Let me put on my psychic goggles.
Please talk to the person you got the clock from before asking any more
questions about it here.
On 10/10/14 9:36 PM, Dman777 wrote:
Thank you. I didn't build the clock myself....so I ask this question,
why would the MOSFET of been replaced if it's a brand new kit?
Thank you,
-Darin
On Friday, October 10, 2014 11:30:40 PM UTC-5, nixiebunny wrote:
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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