Electronics Forum | Fri Apr 12 15:15:12 EDT 2002 | jsherrow
Water trapped under the PLCC (in the socket)during the wash was our reason for installing at final assembly.
Electronics Forum | Fri May 16 09:37:43 EDT 2003 | russ
Could we be seeing trapped water or flux underneath the BGAs? Russ
Electronics Forum | Wed Jan 05 12:48:44 EST 2000 | Dave F
Millerin: You are generally correct about plugging and over plating vias, but in Michaels case, the via is blind. Plugging would trap air between the bottom of the via and the plug material, causing an air pocket. When heated to soldering temperat
Electronics Forum | Fri Jan 21 19:30:11 EST 2005 | Dreamsniper
Hi T2, The purpose of this is that we want to make our rework robust. Whenever we rework BGA's we have solder getting trapped into those 1 sided tented vias and bet yah...they are hard to desolder! And during BGA resoldering these trapped solder will
Electronics Forum | Fri Jun 01 16:13:45 EDT 2012 | kahrpr
You also need to get with the PCB manufacturer. Their is a lot that can go wrong with that many layers. If the manufacture is trapping that much moisture. you may have a hard time baking it out. Dave and Graham are right about the time and energy. It
Electronics Forum | Thu Jan 06 06:15:49 EST 2005 | mattkehoe
We need some opinions about a situation that is causing problems in our process. The pcb's in question are .125 thick with a HASL finish. The boards are coming in with a large amount of solder trapped inside the via holes. Sometimes this solder is ac
Electronics Forum | Wed Aug 24 08:50:59 EDT 2005 | davef
First, while black pad can be a problem with poorly controlled electroless gold [search SMTnet Archives for background], it is not a suffiecient reason to use electrolytic. It's the reason the supplier should fix their electroless gold process. Se
Electronics Forum | Tue May 02 13:07:55 EDT 2006 | Jbrower
Howdy all. The question that I have is on wave solder pallets. I'm getting quite a bit of flux trapped on the pcb where it contacts the wave solder pallet. I have an appropriate profile for my assemblies, The flux that i use is Kester 920-CXF No Cl
Electronics Forum | Tue May 04 12:43:55 EDT 2010 | rgduval
Good point on the shop air. Shop air can also generate a tremendous amount of ESD. There are special nozzles you can get to minimize it. We use our shop air mostly for blowing out connectors, and larger components that have a history of trapping w
Electronics Forum | Sun Nov 28 20:30:51 EST 1999 | Greg H
What are the possible consequences when there's a flux entrapment (location: vias under components)under components during wave soldering? thanks
