Electronics Forum | Tue Jun 13 08:18:52 EDT 2006 | davef
Search the fine SMTnet Archives for background on black pad. If you have black pad on your boards, return them to your supplier.
Electronics Forum | Tue Jun 13 13:42:34 EDT 2006 | Bob R.
Also be careful in assuming you have black pad. A nice straight crack along the Sn-Ni intermetallic is probably just overstress at some process (most likely ICT). The better board suppliers figured out how to avoid black pad years ago.
Electronics Forum | Mon Jun 19 21:40:52 EDT 2006 | davef
While underfilling BGA "mounted" on blacked pad boards could improve the reliability by attaching the BGA to the board, you should believe that all components soldered to the board will be affected by the black pad, not only BGA.
Electronics Forum | Mon Oct 20 13:34:10 EDT 2008 | patrickbruneel
Picture (img133) sure looks like black pad. Maybe you can compare the pic's yourself with the pictures in the ITRI Report on black pad. http://www.pwbrc.org/members/pdf/works99/Houghton.PDF
Electronics Forum | Mon Oct 20 17:06:43 EDT 2008 | davef
Patrick You're correct that black pad analysis is a distructive test. Kicking the lead-free dog certainly is easy [and somewhat fun] to do, but black pad is an equal opportunity defect. It affects leaded boards as well as it does with lead-free.
Electronics Forum | Tue Jul 29 09:47:40 EDT 2003 | davef
We agree with Russ and Ioan that rework does not cause black pad. It's caused during the board fabrication process. On the other hand, we think: * Mantis wants to reduce the amount of reworking of boards that fail due to a black pad problem. *
Electronics Forum | Fri May 23 23:58:48 EDT 2014 | edriansyah
Hi Hege. I was not also too confident with the black pad (coz no black residue on the remaining pad). But based on my search on the internet regarding black pad. Most of them shows a very clean BGA Pad after peel off the BGA as the picture reference
Electronics Forum | Tue Jan 10 17:10:35 EST 2006 | mdemos1
JAX: Thanks for the reply. We did send one of the boards back to the bare board supplier and they do concede that it is black pad. When you inspect the assembled board under a microscope, you can easily move the entire solder joint away from the p
Electronics Forum | Tue Jan 10 08:50:07 EST 2006 | Amol Kane
I read a paper somewhere that outlines a non destructive test for black pad detection. it showuld be on my hard drive. Black pad is as a result of impurities in the plating bath and poor process control. I shall dig up the paper and mail it to you if
Electronics Forum | Tue Jan 10 08:07:45 EST 2006 | mdemos1
Hi. We have experienced black pad phenomenon on a lot of 200 boards (immersion gold finish). This lot of boards has been completely assembled and we had about 20% fallout during functional test. My question is this ... Is there a way to inspect th
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