> I don't know what to say about ionic contamination either, I have noIonic contamination creates low impedance shorts all over the board.
> idea what it is ;) How does it effect a board? Does it rot the
> FR-4?
Sometimes they will not exist when you first power the board up, but can
show up in a matter of hours. Low levels can cause clock drift, or
intermittent oscillator startup.
Very frustrating.....
Ron