青業電容失效模式分析(精品).ppt

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1、P&C SBG PC SBUDaisy Xu2006/06/26青業電容失效模式分析青業電容失效模式分析 P&C SBG PC SBUTeam Suny SunDaisy Xu ZB LongWY HuLuckly JiTZ WangF ShiDuration:2006/06/15P&C SBG PC SBUContents 1.Problem Description 2.How to accelerate this capacitor failure?P&C SBG PC SBUProblem DescriptionlWhat?-青業電容青業電容(料號料號701756)在在Desktop机种

2、上先后出現不良。机种上先后出現不良。机种有机种有PS-5251-08MP-ROHS.lWhen?-2006/5lWhere?光寶生產線光寶生產線lHow do I know?產線測試站產線測試站 PE維修站維修站l不良表現不良表現電容短路電容短路使得使得PSU主輸出主輸出5V和和12V低于規格低于規格不良電容不良電容脫漆后內部結构脫漆后內部結构內部CrackP&C SBG PC SBUProblem Description C333&C311短路短路,主輸出主輸出5V和和12V低于低于SpecP&C SBG PC SBUFailure Analysis For Capacitor CrackA

3、IAssembly來料Wave SolderingCapacitor crack1.來料品質差.即該料制作工藝.材質存在缺陷,經由客戶組裝使用缺陷隨時可能暴發2.此顆元件為AI植件,机器植件過程,元件可能受傷3.高溫波峰焊+快速冷卻熱脹冷縮可能使內部開裂4.組裝時不甚碰傷可能的原因DQE focus on material reliability,try to find a effective method which can accelerate such failure through stress experimentsP&C SBG PC SBUExperiments思路1.針對電容制

4、作工藝:假如存在缺陷使內部容易Crack:制作工藝缺陷振動(a:電容單体定頻振動b:整机振動)高溫高濕測試(電容單体&整机)2.針對電容材質存在可靠性問題:HASA(vibration combined with thermal shock)A caution of using such DC-rated capacitor,so thermal shock may be a way.P&C SBG PC SBUExperiments Plan No.Test ItemProductsPurposeDurationResult1HASA Testing(2hours long)(-30C70C

5、 with 2010Grms vib)4pcs PSUEvaluation for F/GsCompleted OK2Temperature&Humidity Testing(50C with 95%humidity)4pc PSUCapacitor analysis2006/6/15OK3Temperature&Humidity test(50C with 95%humidity)50pcs capacitorsCapacitor analysis2006/6/15OK4Vibration test(定頻振動定頻振動)60pcs capacitorsCapacitor analysis200

6、6/6/17OK5POS HASA Testing(24hours long)(Studying)4pcs PSUCapacitor analysis2006/6/1719OK6Thermal shock testing(24hours:-40C70C)90pcs capacitorsCapacitor analysis2006/6/1719OK7Thermal shock Testing(36hours:-60C130C)10Kpcs capacitorsCapacitor reliability analysis2006/6/2224NGP&C SBG PC SBUTest Equipme

7、ntTemp.&Humidity ChamberVibration equipmentHASA ChamberP&C SBG PC SBU1.1pc capacitor of 10Kpcs performed thermal shock test failed when tested parameters.This unit will be delivered to the vendor for further analysis to check if there is any crack internal.2.2.Any good idea and useful experience,please share with us.