Electronics Forum | Thu Aug 21 22:10:07 EDT 2003 | adlsmt
Well, for some reason the board house will pay for the boards but has some issue with paying for the parts on them. Why am I not supprised? Perhaps I have mis-diagnosed the problem. We have found two different board p/n's with the same type of defec
Electronics Forum | Wed Apr 28 06:26:15 EDT 2021 | jeremy_leaf
@Evtimov I can't use flux as the components being soldered can't cope with any contamination whatsoever. Even an ultra low solids no-clean flux will be too much. I also can't clean the boards after soldering due to any residual contamination from the
Electronics Forum | Wed Apr 14 19:47:13 EDT 2021 | solderingpro
Sounds like you may have already found the issue: inconsistency from your supplier. Seeing as Gold really doesnt oxidize and you're using an inert environment (N2 I suspect), I would turn my attention to the supplier. You said yourself, the "Shine
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 | Thu Nov 16 23:05:40 EST 2017 | slah6678
What is the IPC Spec for Golden Ground Pad Contamination with Solder ? Especially for Automotive product.
Electronics Forum | Fri Nov 17 11:03:32 EST 2017 | davef
IPC-A-610F, 10.1, Non-Soldered Contact Areas: Has words to the effect that for Class 1, 2, 3; it is defect to have solder or any other contamination in the critical contact area.
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
Electronics Forum | Mon Jul 28 11:22:46 EDT 2008 | blnorman
Iagree with Matt, normally caused by pad surface contamination. Out of curiosity, what is the PCB metallization?
Electronics Forum | Wed Jul 08 02:50:30 EDT 2020 | rsatmech
Hi DucHoang, Thanks for the response. I will share the images. We are using OSP boards and issue is not at particular BGA. Can you suggest me any methods to identify the pad contamination.
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.
winsouce.jpg)
.gif)
