Hello Consultation for ceriteria about bare copper This failure caused by solder stamp from selective soldering process,check it via miroscope trace is slight damgae and did not bridge with adjacent noncommon circuit ,then check circuit that it just link to ground, and check IPC-A-610E,just found solder mask voild /blister .Can we refer this to judge this failure ? (Class 3 is our acceptance ) Many thanks Failure pic: ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________