Most likely you pushed the hot swap switch off the PCB. Which means a soldering job.
I watched videos about that, is it the one you will traced the circuit using a circuit pen or something like that?
whats the best to do in this situation? should I leave it?You don't need to trace it to find it; I'd have to see your keyboard in person to know for sure, but seeing an all-black hole usually means you pushed the hot swap socket completely off.