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1、主板诊断卡(postcard)Seventy—eightIndealingwithcomputerfailure,themotherboarddiagnosticcarddiagnosticcomputerpromptcode78howtosolve?Ibelievethatmanyfriendsindealingwithcomputerfailures,haveencounteredsuchproblems,thenhowtosolveit?Infact,usingthemotherboarddiagnost
2、iccarddiagnosticcomputerpromptcode78isthegraphicscardhasnotself-test,usuallygraphicscardproblems,itisrecommendedtoreplaceone.Ifthegraphicscardcanbeused,itisusuallytheslotandthegoldfingerthatisoutoforder・Sixty-sixComputerfailure,themotherboarddiagnosticcardsh
3、owscode66whatistheproblem,andthememorydoesnotalarmafterpullingout・I'mgoingtodoasimpleanalysisofthisquestion.Thetheoreticaldefinitionofthemainboarddiagnosticcarddisplaycode66isthattheDMAdevice1and2arefinished,andthe59interruptcontrollerwillbeusedastheinitialp
4、reparation.Cacheregistryconfigurationoptimizstion.DMA(DirectMemoryAccess),thatis,directmemoryaccess,isamechanismforfastdatatransfer・Cachebuffer,whichanalyzesthememoryofcomputerroom,graphicscard,ornetworkcardproblems・Theycanberemovedonceandthenwipetheirgolden
5、fingerswithalcohol,andcleanthedustonthemotherboard,plugeachcardagain,restartthecomputer・ocMycomputerfailureoccurredearlier,withthemotherboarddiagnosticcarddiagnosticdisplaycodeOC,inourcarefulinvestigation,andfinallyfoundasolution.Thereasonwhythecomputerappea
6、rsthisfault,becausethereisnocheckCPU,aslongasthepowerbeforethepowerofBeiqiao,andthenaddpowercaneasilysolvethisproblem.Ofcourse,manyfriendshavejuststartedtryingtosolvetheproblemwiththetheoreticaldefinitionofthemotherboarddiagnosticcardcodeOC,thatis,testing825
7、4channels1.Thekeyboardcontrollerpins23and24havebeenblocked/unlocked;theNOPcommandhasbeenissued.Theaddresslinefaultofthefirst64KRAN・Butsomeproblemsstillhavesomethingtodowiththemachineitself・ElevenMotherboarddiagnosticcarddisplaycode11isdefinitelythemotherboar
8、dproblem,firstlookatthememoryofthemotherboardpowersupplyornot,ifnot,seeisnotnexttothepowersupplypipeisbroken;iftoseeifitisBeiqiaofaultorCPUsocketproblem・Motherboarddiagnosticcardcode11:TestDMAch
