Electronics Forum | Wed Dec 14 09:03:28 EST 2005 | russ
See "black pad" and determine if that's what you have.
Electronics Forum | Wed Jun 14 05:20:00 EDT 2006 | YQ DENG
How to check incoming bare PCB black pad phenomenon?
Electronics Forum | Mon Nov 26 10:36:19 EST 2007 | davef
Sure, if you slopper or schmush chipbonder onto pads, solder will not take on that portion of the pad, regardless of the component.
Electronics Forum | Tue Apr 15 21:24:41 EDT 2008 | davef
We find it curious that: * Heat slug pad for Q19 didn't take solder, indicating a pad [board] solderability issue. * Signal termination pads for Q19 didn't flow well, indicating a poor thermal recipe or a pad [board] solderability issue. * Signal ter
Electronics Forum | Thu Jul 10 22:46:08 EDT 2008 | davef
We'd like to see pads on the board that closely resemble those on the interposer.
Electronics Forum | Thu Jun 26 08:20:42 EDT 2008 | cyber_wolf
Check your pad spacing on the board. Look at the IPC specs for pad design.
Electronics Forum | Tue Jul 01 13:35:49 EDT 2008 | realchunks
QFNs have pads on the bottom. LCCs have pads on the sides that are exposed on the bottom.
Electronics Forum | Mon Sep 08 20:55:04 EDT 2008 | davef
Of the six pads in the picture, which are the two that are unacceptable?
Electronics Forum | Mon Oct 20 12:42:34 EDT 2008 | robinj
Any pictures of those pads prior to printing? Or how does the incoming boards look?
.gif)
