从命令行打开键盘LED

My main keyboard broke, so I extracted it's LED with circuit board. I'm trying to use this LED to illuminate my desk but i'm unable to turn on its light. At the old keyboard I would turn on the lights pressing fn + SL but my new keyboard does not have the fn key. Is it possible to simulate this command through my new keyboard? I noticed that the two keyboards are kinda synced, when I turn on num lock at my new keyboard the circuit board from the other also turns on.