Electronics Forum | Mon Mar 29 07:21:51 EST 2004 | jdumont
We are also having the same problem here. I was told earlier that it could be a problem with the solder mask during the raw board manufacturing level but then I noticed that the problem was only surfacing on boards that went through the wave. As far
Electronics Forum | Tue Mar 30 02:58:55 EST 2004 | Grant Petty
Hi, Thanks for the ideas. With the solder mask curing problems, can you normally wipe off the white residue, as we can do this on our boards with our fingers. It's almost like the surface of the board has a "wet dried up" look to it, and it's a smok
Electronics Forum | Fri Jan 29 19:11:10 EST 2010 | kaz
We (Industrial Electronics Service Depot) have been using a dishwasher with success on dirty/contaminated boards but without BGAs. Now we have a CPU board with couple of BGAs on it and no experience/expertise.. Is the washing it and the compressed
Electronics Forum | Thu Jun 08 20:07:32 EDT 2023 | daniel_stanphill
The answer to this lies within the datasheets of the components on the board. Each component has its own specs as far as number of heat cycles, time at reflow, peak temperature, whether it can be washed, etc. You do not need to be as thorough on th
Electronics Forum | Mon Mar 29 14:58:08 EST 2004 | davef
Josh: Final cure of the LPI solder mask: 310*F for 45 minutes. Your board fabricator needs to do a better job. Most fabs do not check cure, because the processes subsequent to cure are so brutal that the fab expects the following process to highlig
Electronics Forum | Mon Oct 30 20:24:35 EST 2006 | davef
As we understand it, you: * Get some nice BGA from your supplier * Find BGA to be packaged properly * Bake the BGA for 24 hours at [what temperature?] to reduce the potntial for damaging moisture sensitive components during following processes * Remo
Electronics Forum | Fri Apr 02 01:05:34 EST 2004 | Grant Petty
Hi, Thanks for the info. How clean can wave soldering get? We are looking at a carrier that masks off most of the board when we run it through the wave, so hopefully this works. Regards, Grant Blackmagic Design
Electronics Forum | Mon Mar 29 11:20:04 EST 2004 | jdumont
Hi Dave, its not the connections that have the white residue. It is the surface of the board. The whole thing turns a milky white color. I have pictures if anyone would like to see them... Josh
Electronics Forum | Mon Mar 29 13:59:27 EST 2004 | jdumont
Well how can I correct this? Would baking the board prior to any operations help? Is this an issue I should get the PCB manufacturer involved with, or something that is common and just live with it?
Electronics Forum | Fri Apr 27 07:33:46 EDT 2007 | ccross
Thanks for the help. In looking at these now I have questions on the recommended impact pressures. Is there a certain pressure recommended for certain types of devices? Does IPC or anyone call out recommended pressures for circuit boards?
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