Electronics Forum | Fri Jul 23 14:41:41 EDT 2004 | Steve Stach
Dear JSK, It sounds like the root causes of your problem are two fold. First, excessive heat will polymerize the abietic acid found in rosin forming neo-abietic diamers and polymers which are much less soluble than the parent monomer. There are
Electronics Forum | Wed Apr 25 10:53:49 EDT 2001 | wbu
Zam_bri: If it were a mystery .... there can�t be any answers . Possible causes: - Short is in the PCB ( not very propable, cause you�ve checked that ) - Short is in the BGA ( not very propable, cause you�ve checked that ) - Short occurs due to so
Electronics Forum | Wed Apr 25 09:12:52 EDT 2001 | zam_bri
Hi, Can anyone advise what would be the possible cause of having the same short problem at the same spot even after 3 time rework, with a brandnew BGA. I have rework boards with BGA shorts. The problem is most of the shorts boards, will passed afte
Electronics Forum | Fri Sep 24 10:57:18 EDT 1999 | Earl Moon
| Hi Folks: | | We've been having bridging problems on our fine-pitch QFP's, despite thorough inspection of paste height, volume, and placement accuracies....profiles look good also. | | The bridging is happening after coming out of reflow...one la
Electronics Forum | Wed Aug 10 17:19:24 EDT 2005 | Steve Stach
The propensity for flux residues to cause shorts can be increased in humid environments where water molecules hydrate the surfaces. At high frequencies, electrons travel on the surface of conductors/insulators, increasing the likelihood of shorts in
Electronics Forum | Sat Mar 20 00:58:10 EST 1999 | Mike C
| After rmoving a BGA (plastic)to correct unexplained shorts | I installed another BGA using flux only. | Checking on an X Ray machine and found two shorts. | | can anyone give a good explenation ? | | Thanks | | Ron | Another possibility Via's n
Electronics Forum | Fri Aug 20 17:17:14 EDT 1999 | K.T
| | | | Yesterday as I was creating a profile on a plastic BGA using Conceptronics freedom 2000 rework station, I happend to discover that I was able to remove solder bridging from a plastic BGA. | | | | | | | | This is what I did. | | | | | | | |
Electronics Forum | Fri Aug 20 14:51:47 EDT 1999 | Tony
| | | Yesterday as I was creating a profile on a plastic BGA using Conceptronics freedom 2000 rework station, I happend to discover that I was able to remove solder bridging from a plastic BGA. | | | | | | This is what I did. | | | | | | Created a
Electronics Forum | Fri Aug 20 14:51:55 EDT 1999 | Tony
| | | Yesterday as I was creating a profile on a plastic BGA using Conceptronics freedom 2000 rework station, I happend to discover that I was able to remove solder bridging from a plastic BGA. | | | | | | This is what I did. | | | | | | Created a
Electronics Forum | Mon Mar 15 08:06:46 EST 1999 | Ron Lahat
After rmoving a BGA (plastic)to correct unexplained shorts I installed another BGA using flux only. Checking on an X Ray machine and found two shorts. can anyone give a good explenation ? Thanks Ron
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