[TriEmbed] soldering oxidized pins - QFN part

Glen Smith mrglenasmith at gmail.com
Wed Jan 27 11:36:57 CST 2016


After the pencil eraser my next step (if needed) would be a nylon bristle
or wire wheel in a Dremel tool. I used mine recently to clean up some
battery contacts damaged by Alkaleak batteries. A light touch would be
essential, but I'm betting this would rejuvenate the chips pretty quickly,
with no need for caustics.

Glen

On Wed, Jan 27, 2016 at 11:49 AM Mauricio Tavares via TriEmbed <
triembed at triembed.org> wrote:

> On Wed, Jan 27, 2016 at 11:21 AM, Jeffrey Crews via TriEmbed
> <triembed at triembed.org> wrote:
> > It might be worth it for someone at Tri or Splat to score some "crocus
> > cloth." It's like ultra-fine emery (actually red rouge-impregnated stiff
> > cloth) usually used for polishing fine/soft metals like gold.
> >
> > I used to have some and it was awesome because it didn't damage anything
> or
> > remove gold or other platings.
> >
> > Come to think of it, I'll get some.
> >
> > JSC
> >
> > On Wed, Jan 27, 2016 at 11:12 AM, Carl Nobile via TriEmbed
> > <triembed at triembed.org> wrote:
> >>
> >> If you have some really fine non-metallized sandpaper you could give the
> >> part a few twists on the paper first.
> >>
> >> ~Carl
> >>
> >>
> >> On Wed, Jan 27, 2016 at 10:57 AM, Alex Davis via TriEmbed
> >> <triembed at triembed.org> wrote:
> >>>
> >>> I have a QFN part which shows signs of oxidation on the pins, and I'm
> >>> wondering if there's anything I can or should do to clean it up.
> >>> Unfortunately, it's an old-stock part, so I can't just get a new one.
> >>>
> >>> I have some photos here of the part:
> >>>
> >>>
> https://hackaday.io/project/9150-68040-upgrade-for-powerbook-520c/log/30827-68040-has-arrived
> >>>
> >>> I am hoping there's enough un-oxidized metal on each leg that the
> solder
> >>> and flux will wet the legs properly. I'll be point soldering a few pins
> >>> on each side before drag soldering the rest, so I should be able to
> >>> evaluate if it's going to work before committing to soldering the whole
> >>> thing.
> >>>
> >>> Alex
> >>>
> >>>
> >>> --
> >>> "The theater of noise is proof of our potential."
> >>> |\ |  (¯  \/ |¯\  |V| |\ ¯|¯ |¯) | \/ | | | |¯\ (¯   /¯  /\ |V|
> >>> |-||_ (_  /\ |_/ @| | |-| |  | \ | /\ |^| | |_/ (_ . \_  \/ | |
> >>>
> >>> You won't find me on Facebook.
> >>>
> >>> _______________________________________________
> >>> Triangle, NC Embedded Computing mailing list
> >>> TriEmbed at triembed.org
> >>> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
> >>> TriEmbed web site: http://TriEmbed.org
> >>
> >>
> >>
> >>
> >> --
> >>
> >>
> -------------------------------------------------------------------------------
> >> Carl J. Nobile (Software Engineer)
> >> carl.nobile at gmail.com
> >>
> >>
> -------------------------------------------------------------------------------
> >>
> >> _______________________________________________
> >> Triangle, NC Embedded Computing mailing list
> >> TriEmbed at triembed.org
> >> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
> >> TriEmbed web site: http://TriEmbed.org
> >>
> >
> >
> > _______________________________________________
> > Triangle, NC Embedded Computing mailing list
> > TriEmbed at triembed.org
> > http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
> > TriEmbed web site: http://TriEmbed.org
> >
>       How about the eraser on a #2 pencil?
>
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>
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