Cleaning leaked electrolytic & corrosion on PCB
in [Repair]
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From: TralfamadoranJetPilot on 10 Apr 2010 22:59 On Sat, 10 Apr 2010 19:19:20 -0700, James Sweet <jamesrsweet(a)gmail.com> wrote: >David Eather wrote: >> On 11/04/2010 5:43 AM, John Larkin wrote: >>> On Sat, 10 Apr 2010 11:15:57 -0700, DaveC<invalid(a)invalid.net> wrote: >>> >>>> What is the best method for cleaning up leaked electrolyte? This PCB >>>> has some >>>> corrosion on IC leads and vias. >>>> >>>> Is there a corrosion neutralizer that would be effective? Since the >>>> potential >>>> for corrosion in places that aren't accessible (deep in the vias), a >>>> liquid >>>> that can neutralize corrosion is called for. >>>> >>>> Would something like DeOxit work in such an application? >>>> >>>> This is on a Tek scope acquisition board. >>>> >>>> Thanks. >>> >>> Dishwasher. >>> >>> John >>> >> >> You must be single. > > >You can always do it while the wife is out, it's not gonna damage anything. > >When I was a teenager I occasionally washed engine parts in the >dishwasher, not something I'd recommend, but my mom never found out. Just be sure to do a 60 C bake for about a half hour afterward.
From: Robert Latest on 11 Apr 2010 07:29 ["Followup-To:" header set to sci.electronics.design.] John Larkin wrote: > On Sat, 10 Apr 2010 11:15:57 -0700, DaveC <invalid(a)invalid.net> wrote: > >>What is the best method for cleaning up leaked electrolyte? This PCB has some >>corrosion on IC leads and vias. >> >>Is there a corrosion neutralizer that would be effective? Since the potential >>for corrosion in places that aren't accessible (deep in the vias), a liquid >>that can neutralize corrosion is called for. >> >>Would something like DeOxit work in such an application? >> >>This is on a Tek scope acquisition board. >> >>Thanks. > > Dishwasher. Excellent advice. A household dishwasher (with the normal powder detergent) is an extremely cheap and powerful cleaning device for almost anything. It took me a while to convince my ex-lab to use one for cleaning larger UHV parts rather than an appropriately-sized ultrasonic tank which would have cost the equivalent of 100 dishwashers. There are things that a dishwasher isn't good enough for, but they are few. robert
From: ian field on 11 Apr 2010 10:24 "James Sweet" <jamesrsweet(a)gmail.com> wrote in message news:hprbio$hj4$2(a)news.eternal-september.org... > David Eather wrote: >> On 11/04/2010 5:43 AM, John Larkin wrote: >>> On Sat, 10 Apr 2010 11:15:57 -0700, DaveC<invalid(a)invalid.net> wrote: >>> >>>> What is the best method for cleaning up leaked electrolyte? This PCB >>>> has some >>>> corrosion on IC leads and vias. >>>> >>>> Is there a corrosion neutralizer that would be effective? Since the >>>> potential >>>> for corrosion in places that aren't accessible (deep in the vias), a >>>> liquid >>>> that can neutralize corrosion is called for. >>>> >>>> Would something like DeOxit work in such an application? >>>> >>>> This is on a Tek scope acquisition board. >>>> >>>> Thanks. >>> >>> Dishwasher. >>> >>> John >>> >> >> You must be single. > > > You can always do it while the wife is out, it's not gonna damage > anything. > > When I was a teenager I occasionally washed engine parts in the > dishwasher, not something I'd recommend, but my mom never found out. It was a different story the one time I put a pan of trichloroethane on the gas ring!
From: Nico Coesel on 11 Apr 2010 06:16 DaveC <invalid(a)invalid.net> wrote: >What is the best method for cleaning up leaked electrolyte? This PCB has some >corrosion on IC leads and vias. > >Is there a corrosion neutralizer that would be effective? Since the potential >for corrosion in places that aren't accessible (deep in the vias), a liquid >that can neutralize corrosion is called for. > >Would something like DeOxit work in such an application? > >This is on a Tek scope acquisition board. Hmm, you bought a TDS5xx? There is a lot about cleaning these board on the Tektronix user forum on their website. -- Failure does not prove something is impossible, failure simply indicates you are not using the right tools... nico(a)nctdevpuntnl (punt=.) --------------------------------------------------------------
From: JW on 12 Apr 2010 05:48
On Sun, 11 Apr 2010 10:16:27 GMT nico(a)puntnl.niks (Nico Coesel) wrote in Message id: <4bc1a14f.1099558906(a)news.planet.nl>: >DaveC <invalid(a)invalid.net> wrote: > >>What is the best method for cleaning up leaked electrolyte? This PCB has some >>corrosion on IC leads and vias. >> >>Is there a corrosion neutralizer that would be effective? Since the potential >>for corrosion in places that aren't accessible (deep in the vias), a liquid >>that can neutralize corrosion is called for. >> >>Would something like DeOxit work in such an application? >> >>This is on a Tek scope acquisition board. > >Hmm, you bought a TDS5xx? There is a lot about cleaning these board on >the Tektronix user forum on their website. Many TDS 6XX scopes also had this problem. I run them through a dish washer first, then a Simple Green scrubbing followed by rinsing and blow dry using a compressor. After that I scrub 'em again with isopropyl alcohol, remove all the caps and replace with new ones. If it still doesn't pass it's diagnostics and SPC, start looking for open vias (usually black) and etches that are close to the areas where the worst of the leakage was. |