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1、主板故障全面诊断(Motherboardfaultdiagnosis)Classificationofmainboardfaults1.accordingtotheinfluenceofcomputersystemscanbedividedintononfatalnonfatalandfatalfaultfaultfaultoccursduringthepoweronselftestsystem,thegeneralerrormessage:fatalfaultoccursduringthepow
2、eronselftestsystem,generallycausesystemcrashes・2.accordingtothedifferentrangeofinfluencecanbedividedintolocalandgloballocalfaultfaultfaultsystemreferstooneorseveralfunctionsisnotrunningproperly,suchasthemotherboardprintcontrolchipisdamaged,onlytheonli
3、neprintisnotnormal,doesnotaffectotherfunctions;globalfauItoftenaffectsthenormaloperationofthewholesystem,sothelossofallthefunctions,suchasclockgeneratordamagewillmakethewholesystemparalysis・3.,accordingtothefaultphenomenonisfixed,canbedividedintostabi
4、lityfailureandinstabilityfaultStabilityfailureisfailure,becausethefunctionsofthecomponentsofthecircuitbreaker,short-circuitfaultphenomenoncausedbyrepetitiveandsteady,andtheinstabilityfailureisoftenduetopoorcontact,poorperformaneeofthecomponents,thechi
5、plogicfunctioninthecriticalstateofnormalandnotnormal,sometimescausedby.IftheI/Oslotisdeformed,thedisplaycardisnotincontactwiththeslot,sothatthedisplayisinanunstablestateoferror・4.,dependingontheextentoftheimpact,canbedividedintoindependentfaultsandrel
6、atedfaultsTheindependenceofthefaulttocompleteasinglefunctionofthechipisdamaged;correlationfaultreferstoafaultandotherfaultsassociatedwiththefaultphenomenonformanyfunctionsisnotnormal,butitsessenceisfaultfaultcausedbycommoncontrolfunctions(e.g.,thesoft
7、disksubsystemarenotnormal,andthesoftandharddiskthecontrolcardcontrolfunctionisseparated,thefaultoftenperipheraldatatransmissioncontrolDMAcontrolcircuitonthemotherboard)・5.,accordingtothesourceofproductionfailurecanbedividedintopowerfailure,busfailure,
8、componentfailureApowerfailureincludingthemotherboard,12Vand3.3V+5VpowersupplyandPowerGoodsignalfault;faultfaultfaultandbusbusbuscontrolgenerated;componentfailureincludefaultresistor,capacitor,integratedcircuitchipandothercomponents.Two,themain
