ZTE V790 Service Manual

ZTEV790WCDMAMobilePhone
After-salesServiceManual(Level1)

Version1.0

dfdgfdsgs

LEGALINFORMATION

Copyright©2009ZTECORPORATION.

Thecontentsofthisdocumentareprotectedbycopyrightlawsandinternationaltreaties.Anyreproduc­tionordistributionofthisdocumentoranyportionofthisdocument,inanyformbyanymeans,without
thepriorwrittenconsentofZTECORPORATIONisprohibited.Additionally ,thecontentsofthisdocument
areprotectedbycontractualcondentialityobligations.

Allcompany,brandandproductnamesaretradeorservicemarks,orregisteredtradeorservicemarks,
ofZTECORPORA TIONoroftheirrespectiveowners.

Thisdocumentisprovided“asis” ,andallexpress,implied,orstatutorywarranties,representationsor
conditionsaredisclaimed,includingwithoutlimitationanyimpliedwarrantyofmerchantability ,tness
foraparticularpurpose,titleornon-infringement.ZTECORPORATIONanditslicensorsshallnotbeliable
fordamagesresultingfromtheuseoforrelianceontheinformationcontainedherein.

ZTECORPORATIONoritslicensorsmayhavecurrentorpendingintellectualpropertyrightsorapplica­tionscoveringthesubjectmatterofthisdocument.Exceptasexpresslyprovidedinanywrittenlicense
betweenZTECORPORATIONanditslicensee,theuserofthisdocumentshallnotacquireanylicenseto
thesubjectmatterherein.

ZTECORPORATIONreservestherighttoupgradeormaketechnicalchangetothisproductwithoutfurther
notice.

UsersmayvisitZTEtechnicalsupportwebsitehttp://ensupport.zte.com.cntoinquirerelatedinformation.

TheultimaterighttointerpretthisproductresidesinZTECORPORATION.

RevisionHistory

RevisionNo.RevisionDateRevisionReason

V1.02012–11–05

EditedbyZTEUniversity

PublishingDate:2012–11–05

1ProductSummary....................................................1

1.1ProductOverview.................................................................1

1.2StandardConguration..........................................................1

1.3Specications.......................................................................1

1.4MainFunctions.....................................................................2

2FunctionTest...........................................................3

2.1NFFT est.............................................................................3

2.2IMEIChecking......................................................................4

2.3SoftwareVersionChecking.....................................................4

3SoftwareDownload.................................................5

3.1BeforeY ouBegin..................................................................5

3.1.1ComputerandSystemRequirements...............................5

3.1.2DataCable..................................................................5

3.1.3ServiceSoftware..........................................................5

3.1.4Cautions.....................................................................5

3.2InstallDriver.......................................................................6

3.3CheckCOMPort.................................................................11

3.4DownloadSoftware.............................................................12

3.5ExportDownloadInformationFile..........................................15

4Disassembly..........................................................19

4.1DisassemblyT ools..............................................................19

4.2ExplodedView..................................................................19

4.3DisassemblyFlowChart.......................................................20

4.4DisassemblySteps..............................................................21

4.5Composing........................................................................31

5PrincipleandMainboard........................................33

5.1PrincipleBlockDiagram.......................................................33

5.2BasicComponentDistribution...............................................34

5.3PCBLayout........................................................................36

6Troubleshooting....................................................39

6.1HousingFailure..................................................................39

6.2BatteryFailure...................................................................39

6.3SwitchingOnFailure...........................................................39

6.4Hanging............................................................................40

6.5AutomaticallySwitchingOff..................................................40

6.6ChargingFailure.................................................................41

6.7USIMCardUnidentied........................................................41

6.8T-FlashCardFailure............................................................42

6.9NoT ransmittedVoice...........................................................42

ZTECondential

Page1of52

6.10NoReceivedVoice.............................................................42

6.11NoRingTone...................................................................43

6.12VibrationF ailure...............................................................43

6.13T ouchscreenfailure..........................................................44

6.14DisplayFailure..................................................................44

6.15CameraF ailure.................................................................45

6.16KeypadBacklightFailure....................................................45

6.17WiFi/Bluetooth/FMFailure...................................................45

6.18NoSignal........................................................................46

6.19NoCallsOut.....................................................................46

7FinalTest..............................................................47

7.1FinalSoftwareVersionChecking............................................47

7.2FinalFunctionTest..............................................................47

8Appendix...............................................................49

8.1After-SalesT echnicalSupportWebsite....................................49

ZTECondential

Page2of52

1ProductSummary

1.1ProductOverview

Note:

Thepictureisforreferenceonly,pleasemaketheobjectasstandard.

1.2StandardConguration

NO.NameQTY

1Handset1

2Battery1

3Charger1

4Datacable1

5Usermanual1

1.3Specications

�Frequency:GSM900/1800/1900MHz,WCDMA900/2100MHz

�Operatingsystem:Android4.0

�Dimensions:116mm×61.7mm×12.6mm

�Weight:about120g(includebattery)

ZTECondential

Page1of52

�LCD:3.5inch320×480pixelsHVGAresolution,262Kcolor

�Camera:2.0megapixelCMOSsensor

�Batterycapacity:1200mAh

�ExternalT-ashcard:upto32GByte.

�Earphone:standard3.5mmearphone

1.4MainFunctions

�Supportdualmodeanddual(U)SIMcard.

�SupportSMS,MMS,phonebookandvoicemail.

�SupportGPS,bluetooth,WiFiandFM.

�SupportMP3,MP4,cameraandvideo.

�SupportE-mail,WAP2.0andWWWbrowser .

�Supportandroidapplicationsoftware.

ZTECondential

Page2of52

2FunctionTest

2.1NFFTest

NFFFlowChartItemsStepsandRequirementsTools

(1)

Ba-

sicre-

quire-

ments

(2)

Fault

replay

(3)
Basic
func-

tion
test

(4)

Call
test

(5)
Cha­rging

test

Con-

clu-

sion

1.Checkwhethertheaccessoriesin
salespackagearecomplete.

2.Makesurethatthereisnottoo
muchdustonthelens.

3.Thecolorofwaterprooflabel
shouldremainunchanged.

4.Makesurethemobilephonehas
nophysicaldamage.

5.Themobilephoneshouldbestill
underwarranty .

1.Insertatestcardandbattery .
PressthePowerkeyandcheck
whetheritcanbeswitchedon.

2.Restorefactorysettings(referto

UserManualfordetails).

3.T estthereportedfaultsandmake
surethatthefaultsdonotreplay .

Press*983*70#andthemobile
phonewilldobasicfunctiontestau­tomatically.

Ifthecodefailstoactivatebasic
functiontest,visuallyinspectLCD
andmanuallytestringtone,vibra­tion,keypad,cameraandthelike.

1.Dialoperatorservicephonenum­berandmakesurethatthespeech
qualityisgood.

2.Insertamatchedheadset.Make
surethatthereal-timespeechqual­ityisgoodandyoucanhangupnor­mally.

Insertthematchedchargerand
makesurethatitcancharge.

Testthemobilephonefromstep(1)to(5).
Stoptestifyoundfaultsatonestep.And
themobilephoneisfaulty .Ifthereisnofault
afteryounishtest,themobilephoneisanNFF
phone.

Note:refertoUserManualfortheitemsthat
theabovevestepscannottest.

/

Test
card
and
bat­tery

Test
card
and
bat­tery

Bat-

tery,

head-

setand

test

card

Bat-

tery
and

char-

ger

ZTECondential

Page3of52

2.2IMEIChecking

Press*#06#andcheckwhethertheIMEIshownintheLCDisthesamewith
theonesinthelabel,packagingandcerticate.

2.3SoftwareVersionChecking

Press[Menu→ →→Settings→ →→Aboutphone→ →
thesoftwareversionisthelatestone.

→

Buildnumber]tocheckwhether

ZTECondential

Page4of52

3SoftwareDownload

3.1BeforeYouBegin

3.1.1ComputerandSystemRequirements

�Computerprocessor:Pentium500MHzorhigher

�RAM:128MBormore

�Diskspace:50MBormore

�Supportedoperatingsystem:Windows2000/XP ,Vista

3.1.2DataCable

Materialcodeofdatacable:052621600325

3.1.3ServiceSoftware

TypeName

Driver

Download

platform

Softwareversion

OfcesoftwareMicrosoftExcel

5.2066.1.14

SalesMultiDL_MSM-

7227V1.00.01

00000B0000ZTE_WC-

DMA_7227V1.0.0

Thedriverisusedtoenablethe
computertoidentifythenew
hardware.Usethelatestversion
todooperation.

Theplatformversionisfor
referenceonly .Usethelatest
versiontodosoftwaredownload.

Thesoftwareversionisfor
referenceonly .Usethelatest
versiontodosoftwaredownload.
Besuretoupgradethesoftware
versionofeachfaultymobile
phonetothelatestone.

Toexportdownloadinformation
le.

Description

3.1.4Cautions

�Thesoftwareversionofeachfaultymobilephoneshouldbeupgradedto

thelatestone.

�Thesoftwareversion,downloadplatformsoftwareanddriverinthisdoc-

umentareforreferenceonly ,usethelatestsoftwaretodothesoftware
download.

ZTECondential

Page5of52

�Besuretobackupalluserdatainthemobilephonebeforesoftware

download.

�TakeouttheUSIMcardfrommobilephonebeforesoftwaredownload.

�Donotdisconnectmobilephoneandcomputerinthedownloadprocess.

�Themobilephonewillbeoutofuseinthedownloadprocess.

�Thebatteryisunnecessaryduringinstallingdriverordownloadingsoft-

ware,soyoudonotneedtoinstallbatterytothemobilephone.

3.2InstallDriver

Prerequisite

Pleaseusethelatestversionofcabledriver .

Steps

1.Double-clicktheicontoinstalldriver .

2.SelectthesetuplanguageandclickOK.

ZTECondential

3.ClickNext.

4.ClickNext.

Page6of52

5.ClickInstall.

6.Installingthedriver .

ZTECondential

Page7of52

7.Installsuccessfully,clickFinish.

8.IftheFoundNewHardwareWizardappearsafterinstalledthedriver ,

trytoinstallthedriverasfollows.

9.SelectInstallfromalistofspeciclocation(Advanced)andclick

Next.

ZTECondential

Page8of52

10.SelectDon’tsearch.IwillchoosethedrivertoinstallandclickNext.

11.SelectPorts(COM&LPT)andclickNext.

ZTECondential

Page9of52

12.SelectZTEHandsetDiagnosticInterfaceandclickNext.

13.Installsuccessfully,clickFinish.

ZTECondential

Page10of52

--Endofsteps.--

3.3CheckCOMPort

1.Pressandholdthedownvolumekey .

2.ConnectmobilephoneandcomputerwiththedefaultMicro-USBcableto

entertheFTMmode.

3.Right-clickMyComputer,andclick[Manage→ →

Ports(COM&LPT)]tochecktheCOMportZTEHandsetDiagnostic
Interface(DFU)(COM**).

→

DeviceManager→ →

→

ZTECondential

Page11of52

3.4DownloadSoftware

Prerequisite

Note:

�Thebatteryisunnecessaryduringdownloadingsoftware.

�MakesurethemobilephoneisinFTMmodebeforedownloadingsoftware.

�Thedownloadprocesslastsabout5minutes.

Steps

1.Pressandholdthedownvolumekey .

2.ConnectmobilephoneandcomputerwiththedefaultMicro-USBcableto

entertheFTMmode.

3.Openthedownloadplatformlefolder ,anddouble-clicktheiconto

startuptheplatform.

4.Maininterfaceofdownloadplatformsoftwareisasfollows.

ZTECondential

5.Click[Option→ →

→

PortCong]tosettheport.

Page12of52

6.Selectthecorrectport,andclickOK.

7.ClickSWDirectorytoselectsoftwarele.

ZTECondential

Page13of52