Electronics Forum | Thu Sep 02 11:50:58 EDT 1999 | ScottM
| Could someone shares their experience on the causes of 'Open' in the BGA after reflow. | | Insufficient solderpaste. "No flux" (sat too long after print). Those are what I've experienced. Cheers, Scott
Electronics Forum | Mon Jul 20 02:35:42 EDT 1998 | Asher Levy
Looking for recommendation, need your on hand experience to decide on narrowing stencil opening relatively to actual pad on pcb for 0603 and 0402 components also info on stencil thickness ? (I have a very dense board with 0603 and 0402 comp.) Thx
Electronics Forum | Thu Jan 22 20:10:19 EST 1998 | Raymond
I have the following questions with regards to the solder printing stencil design : 1) Is the Electro-polish process recommended for laser cut stencil ? 2) Should the aperture walls be slanted at an angle or straight wall, i.e. trapezoidal openin
Electronics Forum | Wed Oct 03 17:52:37 EDT 2001 | mparker
I hate it when that happens. Usually I just buy a better brand of papers. Zig Zag works best. Of course, you gotta remove the stems and seeds, those are the most recurring sources that cause an open joint.
Electronics Forum | Thu Oct 04 12:48:09 EDT 2001 | vance
Overwetting is also a root cause of open joints. I recommend eating 5 saltines in 1 minute for anyone experiencing overwetting.
Electronics Forum | Fri Nov 16 09:03:38 EST 2001 | davef
@#*&^%$#&^**@@!!! Just got into work. One of the rechargeable screwdrivers is missing again. That part of the job is shut down, 'til Wal-Mart opens. How do yall prevent these nice little units from "walking"? Oooo, it is open? Gotta go!!!
Electronics Forum | Mon Mar 10 02:54:22 EST 2003 | sankar
Dear All, Can you advice on how to use X-Ray system to identify the QFP/PLCC pin open application. Whether at all X-Ray can be used for the above application. If so, what will be the false rejection of the X-Ray system. Regards Sankara narayanan ME
Electronics Forum | Sun Aug 01 11:39:41 EDT 2004 | Andrew
I am seeing high rate of open joint at NexLev connector and also BGA warpage issue with 52 mm Hyper BGA.anyone has the same experience?
Electronics Forum | Wed Aug 04 10:09:24 EDT 2004 | davef
We assume your opens are on the corners. If so, you are screwed. Look here: http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=28669
Electronics Forum | Thu Sep 16 15:01:13 EDT 2004 | russ
You may want to either open up the bottom of the vias so they will not "volcano". Or you will want to seal both sides. It never works having one side of the vias masked and the other open with HASL. Russ
