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首页 手机触摸屏的维修及代换(Maintenance and substitution of mobi…

手机触摸屏的维修及代换(Maintenance and substitution of mobile phone touch screen).doc

手机触摸屏的维修及代换(Maintenance and sub…

王山琴
2017-10-25 0人阅读 举报 0 0 0 暂无简介

简介:本文档为《手机触摸屏的维修及代换(Maintenance and substitution of mobile phone touch screen)doc》,可适用于社会民生领域

手机触摸屏的维修及代换(Maintenanceandsubstitutionofmobilephonetouchscreen)手机触摸屏的维修及代换(Maintenanceandsubstitutionofmobilephonetouchscreen)MTmobilephonechipofcommonfault:,lowpowerconsumption,andthenshutdownthesolution:findrowresistancevoltagedetection()weldingorchange,noboot,bootscreenclosed,notthesoftware,theMPmemoryforaOK!,MTseriesofcrashes,crashlikearestoredinMPICorCPUbadweld,thebootscreen,removetheMPchipOK!,thesearchnetworkcardtobootoff,ifornotforgeneralpoweramplifierafterweldingunderCPUOK,MTseriesofnormaluseundertheconditionofnosignal,writesoftwareOK!,MTserieschipmachinereceiversilentcheckheadsetheadsetischanged,thefirstvoltagewithoutVshortedtheheadsetfeetFromfeettoflylinephoneheadset,MPmobilephoneisringingwithoutsound,allfaultamplifierweld,duetothelongtimelisteningtomusic,amplifierfevercausedbyweld,theamplifierisaverysmallglassfilmandweldingtimetopayattention,needtorememberthedirectionofIC,thetemperaturemusttakeofffromandthenremovetheglueandthenweldedon,MTserieslaunchshutdown,thefirstpoweruptoaboutV,andtrytoseeiftheemissionnotshutdown,shutdown,poweramplifierisbrokenIfyoudonotshutdown,thepoweramplifierisnotbad,andifthereisaproblemwiththeCPU,nottoengageintheantennamatchingcircuitPowersupplymaintenanceMTautomaticcharging,standby,MTorMTCPUthiskindofcombination,oftenforautomaticcharging,automaticchargerisconnected"and"chargerhassaidthatinaddition,checkthetube,ifnot,thepowersupplyisunlikely,thebaseisCPUdesoldering,afewlinesofEnglishbootandcontinuetorestart,isstoredintheICMPbad,MTseriesappearedinphotography,thefilestorageerrorcanbestoredinIC,forone,canalsoenterthedownloadmodeinthecomputerUdisktoformat,thechargerisconnectedwithCPUwelding,screenlampflashing,weldingCPU,showednochangewhenthewrongMPblocksizescanbestoredwhennodisplay,demolitionisgood,testinstructions*##,*#*#,memorychipObytesinthefilemanagement,firstincomputerformatNottochangetheMPstorageblock,marketSamsungandToshiba,VvoltagedoesnotstartinthefootpowersupplytoBhasaEuropeanOresistance,itsshortcircuitedOK,allthekeyfailure,failurechecksidekeyorakeyisthetopdie,voltagecanbemeasuredinthekey,whileforV,theothersideisOVDetectionofwhichthevoltageisnotnormaltopressureMingresistancecapacitanceitconnectedtothedemolitionInthemobilephonewhenwateriscommonIfthevoltageisCPUAllnormalorbad,akeyforacolumnoronedoesnotwork,checktheconnectionbetweenCPUandkeypowersupplycircuitFirst,theinputcircuitfromthebatterycontactpiecesofcathodedirectlytothepowersupplyforICMT#####inthemiddle,notwhatothercircuits,sointhemaintenanceoftheinputcircuitifthefailuretosupplyICorbad,thebootlineisverysimpleDirectlyproduceaboutVtobootkeyouterpowerfromtheIC#(bootkeyinnergrounding)Whenyoupressthepowerbutton,powersupplyIC#becomeslowleveltriggeredpowerIC,whichproducesavoltageoutputIfthebootlineisbad,thenpressthepowerlinewithoutanycurrentresponseMaintenance:afterpoweristheamountofinnerbootkeywhetherthereisaboutV,ifnot,isthesourceofIC#weldorbroken,boot:requestlineisalsoverysimple,whenyoupressthepowerbutton,thediodewillbootrequestrequestsignal"notice"CPUG#IftherequestdiodeorCPU#weldorbad,CPUhasnotreceivedthebootrequestsignal,itisnot"approved"mobilephonerunningbootprogram,whichwillleadtonotboot,andcurrentsoftware(becausethecurrentsoftwarecannotrunnormally)Summary:onlineortherequestnodewillcausebadnoboot,butthecurrentresponseisnotthesameThereisnocurrentbootlinebadreaction,Badrequestlineforcurrentsoftware,theoutputofthepowersupplylinemaintenance:pressthepowerbutton,thepoweroutputofallpowersupplyIC,checkwhetherthenormalpowersupplyoutputlogic:Thepowerof#(VMEM)=V,andfontThepowerof#(VDD)=VforlogiccircuitThepowerof#(VRTC)=V,forrealtimeclockcircuitThepowerof#(AVDD)=VforlogiccircuitThepowerof#(VREF)=VreferencevoltageThepowerof#(VCORE)=V,CPUMaintenance:pressthepowerbuttonabovethevoltagemeasurement,ifthereisanywayabovethevoltageisnotnormal,itwillsupplyICweldorbadReplantingorreplacementofthepowersupplyICICmodelforMTpowersupply,checkwhetherthenormalpoweroutputforM:#(VTCXO)=VforMcrystal#Note:ifthereisnopowersupplyIC#powersupplyVTCXO=Voutputclock,exceptmaybethepowerburstICfalseorbad,theremaybecausedbybadweldorCPUNote:Mpowersupplycontrolprinciple:outputpowerof#VTCXO=VisaffectedbyaninternalpowersupplyICanormallyopentypeelectronicswitchcontrol(oftencalled,isopenisopen,onlywhenthestartsignalcanbeconducted,andthenormallyopentype)electronicswitchbyCPUT#Thatistosay,onlywhenCPUworkandclockpowersupplystartsignal(VCXOEN),#willhaveapowersupply,VTCXOclockoutputV#VTCXO=so,ifthepoweroutputmaybeabadpowersupplymayalsobeCPbadThemeasuredpower#,toseeifthereisnostartupvoltagefromCPUT#ifthereis,itiscertainlyabadpowersupplyIfthestartvoltageisCPUT#withoutweldorbad,ofcourse,mayalsobecausedbyCPUcannotworkwithoutpowersupplyWorkflowwhenyoupressthepowerbutton,apowersupplyofCPU,CPUwaspartoftheworkafterthepowercontrolvoltageoftheVpowersupplytothe#control,normallyopentypeelectronicswitchisturnedon,VVTCXOforMcrystal#Clockcircuit,Mcircuit:)Mpowersupply:ICpowersupply#VTCXO=VdirectlytotheMcrystal#Powersupplymaintenance:pressthepowerbutton,Mcrystal#isaboutV,ifnot,fortheRFIC#weldorbad)Mcrystaloutput#powersupply,theoutputfromthe#M,acapacitorthrougharesistorandthensenttotheRFICU#,amplifiedRFICinternal,outputfrom#ICMbyRF,acapacitor,andfinallysenttotheCPUA#Theoutputofthemaintenance(showingfrequencymetercanmean):Mcrystal#measuringwhetherthereisM,ifnot,iscrystalbroken,canbereplacedThemeasurementofRFIC#whetherthereareM,ifnot,forcapacitanceorresistancewelding,thetestofRFIC#whetherthereareM,ifnot,fortheRFICweldorbadCheckwhethertheICRFcapacitancebelowAndifnecessary,canalsoremovetheCPU,measuringtheA#toseeifMsentinplace,:clockcircuitwillcauseabadreactiontothesoftwaredoesnotstartthecurrentcurrentMaintenance:inordertodeterminethecircuitisavailableincrystaloscilloscopemeasurement,withoutwaveform,forbadcircuitLogicalcircuitLogiccircuit:CPUtypeMTAT,LRSCisaMPCfont,BGAICmodelcannotsee,checkthefont:fontisdividedintosoftwareandhardwarefaultfault)softwarefault:availablefreetodisassembletheoverride)hardwarefault:ifthesoftwaredoesnotwritefreeonline,youcanwriteafterstillnotboot,removethefontwithrewritingcorrectdatacanbeloadedagainIfinstalledonthemachineyoumustremovethepadsfontfont,measuringtheaddresslineandthedatalineandcontrollineofresistance,ifnotnormaltogroundresistanceforCPUweldorbad,mayalsobebroken(flylinecan)Note:thiscombinationoffontsoftwarewithoutspecialencryption,goodwriting,checktheMPIC:MPweldorbadwillcausenoboot,weldingorreplacementTheroleofMPICistostoreMPsongs,thereisnosingleMPICmobilephone,mobilephoneisbecausethesefontcapacityislargeenough,MPcanputdownthewholesong,CPU:)ifinfrontoftheresistancecheckfontisnotnormal,thentheCPUweldorbadWeightvalueorreplacement)ifthereplacementCPUdoesnotboot,mustbegone:allpowersupplyvoltageCPUpinisinplace,theresetsignalCPUisinplace,theCPUclock(includingM)isinplace,thesoftwareoperatinginstructionsAtpresent,therearemanytypesofmobilephonebasebandchip,thecurrentpopulardomestic,KoreaandTaiwan,OEMOEM"MT"mobilephonechipset,mostareMPandMPEGseriesmobilephone,forexample,doublestar,goldenage,TopeCECT,Sanxinelectric,waveguide,andthree,firstlove,TianShiDaTianKuothree,Konka,Kejian,Au,Lenovo,SANYO,zeising,SR,FSKY,Sk,digitaldragon,universe,iachino,Excelstor,KTECHandothermodelsThischipsetCPUmodels:MT,MTB,MT,MT,MTBetcForthesetypesofmobilephoneCPUwecanusetheMTbrushplatformofmobilephonelibraryofficeupgrade,repaircausedbysoftwarefailuredoesnotboot,bootscreen,mobilephonecanalsoreadfontdatabackupreconciliationphonelockfunctionTherearemanyversionsoftheprogram,thebasicoperationmethodofthesameMTpinfunctionThevoltageofthebatterychargingvoltageofstartchargingaudiopowersupplyfootanaloggroundchargesamplingbypassfilterchargecontrolreferencevoltagechargedetectionclockstartuppowersupplythevoltageofthebatteryboottriggerSIMbootmaintainpowersupplyIMcarddataoscillatorstartSIMcardresetstartringingIMclockbacklightlampSIMcardgroundpowersupplySIMcardoscillatorcontrolSIMringingcontrolcarddataSIMcardresetgroundingSIMclockbacklightcontroldigitalgroundinggroundingmemorypowerbatterytestingbatteryvoltagegroundinglogicpowersupplymemorypowersupplystartdigitalgrounddigitalgroundrealtimeclockbatteryvoltagepowersupplyThechargingdelaycorepowersupplyresetsignalgroundingclocksupplyThepowersupplyunitcircuitworkdetailedA:VBATTinputTVBATTinputforatotaloffivegroups,ofwhichfeetisintermediateandVBATTinterfacechargingoutputstringwithasafetyresistorTwoinput:GNDThree:bootlineMTfootbuttonline,lowleveltrigger,feetandfeetwithaKresistorinseriesThiscircuitdesignistoguaranteethepowersupplyforICdoesnotautomaticallytriggerswitchfeetistomaintainthesignalsentbyCPU,MTCPUissentfromtheBpin,MTCPUissentfromtheLpinsfeetischargingbootline,highleveleffectiveThekeyoffandonhookidentificationbythecommunicationlineandthepowertoaccomplishThemeasureddataICMTpower:powerupfeetfeetfeetfeetfeetisBfeettostarttriggeringvoltsfeettofeetforVVisthereferencevoltageoutputpowersupplyFour:regulatedoutputTheMToutputvoltageisdividedintoseveralStates,controlledanduncontrolledInadditiontotheVCXVMHZabovetheregulatedpowersupplyandpowersupplyiscontrolledbyVMandVSIMCPU,theotherisnotcontrolledbytheCPUThereisastableoutputButasingleVMVCXOpowersupplypowerisoutput,theoutputofselectiveCPUwillcontrolitVMSENsignalsenttoMTVMfeetVpoweredbyCPUtocontrol,lowlevelvoltagehighlevelcutoff,SRCLKENVCXOpoweredbyCPUVsignaltotheMTcontrolpinPressthepowerbutton,ICpoweroutput:feetVfeetVfeetVfeetV(crystalclockpower)forVfeetforVfeetforVfeetfeetfeetfeetfeetfeetfeettothegroundFive:manmachineinterfacecommunicationandcontroltheotherMTpowerandCPUcommunicationcontrolandhumanmachineinterfacecircuit,suchasSIMcardcircuitThelightcircuitvibrationcircuitandthechargingcircuitThefollowinginterfacecircuit:()andCPUSIMcardcommunicationcontrolcircuitMTpowerandCPUSIMcardcommunicationcontrolatotaloffivegroups,anditiswiththeSIMcardinterfaceonlyfourgroupSIMSEListhepowersupplysignalsignalselectioncard,SIMVCCissenttotheCPUsignalpowersupplythetestcard()lightingcircuitMTpowerwithalightcontrolcircuit,CPUcontrol()vibrationcontrolcircuitAlthoughthesignalinthepowersupplycontrolcircuit,butmanymodelsarenotused

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