Electronics Forum | Thu May 05 12:31:27 EDT 2005 | russ
Not in this case, these BGAs were lead free and the profile used was for a lead part. I guess I will give you the whole story. These boards were sent to us from a customer to have the BGAs replaced for an unknown to us reason. We removed the parts
Electronics Forum | Thu Jun 20 04:49:34 EDT 2002 | scottxiao
according to the ressult of cross-section and removing the component, I find there is no black area in the left pad, and the IMC is also normal, so the black nickle is less impossible. the PCB material is not common FR4, just some thing like ceramic,
Electronics Forum | Tue Apr 13 11:41:18 EDT 2021 | jeremy_leaf
I have a SAC305 preform with which I am attempting to bond a gold coated component to an ENIG coated PCB pad. I've specified 2 microinches of gold for the ENIG. It worked previously but now with a new batch of boards, I am having an issue where the p
Electronics Forum | Fri Dec 08 00:02:35 EST 2006 | Jack
Hi all, I found this article (Dealing with "the black pad defect)about reworking bare PCB with black pad symptom...Use HASL to treat black pad..Have you guys try this before?? www.smta.org/files/SMTAI01-Jay
Electronics Forum | Tue Dec 05 07:00:05 EST 2006 | Jack
It is very common to relate ENIG pad surface finishing with BLACK PAD defect. However, is anyone know why BLACK PAD defect only happen on fine pitch pad areas suach as BGA, QFP? Why this defect did not or seldom happen on capacitor @ resistor pad??
Electronics Forum | Wed Jun 14 05:20:00 EDT 2006 | YQ DENG
How to check incoming bare PCB black pad phenomenon?
Electronics Forum | Mon Oct 20 14:17:35 EDT 2008 | robinj
The discoloration/shadow appearance is a clear sign of black pad which is from nickel corrosion in the gold bath.
Electronics Forum | Mon Oct 20 15:41:19 EDT 2008 | patrickbruneel
Josh, You can not check the bare boards for black pad unless you remove the gold plating. Like Robin said black pad is nickel oxidation/corrosion and a result from bad electroless nickel plating bath control. The only preventative action you take is
Electronics Forum | Wed Oct 09 12:29:14 EDT 2002 | ppcbs
We have been encountering black pad contamination on gold plated boards mainly affecting BGA components during assembly. This problem has been noticed with many of our customers that are using an array of fab vendors. Does anyone have a solution fo
