Electronics Forum | Wed May 20 17:18:09 EDT 2009 | daxman
Just out of curiosity, how are you or anyone else determining a defect? Last I checked, IPC had no criteria yet for solder defects for QFN components. Has this changed? Biggest problems we see are voids which our x-ray shows a lot of. Our problems
Electronics Forum | Thu Jul 17 15:12:18 EDT 2008 | slthomas
To quote a regular here, "Are you sure your washer is set up correctly?" :P He's a WS junkie. This is a really common problem and is discussed here often. Mid chip solder balls (solder beads) are almost always the result of too much paste being dep
Electronics Forum | Thu Apr 29 04:34:07 EDT 2004 | allsmt
Dear Sir's, we had become an inquiry from an customer of allSMT, who is in need of an Machine which can solder via Laser? does anybody has experience with this procedure? I will try to explain the project. The pcb is an Aluminium pcb. There must
Electronics Forum | Thu Sep 29 19:18:24 EDT 2005 | HLy
Hi, I noticed that the solder joints on my BGAs end up with a lot of wrinkles after reflow. See picture at: http://pstr-r02.ygpweb.aol.com/data/pictures/02/01A/17/DD/E3/9E/n8BhepQLFDs6GMSwaRNxPCTWR5NdpUJZ0300.jpg Does anybody have any ideas what cau
Electronics Forum | Wed Jul 19 21:11:40 EDT 2006 | ec
Hi Dave, Sorry that I did not explain clear enough. What I mean normally after reflow, the solder joint is very smooth and there is wetting. But now we see there is hole on the solder surface and is not on the same loaction. This product have been r
Electronics Forum | Sat Dec 04 09:23:20 EST 1999 | Christopher Lampron
Kantesh, Does this particular part have a heat sink across the bottom side of the component and does your pad size and stencil aperture match the component? I have just had a very similar problem with a DPAK. What we found was that the recomended pad
Electronics Forum | Wed Feb 21 22:08:23 EST 2001 | Dave E
Well, the vendor claims the contaminant caused the component failures. So? The only feasible possibilities would be contaminated solder paste, wash water or coating -- or maybe the problem is due to defective resistors?
Electronics Forum | Wed Apr 26 10:27:37 EDT 2006 | slaine
weve hand soldered a few components that were tarnished with no problems, also the tarnish is electrically conductive if it helps.
Electronics Forum | Tue May 23 09:01:48 EDT 2006 | russ
Seems as though the problem is with PCB and not component? "Solder does not wet to pads, wets to component" What is your board finish? Russ
Electronics Forum | Mon Nov 12 01:18:29 EST 2007 | sin4d
Hi, ALL I experience some QFP with wetting issue on the heel of the lead. There is no fillet wetting on the heel which causes reject bt the customer, but not all the QFP. Could anyone pls help what is the causes of this problem, it is due to oxidati
