??? ??? ???? ??????? ???? ???? ????? ??5 Why后的根本原因8.23LPC-823R品质周期生产产量对策确认完成日MODEL品名供应商5th Why4th Why3rd Why2nd Why1st Why问题点类型5W后根本原因倒出5 Why后的根本改善方案问题点□管理项目未达□Buyer Claim□QA不良□来料不良□Line不良□OQC不良5 Why后