Electronics Forum | Fri Aug 16 10:00:03 EDT 2002 | davef
You have a very bad situation. It�s tough for the gas, flux material, er whatever to escape when the BGA is sitting on top of it and the blind via is blocking it from the other side. Obviously the vias should have been: * Placed on the edge of the
Electronics Forum | Fri Aug 20 19:01:26 EDT 2010 | varivenca
VARIVEN,C.A, is a newly emerging company in the electronics field. Variven was established in 2009 to take care of design, repair and maintainance of pcb cards and electronic machinery for oil companies. As of now we are creating basic boards for o
Electronics Forum | Thu Feb 27 16:23:37 EST 2020 | dwl
http://www.circuitnet.com/news/uploads/3/Comparing-Soldering-Results-of-ENIG-and-EPIG-Post-Steam-Exposure.pdf Years ago, I battled this problem. ENIG PCBs reflowed with active WS flux. We built one side, and then washed them because they were going
Electronics Forum | Thu Dec 12 17:39:14 EST 2019 | davef
When I hear "pinholes" in solder connections, I think of two sources, depending on the situation, which can be either: + Entrapped air and process chemicals develop during reflow soldering to cause the pinholes in and around the intermetallic layer
Electronics Forum | Tue May 28 18:31:08 EDT 2019 | jlawson
Solder paste flux is main contributor, Lead termination chemical-oxide by products and PCB Plating-Chemicals. Reflow profile would have very limited if not no impact really unless is way off. Paste volume control and Stencil design plays a big part
Electronics Forum | Sun Apr 11 14:35:25 EDT 2004 | davef
Please: * Describe the color and texture of the dry solder connection on the board. * Tell us the thickness of the gold and nickle plating on the board pads. * Inform us about the width and scope of the problem.
Electronics Forum | Thu Jul 05 19:39:19 EDT 2001 | davef
I had forgotten that it was you that was on the Sipad adventure. [But then again, who can keep track of yer aliases? ;-)] You just go from one adventure to the next. Expanding On Dave�s Hi-Test Flux Method Theory � PASTE: Yes, contact your favorit
Electronics Forum | Wed Jul 04 12:35:19 EDT 2001 | davef
I thought I responded this this a while ago, guess NOT!!! Wow, Dano yagot Entek boards that are that old!!!! Coo. Sounds kwazy that you�d end-up with that volume of old boards, but it�s probably one of those deals where correcting the problem keep
Electronics Forum | Tue Apr 23 15:36:27 EDT 2019 | davef
Josh, are you setting someone up with these questions? Answers to your questions related to the subject line follow: Q1. Does the Epoxy Solder Mask Layer of a PCB protect against moisture absorption? Is this a primary function of the solder mask?
Electronics Forum | Mon Jun 25 20:39:08 EDT 2001 | ianchan
Hi mate, no complete info given from what i see, so just some humble comments, mayhaps you review : 1) PCB pad finishing - Copper+nickle plated? coz if so, nickle is a KILLER to good solder wetting. what we did back here, was to HAL coat the nickle
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