Electronics Forum | Tue May 06 06:29:06 EDT 2003 | yukim
Hi, No, the layout is different, but both have chips located arallel and perpendicularly to the flow direction. And we do have defects in both orientation. What about the PCB warpage? Sometimes we find warped PCBs. Could this affect? Thanks, Yu.
Electronics Forum | Fri Sep 20 08:45:27 EDT 2019 | bukas
hello, I have been experiencing a strange solder defect lately. hope some of you may know what is causing it. it happens on same side of processor and there has been no changes in soldering process.
Electronics Forum | Sat May 03 00:58:51 EDT 2003 | ken
Did you check if the height of solder mask between two pads is higher than pads?
Electronics Forum | Sun May 04 22:10:20 EDT 2003 | Thomas
Did u ever try a anti-tombstone solder paste to try to eliminate this problem ??
Electronics Forum | Tue May 06 06:31:21 EDT 2003 | yukim
The stencil thickness was about 7 mils and was changed to 6 mils.
Electronics Forum | Tue May 06 10:00:06 EDT 2003 | k_h
Got it, thanks, I've always used english mils. Have you solved the problem yet yukim?
Electronics Forum | Wed May 07 09:24:33 EDT 2003 | davef
Kris The majority of our tombstoning in very small passive SMT is caused by imperfections in end-cap solderability protection plating.
Electronics Forum | Fri May 30 11:24:45 EDT 2003 | dsuraski
We also use microns to describe solder paste powder particle sizes.
Electronics Forum | Thu Apr 24 23:04:45 EDT 2003 | yukim
I've been struggling with this problem for a while. We have two products: A, which is Ok and B, with tombstone defect (0603 & 0805 capacitor chips). A & B have the same design: pad sizes, separation between pads, components orientation. Both have s
Electronics Forum | Wed May 21 12:55:35 EDT 2003 | Zhenya
Several things for your reference: 1. Starting with data collection: - Have you done a measle chart to illustrate the pattern of the defect? - Have you checked the corelation between shift/time and defects rate? - How about a pareto chart? - Do
