On Linux check this directory.
If there are subdirectories, look inside for a file called
trigger file will list the available LED control parameters, with the current one surrounded by brackets.
To change the trigger parameter, just write the name of the parameter to the
brightness can be used to disable to LED as well. Writing
brightness will shut off the LED that that particular subdirectory controls.
To disable all controllable LEDs as a test, you can try this command:
sudo echo -n 0 > /sys/class/leds/*/brightness
If you cannot control the LEDs this way, unplugging the board may be the only way.