FC does not work

I bought a new engine this time.
I am glad I installed FC but it does not work.

During setting, fc does not respond suddenly while moving servo by rc.

GCS can not get any response from FC.

In stabilize mode, the tilt of fc causes the servo to move, but the servo does not move.

Of course, there is no reaction when you move with rc.

FC just gets in the light and does nothing.

Are you experiencing the same problem as me?

I want to test my helicopter as soon as possible.

What does “FC” mean?
Flight controller?

Yeah, that’s right.
It was a really simple problem.
I was using 6v for the 3.3v sensor, so the fc failed.
Lol … Stupid …