Hello Techneters,



At the moment we got problem in our PCBs after assembly. (I'm from PCB fabricator)



Some reliability issue has occurred in the PCBs which had been produced within certain period.

It means that PCBs with specific same date code have problem. They need to be discriminated and scrapped.



Is there any way to discriminate 'date code' on PCB without removing component on it?



Date code is fabricated by copper etching (intaglio) and soldermask printed.



We've tried several method like x-ray, SAT.. but it doesn't work.



Any of your advise or comment would be much appreciated.



Have a good day!

jc