Hi guys!
I bought recently 3 servos SG90 and just tested them with the code to swing the arm from one side to the other.
One of the servos works perfectly fine as it should but the other 2 servos do not move at all. What could be wrong here?
Are they blocked any way? Is there a procedure to unblock them?
Thank you!
Which Arduino board are you using and how are are the Arduino and servo powered ?
I’ve had very poor luck with SG90 inexpensive servos.
MG996R servos seem to be a bit better quality.
Most likely something in the connections, code, hardware (complete project basically) which you do not show.
Hi, @jmira
Can you please post your code?
Can you please post some images of your project?
So we can see your component layout?
Can you please post a copy of your circuit, a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, power supplies, component names and pin labels.
Have you swapped servos around to check if it is a circuit/software or servo problem?
Thanks.. Tom.. 
Thank you all!
I just solved the problem. I went back to the store where I bougth them and exchanged them im warranty.
The new ones work perfectly.
Thank you once more!
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