青業電容失效模式分析

1、Daisy Xu2006/06/26青業電容失效模式分析 Team Suny SunDaisy Xu ZB LongWY HuLuckly JiTZ WangF ShiDuration: 2006/06/15Contents 1.Problem Description 2.How to accelerate this capacitor failure? Problem DescriptionWhat?-青業電容(料號701756)在Desktop机种上先后出現不良。机种有PS-5251-08MP-ROHS.When?-2006/5Where? 光寶生產線How do I know? 產線測試

2、站 PE維修站不良表現電容短路使得PSU主輸出5V和12V低于規格不良電容脫漆后內部結构內部CrackProblem Description C333&C311短路,主輸出5V和12V低于SpecFailure Analysis For Capacitor CrackAIAssembly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 re

3、liability, try to find a effective method which can accelerate such failure through stress experimentsExperiments思路1.針對電容制作工藝: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 therm

4、al shock may be a way.Experiments Plan No.Test ItemProductsPurposeDurationResult1HASA Testing (2hours long)(-30C70C with 2010Grms vib) 4pcs PSUEvaluation for F/GsCompleted OK2Temperature &Humidity Testing (50C with 95% humidity)4pc PSUCapacitor analysis2006/6/15OK3Temperature &Humidity test(50C with

5、 95% humidity)50pcs capacitorsCapacitor analysis2006/6/15OK4Vibration test(定頻振動)60pcs capacitorsCapacitor analysis2006/6/17OK5POS HASA Testing (24hours long)(Studying)4pcs PSUCapacitor analysis2006/6/1719OK6Thermal shock testing(24hours: -40C70C)90pcs capacitorsCapacitor analysis2006/6/1719OK7Therma

6、l shock Testing(36hours:-60C130C)10Kpcs capacitorsCapacitor reliability analysis2006/6/2224NGTest EquipmentTemp.& Humidity ChamberVibration equipmentHASA Chamber1pc capacitor of 10Kpcs performed thermal shock test failed when tested parameters. This unit will be delivered to the vendor for further analysis to chec