L.E.D. (Light Emitting Diode)...
All LEDs can and will go bad, just like JPR said... Diodes, like any component (transistor, resistor, capacitor, etc.) will go bad from age, electrical spikes, heat, or any number of reasons we cannot explain.
Pull that flasher open, and look to see if it has an aftermarket LED "bulb" in the socket... they frequently fail due to cheap parts, high heat, and most importantly, un-regulated voltage... Pop-in LED bulbs can be bought at the local parts store, Wal-mart, etc. IF you want to install another one (which will likely fail again, especially if it is a cheap one).
If you have an actual "wired" LED module, trace the wiring back to a bad wire, poor connection, etc. you can also test the LED unit with a 9V battery and a couple of wires to jumper to the connections on the back of the unit. If it lights by 9V battery... LEDs are good, and wiring or fuse or harness are at fault.
And yes... WELCOME!
2002 VT1100C2 Sabre
1985 VT700C Shadow
1999 CB750 NightHawk (son's ride)
"The Hardest Part About a Zombie Apocalypse, Will Be Pretending I'm Not Excited