I would vote for copper dissolution due to lead free HAL. The HASL
process can quickly remove copper in the PTH. Lead free HAL Rework and
your assembly process may advance the condition. A microsection of a
discrepant PTH would answer that question readily.
Paul Reid
Program Coordinator
PWB Interconnect Solutions Inc.
235 Stafford Rd., West, Unit 103
Nepean, Ontario Canada, K2H 9C1
613 596 4244 ext. 229
Skype paul_reid_pwb
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