青業電容失效模式分析

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1、DaisyXu2006/06/26青業電容失效模式分析TeamSunySunDaisyXuZBLongWYHuLucklyJiTZWangFShiDuration:2006/06/15~Contents1.ProblemDescription2.Howtoacceleratethiscapacitorfailure?ProblemDescriptionWhat?---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?---20

2、06/5Where?–光寶生產線HowdoIknow?–產線測試站﹐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CrackProblemDescriptionC333&C311短路,主輸出5V和12V低于SpecFailureAnalysisForCapacitorCrackAIAssembly來料WaveSolderingCapacitorcrack1.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

3、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DQEfocusonmaterialreliability,trytofindaeffectivemethodwhichcanacceleratesuchfailurethroughstressexperimentsExperiments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

4、容材質存在可靠性問題:HASA(vibrationcombinedwiththermalshock)AcautionofusingsuchDC-ratedcapacitor,sothermalshockmaybeaway.ExperimentsPlanNo.TestItemProductsPurposeDurationResult1HASATesting(2hourslong)(-30C~70Cwith20~10Grmsvib)4pcsPSUEvaluationforF/GsCompletedO

5、K2Temperature&HumidityTesting(50Cwith95%humidity)4pcPSUCapacitoranalysis2006/6/15~OK3Temperature&Humiditytest(50Cwith95%humidity)50pcscapacitorsCapacitoranalysis2006/6/15~OK4Vibrationtest(定頻振動)60pcscapacitorsCapacitoranalysis2006/6/17~OK5POSHASATesti

6、ng(24hourslong)(Studying)4pcsPSUCapacitoranalysis2006/6/17~19OK6Thermalshocktesting(24hours:-40C~70C))90pcscapacitorsCapacitoranalysis2006/6/17~19OK7ThermalshockTesting(36hours:-60C~130C)10KpcscapacitorsCapacitorreliabilityanalysis2006/6/22~24NGTestE

7、quipmentTemp.&HumidityChamberVibrationequipmentHASAChamber1pccapacitorof10Kpcsperformedthermalshocktestfailedwhentestedparameters.Thisunitwillbedeliveredtothevendorforfurtheranalysistocheckifthereisanycrackinternal.2.Anygoodideaandusefulexperience,pl

8、easesharewithus.