8 Discipline Report_LCD no display issue.doc

Problem Solving 8D Report Version: 0.1Model 2Product 2Customer 2Roberts 17NotebookRosaSubject 2Roberts 17 LCD no display issueSub-tier High-tec LCD cable material NG(pin 空焊)Discipline 1: Team member / External member 2Leader: FAE/Rong LinRecord Keeper: FAE/Rong Lin Team Member: FAE/ Rong Lin; SQM/Nancy Pan; QC/Betty Zou; MC/Great Chen; PC/Frank Xuan; PD/Lemon TangDiscipline 2: Describe the Problem 7Date: 2009/8/2Basic Information:Failure Symptom: LCD no displayStage: FA Function test Station Date/Time: 2009/8/2 14:35NG QTY: 5Failure Rate:5/985= 5076 DPPM Detail Descriptions: FA 開機顯示測試發現 5pcs LCD no display system, 分析發現 LCD cable raw material NG(pin空焊), vendor: High-tec, D/C focus on 07/10. Pin 20Pin 35那個站別發生？Discipline 3: Implement and Verify Short-Term Corrective Actions 5Date: 200/8/2Containment Action PIC: WKS/ SQM/Nancy PC/Frank MC/Great Target Date:2008/8/3WKS sorting result: 1. 8/2 Sub-tier 集中 sorting 所有 High-tec and wistron LCD cable, 合計 8K pcs (Wistron 2k pcs and High-tec 6k pcs), NG: 0 pcs. (Failure Rate: 0/62=0%)Sorting method: vibration test and electronic test. Sorting result:Sorting the High-tec LCD cable 8k pcs 未發現NG. (Failure Rate: 0/8K=0%)FA 對Sorting后LCD cable 8k pcs組裝開機顯示測試，未發現LCD no display.(Failure Rate: 0/8K=0%)已經上線的機台是否有sorting? 是否有risk ?Discipline 4: Define and Verify Root Causes 8Date: 2009/8/3Analysis:- Principle : Roberts 17 LCD cable raw material NG- Circuit Diagram :並沒有詳細說明是怎麼分析出與LCD Cable有關?- Possible causes :檢查所有 LCD display相關 power and signal.檢查 LCD cable 發現LCD 1 signal pin open.那根pin open ?這根訊號的作用是什麼？導致LCD cable Pin 35 20 open 可能原因:1. LCD cable con 空焊.2. LCD cable 有異物.3. LCD cable pin 變形.- Verification:Dispatched LCD cable 發現 LCD con pin空焊.請提供pin空焊的放大照片.Pin 20Pin 35Root Cause : Wistron SQM sent NG material to High-tec High-tec分析Hot-bar頭溝槽包容線材不夠，導致線材吃錫不足，而導致空焊。為什麼Hot-bar頭溝槽包容線材不夠 ? (還沒問到真正的Root Cause)Discipline 5: Verify Corrective Actions 5Date: 2009/8/3- Corrective Action PIC: SQM/Nancy Target Date: 2009/8/3 Wistron 轉用第二家廠商 wanshih LCD cable.Wistron SQM 將NG material送廠商.Wistron 指定廠商sorting material and用blue on extre-cable 標示 attached:內容不符: 針對root cause的結果應該有哪些可行的對策Discipline 6: Implement Permanent Corrective Actions 5Date: 2009/8/6- Verification Action Verified by: FAE/Rong Lin Date: 2009/8/6 1. High-tec 8/5 將Hot-bar頭溝槽深度 0.32mm to 0.35mm, 從而使Hot-bar頭溝槽包容線材 85% to 92%.2. High-tec require visual inspection operator not only use magnify but also 100% use a slight pick-pin DIP joints in order to confirm core wire is welded solid. Cut in on 8/6.3. High-tec 8/6在function test 之前增加100% vibration test 和更新SOP . 4. 2009/8/102009/08/17 FA對High-tec new material組裝測試未發現LCD no display （Failure Rate: 0/23765=0%）Discipline 7: Prevent Recurrence 3Date:2009/8/16- Standardization: Wistron QC 對High-tec LCD cable 來料per 1/100 抽樣檢查.內容錯誤 PIC: QC/Betty Date: 2009/8/16 Discipline 8: Congratulate Your Team 5Date:2009/9/112009/8/2 08:302009/8/2 14:35 Failure