Electronics Forum | Mon Aug 22 06:30:59 EDT 2011 | janz
very often toes on the QFP packages are exposed to base material and during time they oxidize. That is why you can have problem with solder fillet. Most important is heel fillet. Regarding your misalignment of IC if this is repeatable check your pl
Electronics Forum | Sat Oct 07 16:31:56 EDT 2000 | Elfego
Tray the electroform stencil.
Electronics Forum | Mon Aug 29 12:11:09 EDT 2005 | Kris
what is the plating on the component ? Lead free ?
Electronics Forum | Mon Sep 29 09:31:18 EDT 2008 | davef
No fixture needed. Look here: * http://curiousinventor.com/guides/Surface_Mount_Soldering/QFP * http://www.infidigm.net/articles/solder/ * http://video.google.com/videosearch?sourceid=navclient&ie=UTF-8&rls=GGLC,GGLC:1969-53,GGLC:en&q=soldering+qfp
Electronics Forum | Thu Aug 18 17:00:26 EDT 2005 | MM
We recently had some boards returned that have me stumped. Word was QFP pins were coming out of the solder in the field. Upon inspection it was true!! If you press gently on the pins they SLIDE out of the joint. The joints look good, shiny ect but it
Electronics Forum | Thu Aug 25 08:26:48 EDT 2005 | DannyJ
Hi MM, Off the cuff, is it possible that the QFP leads were not coated? I'm by no means an expert in QFP manufacturing, but I do believe that there is a coating which enables solderability that is added to the leads somewhere in the process. I ha
Electronics Forum | Wed Oct 01 10:59:13 EDT 2008 | realchunks
Wouldn't it be cheaper to by quality parts? Most repair operators can solder a QFP 208 with a regular soldering iron, eyes closed and hands behind their back. If you are just touching up the leads because of co-planer leads, a regular iron is all
Electronics Forum | Thu Aug 25 08:54:24 EDT 2005 | stepheniii
Could it be cold solder? Are there parts nearby that might be soaking up lots of heat, or maybe lots of internal grounding near that corner? Once I saw something similar except it was on two different assemblies. Each time it was on the side of the
Electronics Forum | Tue May 29 10:08:17 EDT 2007 | aj
Hi Dave, The customer is supplying a new batch as this batch just doesnt want to solder. aj...
Electronics Forum | Mon Aug 29 10:18:14 EDT 2005 | Just a Viewer
Hi, Wanna to know if you have extra boad (Solder Sample) and extra parts to waste ??? If so, place the parts in all different angle on your solder sample boards... see what going to happens ???
.jpg)
