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A week start with reported product scrapped due to metal bump. And this sourced from the reason liner crack.
As our QA feedback , 2 pieces previous rework product has failed their parameters, so these 2 products need to scrap inline.
They have already inked off the affected for checking.
crack line detected after back lapping.
Defect detected 100% during AVI scan , tried to salvage with bump metal removal but did not survive in lapping step.
No Choice but to accept, and start to write report for it.