After a hard crash where I had to replace my shell and one motor (not the crashed corner) I also replaced the ESC for the bad motor. Now the ESC on the crashed corner won't display any colors on LEDs. Bird flies fine just no LEDs on that arm. Any ideas?

There's a 4 pin plug on esc to transport LED signal, please check that.

I had a similar issue where in my case only the green LEDs failed to light up. I confirmed it wasn't the ESC plug, and replaced the entire ESC as it was obviously damaged.

thanks, replaced ESC, all set now