Electronics Forum | Wed Feb 07 16:14:54 EST 2001 | Antonio
I've recently read a posting here which said that the person was trying to reduce solder balls. One of the things the person had done was to adjust the reflow profile so as to be hotter and longer in the reflow state. Am I wrong here? I thought th
Electronics Forum | Wed Feb 21 21:21:05 EST 2001 | Dave E
Realistically it seems like a component problem that the vendor is trying to blame on our processes. The problem is internal to the 0805 resistors so I suppose they are perhaps porous to some degree. I have only heard 3rd hand about the analysis that
Electronics Forum | Fri Mar 02 11:13:50 EST 2001 | fkurisu
Hello Mark, To date all solder mask rework we have done has been on the PCB board. I believe that it possible to reapply solder mask on to the ball side of the BGA. Would it possible to evaluate some of your BGA's? You can contact me at 714 842
Electronics Forum | Thu Mar 08 22:24:45 EST 2001 | davef
Sounds like you've done a good job of troubleshooting. Two thoughts are: 1 An alternative to using a hotter flux that the others mentioned is to use components with more solderable terminations. [A firm grasp on the obvious.] 2 You spoke about
Electronics Forum | Tue Mar 20 09:03:18 EST 2001 | moseschee
Hi, I'm looking for research/study done on solder shelf life by using accelerated aging process ( steam age or dry air oven bake at 150C & etc ) Perhaps you could help to advise correlation of all this acceleration test to actual solder shelf life
Electronics Forum | Tue Apr 17 19:35:55 EDT 2001 | Brian W.
I have only found one reason to clean the residue. On some high power/high impedance or RF circuitry, that little bit of residue caused electrical performance problems. Other than that, most people who want it cleaned are having it done for vis
Electronics Forum | Thu Jul 20 13:23:30 EDT 2000 | Ross Clunie
Bob We are just starting to look in to this process and have been told that it can't be done using a stencil to print the solder paste onto the PCB (of course it was by an equipment manufacturer trying to sell a paste dispnecer). Is this a far commen
Electronics Forum | Thu Jul 20 12:38:55 EDT 2000 | Bob Willis
The first time I was faced with this it was on a night shift training M ?????????? and we used a standard hot air rework system with no under board heating. The trick is to keep the air flow low and you can remove the parts. Most people use too highe
Electronics Forum | Tue Jun 05 22:18:47 EDT 2001 | Dreamsniper
I don't understand why you wanna do this. The vendor has done this part for you and actually they have a recommended glue / solder paste life on the stencil or pcb (e.g. 6 hrs, 8 hrs.). If you will stick with their recommendations you won't be lost p
Electronics Forum | Tue Jun 26 07:40:18 EDT 2001 | caldon
Try this link out. http://www.airliquide.com/us/ep&a/TechPapers.htm Air Liquide has done many studies on this topic. There should be some useful information there. Cal Caldon W. Driscoll ACI USA 610-362-1200 cdriscoll@aciusa.org
