Hi all,

Currently I'm facing a problem at work. I have a few 6 layers of PCBs
that are perfectly alright, meaning that they passed the ET. However,
when our engineers did some testing after board assembly, problem
surface. When they tighten the board with mounting screws, they found
that one of the supply trace was shorted to the Gnd. This was not shown
during the ET because PCB suppliers only did the test on the bare
boards. So now I am looking into what could possibly cause them to short
together.

I appreciate anyone who can help to provide me with a solution.

Thanks & Best Regards!
Joanne Bock

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