Darin,
That is the MOSFET. It's been replaced, which is what the brown stuff on
the bottom of the board came from. That's residue from solder wick
braid, and from solder.
None of this stuff is the least bit problematic. If it was me doing the
work, I would have cleaned it off with isopropyl alcohol and a cotton
swab before shipping the clock.
Don't worry, it's not acid core solder. That looks different.
On 10/10/14 9:05 PM, Dman777 wrote:
That is a big relief....thank you. Here is a picture of where those
right legs are exactly soldered to on the other side. From what I can
gather, this would be the closet part to the heated concentrated
area...although the heat area seems is a little more off to where the
tubes are. Not sure if it's because the air is traveling out the circle
openings?
Thanks,
-Darin
On Friday, October 10, 2014 8:53:05 PM UTC-5, Arne Rossius wrote:
Hi,
Dman777 wrote:
> Using my camera and zooming in, I see some strange markings on
PCB board
> surface and some brown/burn spots also. Could this have anything
to do with
> the heat concentration? What are these from? I attached a couple of
> pictures.
The brown gooey-looking stuff is probably flux residue from soldering
the component (which is on the other side). The component warms up the
flux residue and it turns from transparent or yellow-ish to brown. This
is nothing to be worried about, but if you want to get rid of it you
can
clean it off with some isopropanol.
By the way, is that the footprint of the MOSFET? If unsure, take a
picture of the same spot from the other side of the board. This would
confirm my suspicion that it is the main heat source.
Best Regards,
Arne
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