I have a couple of mass production issues, please advice:
Issue A. Step 1. The product was pass the ATE test, when it go through the production line. Step 2. Randomly choose fewer samples to do hand test. Step 3. Some samples fail, compare the firmware, it is different to correct firmware. ( but it pass the firmware check in ATE station! @@~)
Issue B. When test by hand and found a fail unit, the firmware is the same ( correct ), but behavior is different ( fail ) ( also pass the ATE test at beginning). In this case, we saw different EE behavior ( a power pin has different behavior, it should no voltage at this moment, but it has), but after re-download the firmware, the problem gone!
Please kindly share with your experience or any comments.
Thank you very much! Best regards, Boki.