Electronics Forum | Tue Jan 21 16:28:02 EST 2003 | tony_sauve
Sorry I didn't close this one off last year... We had some failure analysis done on these PCB's ( 3D x-ray,microsectioning,SEM) and the results definitively proved that there was some contamination @ the base of the uvia's that had the voiding. It ap
Electronics Forum | Tue Nov 20 12:48:40 EST 2001 | tony_sauve
We recently experienced a problem w/voids (up to 65%) in uBGA solder joints. The only joints that have the problem correlated to pads which had blind 0.006" via's in them. The via's only extend down 2 layers, of the 18. 21 BGA's on the PCB, only expe
Electronics Forum | Thu Nov 22 12:56:12 EST 2001 | tony_sauve
Thanks for the comments & suggestions. Here's some info garnered from a telecon w/the PCB Fab house: -the blind via's extend from layer 2-17...this was a revelation. The info from our customer was that the via's only extended down 2 layers. Did I men
Electronics Forum | Wed Jul 27 10:52:26 EDT 2022 | madisreivik
Can you post pictures here ? It should be quite straightforward to solve.
Electronics Forum | Wed Jul 27 17:26:55 EDT 2022 | proceng1
I'm having trouble picturing your setup, but can you put kapton on the columns? Or heat shrink tubing?
Electronics Forum | Wed Jul 27 05:31:09 EDT 2022 | lindsaylbb
Aluminum shreds were found inside the tooling hole after depaneling. We ruled out contamination because the tooling holes were covered during depaneling. Out of three holes, only 2 holes with positioning columns inside have aluminum shreds residue.
Electronics Forum | Wed Feb 20 09:29:19 EST 2008 | mun4o
ni, I had similar problem too.I bake PCB in SW mashine - about 8h ,T=90 C.Problem is in the base material of PCB - there are moisture in the material.After my complaint to PCB factory , they change material and the problem disappear.
Electronics Forum | Thu Jan 11 08:51:58 EST 2018 | spoiltforchoice
Well 10K assemblies/month to many is a big number, but then you also describe a PCB with 8 parts on it, 80K parts is not a big number. If you send me a DM I can even get our UK assembly house to quote on it if you like, bare PCB can be sourced from U
Electronics Forum | Fri Sep 02 14:15:44 EDT 2005 | Mika
Check the dimensions of the components in question with a caliper and put the correct numbers in Your part data. Check that the correct nozzle is being used. Also make sure that you have the right pcb height in Your program. This is somewhat criti
Electronics Forum | Thu Sep 23 22:35:30 EDT 1999 | Dreamsniper
Is there a standard rule/guide for the orientation of pcb's in a panel for panelised board (specially for routed panel). i often get this question from peeps here and i kept telling them that it depends on how it affects the process. thanks and regar
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