Electronics Forum | Sun Oct 29 22:41:29 EST 2006 | hanocete
We have a current problem on our packages after we bake it for 24 hrs prior BGA rework. Flux or white residues found on the connector leads and terminals that cause not contact problems during mating. Could you help us how to clean the fluxes properl
Electronics Forum | Mon Oct 30 21:43:08 EST 2006 | davef
So, after the repair of a BGA, you notice white reside on a nearby connector. Correct? [Sorry we're so dense. Long day.] Tell us about: * Flux class used in repair * Flux class used in original assembly Why are you baking the assembly after repair
Electronics Forum | Mon Oct 30 20:24:35 EST 2006 | davef
As we understand it, you: * Get some nice BGA from your supplier * Find BGA to be packaged properly * Bake the BGA for 24 hours at [what temperature?] to reduce the potntial for damaging moisture sensitive components during following processes * Remo
Electronics Forum | Tue Sep 17 15:59:48 EDT 2002 | Randy V
No-Clean fluxes are difficult to clean off boards. Cleaning effectivness depends on the washer, the chemistry, the flux type, number of reflows, and the time between reflow and washing. White residue is flux residues that have started to break down b
Electronics Forum | Mon Feb 03 11:17:55 EST 2003 | Randy Villeneuve
White residues are a common problem when cleaning no-clean fluxe residues. The white residue forms when the flux residue is partialy removed, etc. Alcohol should not be your only solution for cleaning. In general, solvents may attack some plastic par
Electronics Forum | Mon Jan 27 12:02:00 EST 2003 | Mike Konrad
Dave is correct. No-clean flux + water = white residue (unless the proper chemical is mixed with the water). Additionally, no-clean flux + IPA = white residue. Many saponifiers work well as do other cleaning agents. White residue may also be a re
Electronics Forum | Tue Jan 30 18:25:25 EST 2018 | aqueous
This is one of the most common questions I get asked. Why clean no-clean flux. It was stated earlier that no-clean residues are benign. This may or may not be accurate. It depends on several factors including the reflow process. In a perfect world, t
Electronics Forum | Fri Oct 13 05:21:08 EDT 2000 | Robert Steltman
Looking at the original post, it seems that the white residue is formed on the board after wave soldering and becomes evident when it has been left standing for a while. From what I understand, it seems that the solids content of the "no clean" flux
Electronics Forum | Thu Feb 01 17:34:45 EST 2018 | Mike Konrad
Thanks for the kind words Dave. At no point in my reply was I trying to sell anything. I apologize to anyone who believes otherwise. I agree with the poster, if assemblies are going to be cleaned, consider a flux designed to be cleaned. While this is
Electronics Forum | Fri Mar 02 16:47:39 EST 2001 | traviss
If the thinner you are using is 4662 and the correct amounts that should not be the problem. Is this the first solder operation? I would start by looking for rosen or no clean flux getting on the boards at some point before wave soldering and not bei
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