Electronics Forum | Thu Nov 13 09:14:52 EST 2008 | raiders
Hi All, We encounter capacitor crack in the ICT, it contributes 2% of the failure. We are not sure whether these crack coming from the SMT. All these crack having the same pattern. Please refer to attached file. Anybody encounter the same thing befo
Electronics Forum | Thu Nov 13 13:07:04 EST 2008 | vladig
Yes, it does look like a typical crack due to mechanical overloading (bending) of teh component. Usually because of the board flexing Vlad
Electronics Forum | Thu Nov 13 11:45:04 EST 2008 | pbarton
We have seen a similar problem. Turned out to be mechanical stress on the component caused by the method of location and clamping at ICT. Where is the component located on the assembly? Poorly adjusted clamping pillars on clamshell fixtures can cause
Electronics Forum | Wed Jul 10 22:32:46 EDT 2002 | redmary
i just find the gap inside the component from the cross-section, it indeed exists the interal crack, not solder joint crack. but why the failed capacitor is well after some time. and the other suspicion is the quality of the component.
Electronics Forum | Wed Jul 10 18:19:42 EDT 2002 | davef
Flex cracking under the terminations is generally regarded as one of the primary causes of failure of ceramic chips. If you can see cracks in the solder joints from board flex, those chips are certainly strongly suspect, and you must assume there is
Electronics Forum | Fri Jul 12 01:38:06 EDT 2002 | redmary
thanks, Dave. who are specialized in mechnical stress distribution? because I find the gap in the capacitor, but why? If the crack is caused by the exteral mechnical stress, which shape will be formed, zigzag or linear?
Electronics Forum | Wed Jul 10 04:53:47 EDT 2002 | redmary
a leakage exists in the capacitor net (1206), which cause the voltage down so much. the process flow is: printing-placement-reflow-hand load-wave-depanel-FT. I find possible stress maybe exists in the depanel stage, does the extra stress cause the ca
Electronics Forum | Sat Jun 19 00:49:17 EDT 2010 | mun4o
Hi all, lately ofen I have problem with cracked ceramic capacitors.We use 0805 and 0603 cap. Samsung.ICT measure diferent capacity of nominal.If I tray to desoldering component , then component cracked.I think , that the reason is the moisture in com
Electronics Forum | Fri Sep 03 11:28:18 EDT 2004 | KenF
Fine crack in multi-layer ceramic capacitor (MLCC) may not be detectable by capacitance check.Could anyone out there advise which is the most appropriate method to test/detect fine crack ?
Electronics Forum | Fri Jun 25 05:34:40 EDT 2010 | ppcbs
Hi iv40 Try with NIC ceramic capacitor that was tested in wet process. We hav succeed with these cap after we found some failure with Kemet ceramic Cap which tested in dry test process while manufacturing.
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