Electronics Forum | Sun Aug 17 19:06:42 EDT 2014 | natashakt
Hi All, I have been looking in to some failures of PCB's in Assembly. After SMT the boards are stored for different periods of time in high humity environment (72% RH and 21.4 degrees Celsius) before being sent to Assembly to be handsoldered/put thr
Electronics Forum | Wed Feb 21 08:06:23 EST 2007 | davef
The cause could be a lot of different things. As long as you didn't use excessive reflow temperatures, we'd guess that: * Solder mask blister: Your board fabricator should be able to demonstrate through TMA [or equivalent] analysis that the mask wa
Electronics Forum | Mon Jun 08 15:01:02 EDT 1998 | D.Lange
| I work QA at an OEM in Alberta, Canada. I saw earlier posts on the smtnet regarding PCB haloing criteria. I am currently in a dispute with my PCB vendor over the acceptability of haloing (delamination) around plated through holes and vias on a lot
Electronics Forum | Thu Feb 24 14:58:11 EST 2000 | Greg denham
Does anyone have any information on baking boards to remove moisture before reflowing and waving assemblies? I've been told that we should do this to stop such problems as delamination of boards, blow holes, solder balls, etc. I don't know have any e
Electronics Forum | Fri Feb 25 10:23:46 EST 2000 | K3 Equipment
Greg, If you are having a problem, i would first check board manufacturers process. Also are they shipping boards to you in seal packages (a must if you are in a humid part of the country.) Most of the time with a few simple process controls moistur
Electronics Forum | Thu Feb 24 14:58:11 EST 2000 | Greg denham
Does anyone have any information on baking boards to remove moisture before reflowing and waving assemblies? I've been told that we should do this to stop such problems as delamination of boards, blow holes, solder balls, etc. I don't know have any e
Electronics Forum | Fri Feb 25 10:23:46 EST 2000 | K3 Equipment
Greg, If you are having a problem, i would first check board manufacturers process. Also are they shipping boards to you in seal packages (a must if you are in a humid part of the country.) Most of the time with a few simple process controls moistur
Electronics Forum | Tue Jun 06 13:02:44 EDT 2000 | eott
Charles, I am senior engineer in the environmental test lab for Agilent Technologies(HP Spin off). I am working on qualifying a large SCI(Solder Collumn Interposer) CBGA package. The package is 1mm pitch. The balls are .72mm. The number of balls ar
Electronics Forum | Thu Jan 26 14:47:46 EST 2006 | james
Just wondering what others are doing as far MSD parts. We keep most of our parts in the dry cabinet before use. Most bags are openend and have passed the recomendation as far as mounting within a certain time. We have had defects with boards that
Electronics Forum | Thu Aug 08 12:10:18 EDT 2013 | horchak
I have never heard of steaming PCBs. Wouldn't this induce moisture into the PCB and cause more delamination and out gassing? The only way to fix delamination, providing your manufacturing processes are in line is to find a new PCB fab house that can
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