[Manoel]

If the servos are turning freely, they are probably not connected to the RC at all (if they are connected to the right PWMs, they should be trying to track the target. If they were connected to an unused PWM output, the combination of power and a neutral - 127 - signal wouldn't allow them to be easily turned.)

We get the symptoms you describe (nothing pops up at the terminal) when the battery is dead, or when the camera has been turned on after the robot. A fresh backup battery in the first case or a reset in the second case should do it.

If that doesn't help, then you probably have a bigger problem.