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1、收集来的各种手机维修资料（Allkindsofmobilephonemaintenancedatacollected）Commonmachinepoweramplifier-antennaswitchwiringdiagramb.gif[section1doesnotturnonthemachine,faultanalysisFirst,thebootsmallcurrent5-15MAorso(mainlybecauseCPUdoesnotwork)?clockcircuitsarenotnormal(13Mand32.768K)-voltage,AFC,freq
2、uencyTheclockcrystalitselfisdamaged;--replacethecrystalTheclockcrystalproducesasignal,butdoesnotsendittotheCPU;--checkthelinebetweenthecrystalandtheCPUClockpowersupplyisnotnormal(checkpowerorcrystalpowersupplytube)Resetvoltageisnotnormal,mainlyresetcircuitworkisnotnormal(checkthepowerc
3、ircuitoraseparateresettube)TheCPUsupplyisnotnormal,usuallythepowerICdoesnotoutputtheVCCvoltage,orthepowersupplytubeitselfisnotpoweredTheCPUitselfisdamaged(directreplacement)Two,bootcurrentofabout30-60MA(mainlythelogiccircuitworkisnotnormal)ThecharacterlinecircuitisnotworkingproperlyPow
4、ersupplyisabnormalResetisabnormal(poweronresetandpoweronreset)ThechipisnotnormalDatalineandaddresslineareabnormalThefontitselfiscorrupted(referstotheinternaltemporarystorageofthefontortheinternalbrokenlegofthefont)CPUdamage(referstoCPUbrokenlegorcontrollerdamage,MOBLINKseriesCPUbadwill
5、have80-150MAdeadcurrent)Theprograminthefontisoutoforder.Three,bootlargecurrent(pressthebootbuttoncurrentismuchlargerthanthenormalbootcurrent,200-600MArange)Themainpowersupply,loadleakagecausedbythebootlargecurrent,troubleshootingsuchafault,thecircuitmustbefamiliarwithorunderstandthefun
6、ctionofthemotherboarddeviceandpowersupply,inthesepartsofthesedevicesusuallyhavealargecapacitor,Thepositiveelectrodeofthecapacitoristhepowersupplyend,andthereverseresistancevalueofthecapacitorpositivecircuitismeasuredtoknowwhetherthepowersupplylineisleakageornot.Four,pluspoweronthelarge
7、current(referstothepoweronthemotherboard,thepositiveandnegativeleakage)Itismainlycausedbythedamageofcomponentsdirectlysuppliedbybatteries,suchaspoweramplifiercircuit,powersupplycircuit,powersupplytube,chargingcircuit,groundelement,etc.connectedwithpowerline.Thesecondsectioncannotbepo
