Electronics Forum | Fri Aug 16 09:59:49 EDT 2002 | dason_c
We baked the board first and print 2 mil water soluble paste at the BGA location and reflow. Wash and baked before the production run.
Electronics Forum | Thu Oct 05 13:33:28 EDT 2017 | duchoang
We did some tests with good result. No failure physically and functionally. Is there report/study/documents about this procedure so we can convince customer to approve our process using ultrasonic wash. Thank you, Dave
Electronics Forum | Thu Oct 05 12:10:36 EDT 2017 | duchoang
Thank you for your replies. We use No-Clean Paste and some customers do not want any residue left around solder joint even so, so little. They want the residue washed completely. If we use water-soluble flux, we still need to wash, anyway. Their conc
Electronics Forum | Wed Aug 04 16:46:40 EDT 2004 | davef
We assume this is different discussion that the discussion about "crystallized flux under BGA". Correct? Milky residue with water washing makes us think "noclean flux res that just got washed". We know what you said, but we can't help ourselves.
Electronics Forum | Tue Mar 30 22:30:06 EST 2004 | davef
Tony First, drying at 125*C for an hour is not going to do much drying. Heck, those boards are barely warm to the touch. Second, tell us about: * Pitch of your uBGA * Solder paste flux * Cleaning process and agents
Electronics Forum | Mon Apr 12 11:43:11 EDT 2004 | wgaffubar
Your wash unit should dry the boards well enough for you just take them and run them second pass within minutes of exiting the wash unit. We did it for years with no problem at all. If you must the hour at 125 will dry the wash water more than enough
Electronics Forum | Thu Oct 05 12:50:48 EDT 2017 | davef
Why not toss a handful of the component that you're concerned about into your cleaner, clean them according to your board spec and the evaluate what happened?
Electronics Forum | Thu Oct 05 07:11:35 EDT 2017 | emeto
Now you are putting your assembly to vibrate with frequency of 30-60kHz. What kind of flux/paste are you using? If it is NC there is no reason to clean. If it is water wash, you should consider a proper way of cleaning it according to your paste/flux
Electronics Forum | Tue Apr 13 17:48:54 EDT 2004 | davef
Q1: Can anyone explain to me about the effect of their mixture. A1: What is their �mixture�? Q2: What enhancement does my BGA will have when using a WS paste flux with regards to corrosion, 25 years life cycle of the solder joint. A2: Tough to say
Electronics Forum | Thu May 22 09:06:05 EDT 2008 | davef
While you're waiting for others to reply, consider this posting from the fine SMTnet Archives - http://www.smtnet.com/forums/Index.cfm?CFApp=1&Message_ID=17279
