Electronics Forum | Thu Jul 09 10:34:49 EDT 2009 | davef
We can't tell from your picture that you have black pad, but it's not uncommon. Look here: * http://findarticles.com/p/articles/mi_qa5348/is_200606/ai_n21392950/?tag=content;col1 * http://www.pwbrc.org/members/pdf/works99/Houghton.PDF
Electronics Forum | Fri Apr 29 14:16:16 EDT 2011 | ppcbs
Below is the long explanation. This defect is most commonly found with BGA components, but can arrise with all components. I see it happening more now with lead free boards that are being assembled with a no clean flux. Best short term remedy is t
Electronics Forum | Wed Mar 01 17:05:34 EST 2000 | Dave F
Glenn: I hear you, but when Steve talks about a "dark haze" and "scrap(ing) the �black stuff� off the pads" to make them solderable, but I don�t think of "black pad." I think of "black pad" as a surface coating that typically can not be removed by
Electronics Forum | Wed Mar 01 17:05:34 EST 2000 | Dave F
Glenn: I hear you, but when Steve talks about a "dark haze" and "scrap(ing) the �black stuff� off the pads" to make them solderable, but I don�t think of "black pad." I think of "black pad" as a surface coating that typically can not be removed by
Electronics Forum | Fri Dec 29 16:05:56 EST 2000 | Dave F
I don't know how I ended-up reading a current trade journal, when I have a stack of intentions behind my desk a foot and a half tall, leaning like a paper Tower of Pisa threatening to avalanche itself onto the underfill materials study, a meager one
Electronics Forum | Thu Dec 14 19:32:05 EST 2000 | Dave F
Wow, someone read the fine SMTnet Archives!!!! Scary, get their name!!! [OK, I�ll stop ... Several points are: * Most of the stuff in the fine SMTnet Archives is all the bad things that we can make-up to respond to the questions people ask. Ther
Electronics Forum | Thu Mar 06 11:48:09 EST 2008 | muse95
Black pad with IAg??? Tarnish is NOT black pad. Tarnish is usually just some silver sulfide on the surface and can also usually be soldered through, by using a little additional, or slightly more agressive, flux, and still make a good quality solder
Electronics Forum | Wed Sep 20 19:30:15 EDT 2000 | Dave F
Consider searching the SMTnet archives. There's 30+ postings for black and pads. Good luck.
Electronics Forum | Fri Aug 26 09:57:21 EDT 2005 | russ
The Immersion gold is not a problem with BGAs specifically but "black pad" which can be present anywhere. The unfortunate thing with BGAs is you cannot see it. Personally I hate white tin. It is okay for single sided boards running no-clean, but c
Electronics Forum | Tue Jan 10 11:51:16 EST 2006 | jax
I don't believe I have ever seen a non-destructive test for "Black Pad" that I could take back to a Fab house and collect monetary losses with... But if this test method actually does hold merit then collect away. I would like to know how this metho
