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 Dec 14 09:53:03 EST 2004 | paul_fisher
Yep fully functional and failed during the test. 25 to 55C in 3 hour hold for 9 hours then 55C to 25C in 3 hours hold for 9 hours then repeat. Humidity at 95 percent! Boards only part conformally coated. Growth with and without the coating. seems to
Electronics Forum | Thu Aug 17 12:38:57 EDT 2006 | finalassy
What type of water soluable flux are you running in you selective solder machines? I know that we had to replace the ruby that the solder shoots through at the top of the fluxer once because of crystalization. That was not a cheap replacement. Doe
Electronics Forum | Mon Nov 13 09:00:07 EST 2006 | pavel_murtishev
Good afternoon, 1. Never heard that phosphorus crystals formation creates difficulties with BGA soldering. Two points to check are reflow process and screen printing process. BGA package is designed to have extremely high yield. 2. Title: Reflow So
Electronics Forum | Tue Feb 02 09:31:20 EST 2010 | markhoch
I just realized that I should've been more specific. (My question was certainly open ended) I'm concerned with Wave Soldering a Metal Body, Two-Leaded Crystal Oscillator such as this: http://www.citizencrystal.com/images/pdf/m-hcm49.pdf Any thoughts
Electronics Forum | Wed Jul 22 11:29:02 EDT 2015 | thomassd
We have 3 crystals that visually look identical that are placed on the PCB. The issue our inspectors are having is validating the value is correct per reference location. There is no power ever applied to the board. Does anyone have any suggestions o
Electronics Forum | Wed Nov 28 16:19:11 EST 2018 | emeto
Hello all, I have a crystal that breaks in spinning test with several G. I need to secure this part and I am wondering what kind of solution you might have. I was thinking some silicone coating that can be dispensed.Or do you think an underfill migh
Electronics Forum | Mon Apr 05 16:12:16 EDT 2010 | dyoungquist
We are installing via reflow soldering a crystal that has 2 pads, 1 each end. They are flat pads on the bottom of the part with a small area of the pad looping around and up the side of the crystal on the end. Inspection of the cyrstal under a 40X
Electronics Forum | Fri Apr 23 16:36:27 EDT 2004 | davef
Comments. Comments. Hell yeh, we got comments!!! You are correct to question the appearance of this solder connection. Based on your description, it's defective. Well at best, it's VERY suspect. That's the rule. If it's suspect, question it.
Electronics Forum | Mon Dec 13 18:17:44 EST 1999 | Calvin Wong
We have this solder ball & beads around chip components since day one of manufacturing using non-clean process. We managed to eliminate the solder beads around ceramic type chip componenets when we have a slow ramp up of pre heat at solder reflow. Ho
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