Electronics Forum | Sun Dec 11 22:39:36 EST 2016 | ppcbs
We have been using the Amtech line for over 12 years now with all of our PCB and BGA Rework. The NWS-4400 is mildly active and will give better results with Lead Free Solder. Note that the LF-4300 is considered a No-Clean. However it will show lea
Electronics Forum | Thu May 30 10:31:03 EDT 2002 | robbied
Hi Yannick. This is an issue that we are just recently getting into but here is some ifo that I have gathered so far. I have seen/ used 2 different rework machines. The one we have bought is a 'PACE TF2000' which was at the lower cost end of the mar
Electronics Forum | Fri Apr 26 05:50:54 EDT 2019 | ppcbs
We just apply tacky flux to the surrounding components and to the bottom side components under the BGA. This will prevent cold solder if any solder joints reach reflow temperature the surface tension will keep them aligned and in place. If you nee
Electronics Forum | Fri Jan 13 11:57:51 EST 2006 | james
I am reworking some BGAs and just trying to find the easiest way to do it. Can you use tacky flux without solder on the pads to reflow? or do you have to have solder on the pads before placing the BGA to reflow? Any info is appreciated. thanks
Electronics Forum | Tue Jan 17 21:31:48 EST 2006 | KEN
Agreed. Some research sugests the "flexibility" of the joint(s) is reduced with flux only resulting in premature failure as compared to standard paste + ball reflow processes. However, this does not mean it is not a reliable method. Relibility req
Electronics Forum | Tue Nov 04 04:00:38 EST 2008 | Martin
Hi All, Anybody knows good, repetable method of dispensing flux for micro BGA rework? 6x6 mm(0.5 mm pitch) The flux dispensing amount by brush may vary depending on operator etc. If operator dispense too much flux the BGA "swim".Around the BGA compon
Electronics Forum | Tue Jan 17 08:12:44 EST 2006 | DannyJ
Dave, I would also like to thank you for the links. As well, I was not aware of this phenomenon. Excellent reads! Dan
Electronics Forum | Mon Sep 24 20:38:27 EDT 2001 | davef
Mike's comments are well taken. Your technique works fine with BGA, but uBGA are less forgiving. Again, let's take about: * Specifics of the problem. * Amount and method of applying flux. * What's holding the uBGA in-place before the solder ball an
Electronics Forum | Sat Jan 21 16:36:19 EST 2006 | gipos
Hi James, You can use the same flux for micro BGAs.The 529D we used for rework of high freq. CSPs and even w/out cleaning it still worked on 2.5GHz.We have not washed the flux for 6 months and the RF features of the circuits remain the same. No chan
Electronics Forum | Tue Sep 25 09:57:40 EDT 2001 | nwyatt
In regards to your last question, - problem is failures and most think it is due to too much flux - we apply flux with a brush - amount applied depends on the operator applying it - the flux is very thick and will hold the part in place before reflo
