Electronics Forum | Fri Apr 21 09:03:59 EDT 2006 | choppy
I guess the first thing to look at is the temperature. We had to heat more for QFP256 on sample boards and we saw discoloration on some small parts. Just try to sense around when profiling to see what's there.
Electronics Forum | Sat Aug 15 06:29:40 EDT 2009 | abeasia
Help, experiencing discolor of a white solder resist paint after reflow of 250 degree, it turned yellow. Have tried many paints, no luck. Anyone knows one that wouldn't change color and holds the white nicely? Thanks for your support in advance.
Electronics Forum | Mon Dec 30 10:22:58 EST 2013 | davef
A-610E, 10.7.4 covers solder mask discoloration. Use that for your disposition
Electronics Forum | Thu Dec 26 08:40:21 EST 2013 | vileo72
Hi , During one of NPI trial ,we found that boards ( CEM -1 grade )has got discolored on the masking portion ( and not on the conductors) after reflow .Although it does not impact our Form /Fit and Function characteristics , I would like to get your
Electronics Forum | Thu Jul 06 20:10:06 EDT 2000 | Dave F
I agree. Make them quit doing this ugly thing to your boards!!!
Electronics Forum | Mon Oct 20 14:17:35 EDT 2008 | robinj
The discoloration/shadow appearance is a clear sign of black pad which is from nickel corrosion in the gold bath.
Electronics Forum | Wed Sep 09 12:20:28 EDT 2009 | richardli
What is the cause of this discoloarion? Soldermask masterial wrong? Thanks.
Electronics Forum | Fri Apr 16 11:51:26 EDT 2010 | shawnvike
Looks like a simple variance in the solder mask discoloring. Shawn
Electronics Forum | Mon Dec 30 23:51:13 EST 2013 | vileo72
Hi Dave , Thanks and will align accordingly .
Electronics Forum | Wed Apr 10 17:05:47 EDT 2019 | davef
I wonder if this discoloration isn't delamination. I'd discuss it with my board fabricator.
