Electronics Forum | Fri Aug 12 17:36:06 EDT 2011 | grics
Dave is correct. Also, you should check the TDS's of the caps and the display before processing to see if they can withstand the process temps, look for a recommended solder profile or info for the manufacturability of the device. On another note,
Electronics Forum | Sat Aug 13 10:56:57 EDT 2011 | jldowsey
Process Flow #4 in davef's response is your best bet for this assemblly judging buy your pictures. We purchase our selective wave solder pallets from Ascentec Engineering - they can fabricate a pallet to hold your assemblies, keep the SMT devices pro
Electronics Forum | Wed Sep 14 15:42:45 EDT 2011 | nowak18
During temperature cycling we have determined that the conformal coating wicking underneath our BGAs has caused fractures in our solder balls. One proposed solution is to run an RTV dam around the parameter of the BGA to prevent the CC from wicking u
Electronics Forum | Thu Sep 22 14:25:13 EDT 2011 | hegemon
Dave has stated the caveats well. I too have similar experience in reworking BGAs that mirrors your own. The only situation where I saw this as an issue, was in memory devices where a row of BGAs might share a commonm heatsink. In those cases the
Electronics Forum | Mon Sep 26 14:05:04 EDT 2011 | scottp
I agree that class III is overkill for most applications and the customer needs to pay for it if that's what they want. It's also true that class III doesn't assure things won't fail. Life expectancy is mostly due to component and material selectio
Electronics Forum | Tue Sep 27 09:43:38 EDT 2011 | dyoungquist
I did not mean to imply building to class III would prevent failures. Since there seemed to be a little confusion about the classes I threw that out to show that class III was a higher standard. I also agree that while re-work can fix a class III d
Electronics Forum | Thu Sep 29 17:42:49 EDT 2011 | action_101
I used Indium WF-9940 at the last place I was at for 5 years. We ran leaded and lead free product in our ERSAflow selective soldering machine with that flux type. It worked good for both applications. The place I am at now we have an Ersaflow selecti
Electronics Forum | Wed Sep 19 12:27:56 EDT 2012 | proceng1
Are you sure that you are getting adequate nitrogen flow up through the cap? If your pump isn't seated properly, you may have nitrogen escaping. Also, I have two different height nitrogen bases. The shorter one does not allow as much gas to escape
Electronics Forum | Tue Nov 01 09:16:03 EDT 2011 | austinpeterman
Hello, Looking for a solution to silicon conformal coating wicking up into connectors. We build IPC-A-610 class 2. We are using a PVA 650 with Dow Corning 1-2577 conformal coating. We have solder joints that must be coated 1.25mm from the connecto
Electronics Forum | Thu Nov 10 02:04:26 EST 2011 | julien
We've got the same problem here, what we do is to apply peelable solder mask around the connectors or the exclusion zone. But be carefull! Sometimes the soldermask get inside the connectors and you can't remove it so you have to change it. Another th
