NERO, do this:
Send a 1.3ms pulse to your servo and see what happens.
Increase it to 1.35, then 1.4, 1.45, 1.5, 1.55, etc, and see what happens each time.
What you should see is your servo rotate one direction, stop, then rotate the other direction. If it doesn't do this, you are doing something else wrong. Let us know.
Depending on how you modified your servo, 1.5ms is just a rough guide for the stop position, and hardly a rule.