MINHLE, What exactly is the question? Are you concerned that the voltage across the led is too low? What is the value of the resistor in series with the led? Do you have any resistor in series with the led at all? If there is no resistor in series with the led then the current is too great for the PIC and the voltage is being dropped too low for the oscillator to operate... What is the voltage across the 2 PIC pins you are using to drive the led? You should start out with maybe a 680 Ohm resistor in series with the led and see if that doesnt cure the problem...

Dave Purola,
N8NTA