Hi all,

I have a question regarding thermal cycling, a good pcb that has passed all
pretests and post tests with a typical thermal cycle.  A few PCBs were then
hit with a cold spray of -30c and then tested again, after this test a fall
out of 20%.  Are we introducing a crack by the severe thermal shock of the
cold spray or is it revealing a bad solder joint.

Thanks in advance,

Bob Perkins
SMT Process Manufacturing,
Automation Technician
Aimtronics-Delta

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