files sweep for servo not working

hi i just recently trying arduino uno r3
i try using basic like blinking, running motor through l293 here's no problem

then i use servo, which is 2 pieces hobbyking s0361 digital mini servo and springrc s3317b analog

on s0361 the servo run to the edge angle and still pushing if i continue supply the power
while s3317b not running at all

and when i feel depressed and comment all loop so leaving behind just servo.attach()
the mini servo still running

when i tried with led i see the led slightly dimming and then shining again

i use 4.8v external power from my old avr board which supplied from 12v 500mA adapter for servo

and usb for arduino uno

can somebody help me?
thanks in advance
and sorry if i ressurect this topic if it already exist

Hi,

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Can you please post a copy of your sketch, using code tags?
They are made with the </> icon in the reply Menu.
See section 7 http://forum.arduino.cc/index.php/topic,148850.0.html

We can't help you until we know what you are using.

Tom... :slight_smile:

It sounds like a power issue. It's possible that you didn't power your servos correctly or at all. Double check the wirings.

It's not likely, but in case you provided higher voltages to your servo it might have burned its circuit, which the servo will operate in the similar buggy way.