Blue led light on grbl board not working

I have notice that my grbl led blue not working but X, Y, Z led activity is working fine during operation. Just that the LED blue light on my grbl is not working i have ordered and assembled it a few months ago.

I guess it’s possible the led blew out. odd but possible :slight_smile: as long as the machine is working ok

The blue LED is connected directly to the motor voltage and then to ground through a current limiting resistor. If you have motor voltage present but no blue LED then there could be a bad solder joint, a bad LED, or a bad resistor.

None of that will affect the way your machine works you just won’t have the LED to show that power is on.