Re: Conformal Coating on control boards not allowing me to solder

Hi.. as per my experience a lot of boards use solder with no flux in it so when you desolder a part use need to apply liquid flux first before you can heat up the joint. If the conformal coating was applied correctly it should not cover the solder joints. If it is covering the solder joints and you only need to desolder one cap you can use an X-acto knife to scrape of the coating just on the solder joints to get to the solder connection.

Re: xbox 360 blowing mosfet

Hi everyone..i am new to this forum. I am an engineer by profession and as per my experience PLL was use for FM radios so that when the frequency carrier started to drift a feedback circuit would correct it on the input oscillator. i think with a power supply that is frequency modulated the modulator has a tendency to drift so they are using the PLL to correct this error.