indicator. It is always on when Ethernet is connected. |
| 4. | ACT (Ethernet) | Green | Ethernet status indicator. This blinks during network activity. |
Raspberry Pi has a configuration file /boot/config.txt which contains parameters that are read when the Raspberry Pi boots. Open this file like this:
sudo nano /boot/config.txtAdd the following lines to the end of the file to turn off built-in LEDs on Raspberry Pi when it boots. The values are different from a 3 to q 4
Raspberry Pi 3B
# Turn off Power LED
dtparam=pwr_led_trigger=default-on
dtparam=pwr_led_activelow=off
# Turn off Activity LED
dtparam=act_led_trigger=none
dtparam=act_led_activelow=off
# Turn off Ethernet ACT LED
dtparam=eth_led0=14
# Turn off Ethernet LNK LED
dtparam=eth_led1=14
YAMLRaspberry Pi 4B
# Turn off Power LED
dtparam=pwr_led_trigger=default-on
dtparam=pwr_led_activelow=off
# Turn off Activity LED
dtparam=act_led_trigger=none
dtparam=act_led_activelow=off
# Turn off Ethernet ACT LED
dtparam=eth_led0=4
# Turn off Ethernet LNK LED
dtparam=eth_led1=4Reboot Raspberry Pi in order the changes to take effect:
sudo reboot