Electronics Forum | Mon Jan 18 14:01:47 EST 2010 | cl
Good Afternoon, Is this by chance a Pb BGA on a RoHS board? We had an issue with a Pb BGA on a RoHS board where we experienced "ball drop" on the Pb BGA. This was due to the heat required to reflow the RoHS paste. It was more than the Pb BGA could
Electronics Forum | Tue Jan 19 09:45:06 EST 2010 | pcbrookie
You nailed it. After some further investigation, it appears we had some old Pb version of this part that never got scrapped. Corrective action has been taken, and all the Pb parts have been disposed of. It makes sense that this would happen to the
Electronics Forum | Mon Aug 30 14:32:52 EDT 2010 | davef
Steve: Yes, you shall bake prior to thermal cycling. You should be able to download J-033 from JEDEC [ http://www.jedec.org/standards-documents ]. You want "Paragraph 4 Drying." While it's aimed a component parts and not assemblies, J-033 is as goo
Electronics Forum | Mon May 23 09:28:26 EDT 2011 | alcatel
I need to stack 2 resistors size 2010 on one location. Ive heard that there is a chip like solder solid which could be placed on the solder pad connecting both chips with its height, but never got much detail about this. cant afford to be doing thi
Electronics Forum | Thu Feb 11 08:14:41 EST 2010 | scottp
It's OK to have the daisychain done in the interposer rather than the die (and a lot cheaper) but in thermal cycling the parts MUST have representative die. That's where a large part of the CTE mismatch comes from to cause fatigue damage. Thermal c
Electronics Forum | Wed Apr 14 10:24:17 EDT 2010 | fönsi
Hello Does somebody of you have some experiences with ultrasonic detectors in SMT-Production? Is it possible to test quality of solder joints by using a ultrasonic detector similar to non destrucitve crack inspection tests? Is there a manufacturer fo
Electronics Forum | Tue Jun 22 00:20:21 EDT 2010 | leadthree
Pick & Place > Wave-solder > other parts > test > conformal coating Is there any production error that could make a ceramic cap conductive? PS: want to add one point: The caps don't seem to be cracked. We changed a few 100 and didn't notice any bro
Electronics Forum | Fri Jul 04 21:09:04 EDT 2003 | ramanandkini
I have a CEM-1 PCB board with 35 microns copper. This is PCB is finished with SMOBC+HALS. We do solder SMT LEDs, but till date we do not have problems that you have listed. The LEDs are good & bright. It even passed high & low temp cycle tests (-40 t
Electronics Forum | Thu Sep 11 15:23:31 EDT 2003 | Peter L.
I have come across a rash of failed assemblies that have 0805 capacitors and resistors, bottom side glued, wave soldered and washed. Trouble shooter reported touching up the solder joints on a few areas and the boards would pass test. I had a look a
Electronics Forum | Mon Aug 30 11:09:13 EDT 2010 | davef
Lots of small parts, lots of hand soldering, lots of tired eyes inspecting on lots of boards: yields lots of room for error. How about this: * Part removal ** Cut each resistor between the pads using dykes ** Using a soldering iron [or hot air pen],
