Cursitor Doom wrote:

On Wed, 16 Mar 2016 11:45:04 -0700, DaveC wrote:

€œchecked out fine...€� means you tested what? Capacitance? ESR?
In-circuit? Removed?

Visually?

No signs of bulging or seepage.

I was just taking a closer look at the board a moment ago under a glass
and spotted something that requires further investigation. Going to have
to get my stereoscope out of storage for this one. Tiny clusters of what
look like *very* fine gauge enamel copper wire clearly bridging across
vias in various points around the board and obviously not *supposed* to
be there.
Woo Hoo! Sounds like tin whiskers! The conformal coat is "SUPPOSED" to
suppress the whisker growth, but there are quite a few reports that the
whiskers just poke through the coating, they ARE real sharp.

Jon