Electronics Forum | Fri Oct 07 17:22:16 EDT 2011 | davef
Questions are: * Pressure? * Heating ramp? * Solder alloy? * Solder preform or paste reflow? [We have more, depending on your answer] * 0.5 mm is pretty tight. Talk about tooling holes and measures to prevent flexing of the assembly * In time, heat a
Electronics Forum | Wed Jul 04 12:18:14 EDT 2012 | davef
Phil is correct in his description of proper rework technique. Possible explanations of the reason for popping of your BGA are: * Thermal cycling of components cause them to flex on a different point in the cycle that the board possibly resulting in
Electronics Forum | Fri Jan 31 10:04:14 EST 2020 | emeto
Jinesh, My initial suggestion is you have too much solder past. Please try to reflow a few of these parts without solder paste. Colse aperture, put some tacky flux on this part location and give it a try. I bet you will not see any voiding.
Electronics Forum | Thu Dec 23 12:31:37 EST 2021 | proceng1
I just learned of this and can only find a very small amount of information, and only from one source. I'd like to understand more. Also, they only seem to talk about low temperature PCB like flex. Does it work on FR4?
Electronics Forum | Mon Jul 01 16:00:43 EDT 2024 | cyber_wolf
"When I need more heat for larger thermal mass, I no longer have to worry about balancing slower belt speed with higher temperature." Robin, so you have a method to use the same heater set points and belt speeds used on a .018" flex board and for 1/
Electronics Forum | Mon Mar 01 22:37:01 EST 1999 | Dave F
| Hello! SMT professionals, | | I do not know if anyone posted this question before. | Last week, I reflowed our newly designed thin Rigid-Flex pcb with 0.040" thickness. I found all of pins of a TQFP48 ic did not get wetted. I could see on the hee
Electronics Forum | Thu Jul 27 12:30:37 EDT 2006 | Rob
Hi David, we used the following techniques in high volume production, depending on the type of flexi-board: (all were in milled pockets in a durastone pallet) 1) Kapton tape top & bottom 2) Spray mount & samll amount of kapton tape (you only had
Electronics Forum | Tue Aug 13 20:57:01 EDT 2002 | davef
We don�t use this glue. What does Heraeus say about your condensate? [I'm With the previous poster. Your condensate sounds like goop from NC flux not glue.] How to clean out a 3 meter length of chimney? Depends on your tolerance for pain * Take
Electronics Forum | Thu Oct 26 13:56:08 EDT 2000 | ptvianc
Hello: Pre-baking laminates should only be performed:(1) to meet contractual agreements or (2) in response to an actual defect that can be traced to PWB water absortion. Besides the fact that a pre-bake is an enormous process "bottleneck," it also
Electronics Forum | Fri Nov 16 03:23:15 EST 2007 | jwsmt
I'm requesting assistance in developing detection and containment methods for an issue with an SMD ceramic resonator (Murata CSTCE-G-A family). The returns have external visual cracks that originate at the termination and run at approximately a 45 d
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