Electronics Forum | Tue Mar 09 19:40:55 EST 2004 | Vijay
The shorts happen at corner of the BGA. The PCB thickness is 1.6mm, It is a PC motherboard with all thru hole connectors mounted on.The preheating is done using IR heater and the temp is 120-160 for about 70-80 sec.I am using ERSA IR550A
Electronics Forum | Sat Mar 15 01:03:10 EDT 2008 | callckq
All, What if BGA solder crack do exist after the shock test? Its happen at the corner of the BGA. Base on your experience, what are the potential root causes? Thanks, Sean
Electronics Forum | Fri Aug 22 14:38:21 EDT 2003 | russ
Please search the archives, there is a ton of stuff on this. Russ
Electronics Forum | Fri Jun 23 08:52:16 EDT 2000 | Dave F
John: Seek your answers in the archives. As I recall someone said: � Biggest cause of BGA shorting was out-gassing in-package moisture. � Removing shorts w/o removing the device: - Preheat the board - Lower the nozzle and heat the device - Lift the
Electronics Forum | Fri Jun 23 10:01:35 EDT 2000 | Bob Willis
A couple of weeks back I produced a video clip for Metcal to show what happens when BGA pop or the edge of the base warps causing shorts to form. Its 2.3meg if there is enough interest in seeing this I will put it up some where for download. Bob Wil
Electronics Forum | Tue Apr 24 12:05:56 EDT 2001 | pteerink
Robert, Were your parts in a sealed bag before use or were they exposed to the environment? If the parts have absorbed moisture, you might be seeing "popcorning" Phil
Electronics Forum | Thu Apr 26 09:29:43 EDT 2001 | Phil Bourgelais
Are you also getting shorts further into the package? Or is the failure simply the appearance of the package? If you send me the profile, I'd be happy to offer some suggestions. I have seen something similar. pbourgelais@us.vitronics-soltec.com
Electronics Forum | Thu May 17 22:57:43 EDT 2001 | davef
It is amusing. Tell us about the profile, how you shot the vid, was the component "bug up" or "bug down", causes of the bridging, etc
Electronics Forum | Mon Sep 29 08:24:26 EDT 2003 | davef
Look here: http://www.smtnet.com//forums/index.cfm?fuseaction=view_thread&CFApp=1&Thread_ID=6405&#Message25582
Electronics Forum | Mon Sep 29 16:14:34 EDT 2003 | mantis
DaveF, Thanks for the link very helpful and informative. I have got in contact with our part vendor on recomendations. Regards, Mantis
