Hello All,

We recently met one problem when we were doing 1000 cycles thermal cycle
test(-40C to +125C) on daisy chain boards.  The resistance change after
1000 cycles is less than 10%, however we see complete barrel crack on PTH
hole walls. Should I accept or reject this test result?  Have you ever met
this kind of problem before?  What did you do on it?

Your advice are highly appreciated.

Best regards,
Lina

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