Electronics Forum: bga rework

Through Hole Pad contamination

Electronics Forum | Thu Nov 07 15:33:02 EST 2013 | mleber

Below are a few photos of an ongoing issue we are having with 1 pwb style. Some of the pads appear to have contamination that appears after the selective solder step. The joints are extremely hard to rework - almost impossible. We had the joints anal

Solder contamination on Golden Finger

Electronics Forum | Mon Aug 13 10:39:35 EDT 2007 | dphilbrick

If you can not find the source of cotamination then apply masking to fingers until you do find source, single layer of Kapton tape or similar should not affect print thichness. This will eliminate scrap / rework in the mean time.

Silicon contamination in solder joint

Electronics Forum | Tue May 27 12:40:50 EDT 2003 | davef

Hi Bill You said, "silicon". We assume by your discussion that you ment to say, "silicone". For background on silicone and soldering, check with Dow Corning [517-496-6000]. They make a OS2 [VOC-free] silicone stripper and should be able to give y

About the PCB gold finger contamination.

Electronics Forum | Thu Sep 19 21:17:50 EDT 2002 | Sam

We had encountered similar problem before. But the cause was found out to be the poor good plating, instead of contamination. The way we dealt with that was sending them to the supplier for rework. It may be the fastest and most relaibility way. Goo

Counterfeit/Reworked Parts

Electronics Forum | Fri May 21 15:36:05 EDT 2010 | ccross

That is exactly the type of problem we are having. Some work, some dont. We feel these parts are not counterfeit so to speak but reworked, removed from other boards, cleaned up to some degree - hence the flux residue, black contamination, scrapes, wr

oil contaminated PCB cleaning

Electronics Forum | Fri Feb 05 14:29:14 EST 2010 | kaz

the board in question is from Foba Laser Engraver, it's a surface contamination coming from.. everywhere, a lot of moving parts that are lubricated. I'm now studding chemicals that we may use for our kind of rework & cleaning. We may think of modifyi

Cleanliness: Cross Contamination of Flux

Electronics Forum | Wed Sep 12 20:46:16 EDT 2007 | Mag10

We've configured SMT and Wave lines such that each line can run either No-Clean and Water soluble process. As we are doing cleanliness study, an observation is there may be cross contamination when we share the Rework benches or PCB trays between No-

Lead-Free SMD repair

Electronics Forum | Mon May 23 23:21:18 EDT 2005 | magkel

HI guys, I am new to this forum, Earlier author is asking regarding of Lead free rework. 63-37 is non lead free and this will contaminate the product itself. I do not know what are the components that you are facing to rework with. But try to set th

Use lead-free alloy wire during rework for Leaded Process

Electronics Forum | Tue Oct 31 22:09:25 EST 2006 | davef

The is a serious concern of lead contamination of leadfree solder connections. For background, search the fine SMTnet Archives. For instance: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=30307

Contaminate PCB surface

Electronics Forum | Tue Nov 29 11:09:59 EST 2011 | Shean Dalton

Siaomuay, What is your flux and peak reflow/rework temperature? Do you use chemistry in your cleaner? Regards, Shean Dalton

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