Electronics Forum | Fri May 17 07:38:30 EDT 2019 | stephendo
If it happened after a high energy event then maybe the root cause is a lack of TVS diodes in the design of the circuit. Or if they are ceramic diodes then maybe they are too close to the edge and have flex cracks.
Electronics Forum | Tue May 21 15:21:20 EDT 2019 | emeto
Matt, believe it or not, but mechanical stress is cracking these internally and you can't see it with bare eye. Consider de-paneling as a root cause if parts are close to the de-panel V-score edge/router tabs. I can send you more information.
Electronics Forum | Tue May 28 02:09:47 EDT 2019 | robl
Back in the day when everyone had turret chipshooters we used to see a lot of cracking due to incorrect z heights, especially where customers swapped between manufacturers.
Electronics Forum | Fri May 31 05:54:09 EDT 2019 | dhanish
What are the common cause for solder joint crack after the pcba go through Temperature cycling test ?We have seen failure on solder joint for the memory part.
Electronics Forum | Fri May 31 10:15:30 EDT 2019 | davef
Major sources of crack in the solder connection after thermal cycling are: * Thermal heating caused by differences in thermal expansion between the board and the component * Lead-free solder is more rigid and brittle than eutectic solder in simila
Electronics Forum | Mon Jun 24 23:21:27 EDT 2019 | sssamw
You may need tell us the background, how PCBA being tested, the test setting and spec. Solder crack maybe due to CTE mismatch or mechanical strain.
Electronics Forum | Mon Aug 19 07:42:59 EDT 2019 | robl
At least one of them looks like a handling issue to me - the last picture shows the crack going into the termination as a scratch on the right side - as if someone has slid another board into a magazine without leaving enough space. This one looks li
Electronics Forum | Mon Nov 18 09:04:20 EST 2019 | davef
Review: * Too much placement force * Underside supports are set incorrectly * Component height set incorrectly * Downstroke location of either the pick or placement set incorrectly * Nozzle that is smaller than recommended for the part * Part
Electronics Forum | Thu Apr 01 20:07:06 EDT 2021 | smith88
Is there a standard that gives criteria for cracks in Ferrite Cores? I have reviewed Jstd-oo1 G and IPC 610 G and do not see a specific reference to Ferrites. Thanks for your help
Electronics Forum | Mon Feb 06 17:58:16 EST 2023 | davef
The September 29, 2022 Express Newsletter [ https://smtnet.com/express/index.cfm?fuseaction=archives&issue=20220929 ] has papers on chip cracking
.gif)
