Electronics Forum | Thu Jun 23 11:56:51 EDT 2005 | wjxingggg
Hi, all. There is one 0.8mmX0.8mm QFN on almost of our PWBAs. But the quality report showed that we got bad solder quality for this component. My question is which elements are the root cause for this situation frequently? Thanks.
Electronics Forum | Fri Aug 07 01:02:51 EDT 1998 | zeek - just wanna to get a word in here
| | I am looking for advice or information from anyone about the possible reliability problems associated with epoxy on solder pads of discrete devices. Will the epoxy expand and lift over time, Will there be adverse reaction between the solder and t
Electronics Forum | Sat May 09 23:05:17 EDT 2009 | kareal
Davef, It seems the tin resist residue on copper trace is root cause of whitish layer. but it could explian why I could not detect tin on fresh unit without UHAST. I have performed X-section and EDS analysis on many fresh units,but no any tin was
Electronics Forum | Mon Feb 12 10:02:18 EST 2007 | rgduval
A little late to the party here, sorry... Has the joint been verified as a cold solder joint? That is, visually confirmed that it looks like cold solder, and, perhaps, xrayed to confirm the solder status? X-raying may sound a bit extreme, but you'
Electronics Forum | Mon Sep 17 02:56:40 EDT 2001 | mugen
Hi, (me been absent for some time...) Are your brds confirmed HAL over copper? (check out what Dave F mentioned abt possible root causes) or are the brds HAL over nickle? (shd be no problem here, if so?) or are the brds strictly nickle plated pads?
Electronics Forum | Fri Aug 29 09:39:08 EDT 2014 | rgduval
I'll try to deal with the issues as you've presented them. 1. Blistering/delamination, shown in photo 2. The most likely cause of blistering/delamination like this is moisture in the boards. The moisture can get into the boards in multiple ways..
Electronics Forum | Tue Apr 23 10:31:59 EDT 2019 | laserpro
Hi all and thanks for viewing my post! My questions related to the subject line are as follows: 1. Does the Epoxy Solder Mask Layer of a PCB protect against moisture absorption? Is this a primary function of the solder mask? 2. Does exposed FR4 na
Electronics Forum | Thu Aug 28 23:15:44 EDT 2014 | phyllishwl
Hi all, Our production reported that they found 3 panels out of 53 panels with strange phenomenon after reflow. 1/ Blister / Delamination of PCB panels, 2pcs blister/delamination under solder mask, 1pc under Gold plating at Gold finger 2/ Silkscr
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?
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