Electronics Forum | Sat Apr 21 12:06:43 EDT 2007 | Cmiller
I coated three other bare boards on one side this morning from two different suppliers. Two of them had exceptional adhesion and one was so-so. I ran them through the reflow oven, coated them and got the same results on the other side, so it does not
Electronics Forum | Mon Apr 23 11:10:14 EDT 2007 | Cmiller
It appears that the two different boards we are having issues with are the only imersion silver boards that we process. Anyone have simililar issues with imersion silver? Is Dave F. on vacation? I would be willing to consider input from moon man at
Electronics Forum | Fri May 23 23:47:46 EDT 2008 | dint46
Wayne; Several things. 1.check the vendors and see what black oxide they are using are they the same ? It might be that. 2.You should bake your pcbs before the thermal stress is applied. To remove moisture. At your shop. The proce
Electronics Forum | Mon Apr 23 16:34:41 EDT 2007 | davef
Well then, maybe it's an incompatibilty between the soldermask and the coating, possibly due to undercuring of the soldermask. Thoughts are: * Some suppliers provide their thoughts on the compatibility of their product with other suppliers. For ins
Electronics Forum | Mon Apr 25 02:25:32 EDT 2005 | Mike Konrad
The issue of using ultrasonic technology for post reflow de-fluxing presents challenges in two categories: Controversial: Although there are recent studies that indicate acceptance with ultrasonic technology on populated assemblies, there remains si
Electronics Forum | Thu Aug 06 12:58:35 EDT 1998 | Paul J. Lingane
Is there any problem using SMT on gold boards? 15 years ago we were told not to use gold boards, but I can't remember why. Judging by the other postings it now appears to be common. Only problem I see is that the nickel should be plated, not elect
Electronics Forum | Thu Apr 16 09:33:12 EDT 1998 | Philippe
Is there anybody to help me ? We have small balls appearing on the boards soldered by wave soldering machine and it looks that use of nitrogen is linked to the problem (because without nitrogen, we have no more problems). That remind you something ?
Electronics Forum | Fri May 23 15:33:39 EDT 2014 | hegemon
I don't see any visuals that make me think of black pad phenomena. I do note that it appears that pads on the BGA itself have detached and been left on top of some of the solder balls. To me it looks like the temperature profile is not correct, not
Electronics Forum | Sun Oct 09 08:28:04 EDT 2005 | davef
First, no one knows very much about the relaibility of Pb-free assemblies, much less Pb-free solder with Pb-bearing components. Second, we do know that Pb-free components work with PB-bearing solder. Third, based on comparison laboratory testing,
Electronics Forum | Thu Aug 06 13:09:37 EDT 1998 | Ben Salisbury
| Is there any problem using SMT on gold boards? 15 years ago we were told not to use gold boards, but I can't remember why. Judging by the other postings it now appears to be common. Only problem I see is that the nickel should be plated, not ele
