Lenovo ThinkPad X131e Chromebook Hardware Maintenance Manual

HardwareMaintenanceManual

ThinkPadX131eChromebook

Note:Beforeusingthisinformationandtheproductitsupports,besuretoreadthegeneralinformation

underAppendixA“Notices”onpage61.

ThirdEdition(December2013)

©CopyrightLenovo2013.

LIMITEDANDRESTRICTEDRIGHTSNOTICE:IfdataorsoftwareisdeliveredpursuantaGeneralServicesAdministration
“GSA”contract,use,reproduction,ordisclosureissubjecttorestrictionssetforthinContractNo.GS-35F-05925.

Contents

Aboutthismanual...........iii

Chapter1.Safetyinformation.....1

Generalsafety...............1

Electricalsafety..............1

Safetyinspectionguide...........3

Handlingdevicesthataresensitivetoelectrostatic

discharge.................3

Groundingrequirements...........4

Safetynotices...............4

Chapter2.Generalcheckout.....7

Whattodofirst..............7

Powersystemcheckout...........8

Checkingtheacpoweradapter......8

Checkingoperationalcharging......9

Checkingthebatterypack........9

Chapter3.Importantservice

information..............11

Powermanagement............11

Symptom-to-FRUindex...........11

LCD-relatedsymptoms.........12

Intermittentproblems..........12

Undeterminedproblems.........12

OverviewoftheChromebookUSBrepairshim..13

Creatingtherepairshim.........13

Settingthewrite-protectswitch......14

Usingtherepairshim..........15

Factorytestitems............16

StrategiesforreplacingFRUs.........17

StrategyforreplacingFRUsforGAV......17

FRUidentificationforGAVproducts....17

Chapter4.Statusindicators.....19

Chapter5.Specialkeys........21

Chapter6.Locations.........23

Locatingcomputercontrols,connectors,and

indicators.................23

Frontview...............23

Rearview...............24

Bottomview..............24

LocatingFRUsandCRUs..........24

MajorFRUsandCRUs..........26

LCDFRUsandCRUs..........28

Miscellaneouskitsandotherparts.....29

Chapter7.Removingorreplacinga

FRU..................31

Generalguidelines.............31

Screwnotices...............32

Hardwareidentity.............32

PrerequisiteforreplacingaFRU........33

1010Batterypack.............33

1020Bottomslotcover...........34

1030Memorymodules...........35

1040PCIExpressMiniCardforwirelessLAN..36

1050mSA T Asolid-statedrive.........37

1060PCIExpressMiniCardforwirelessWAN..38
1070Harddiskdriveorsolid-statedrive

assembly.................39

1080Harddiskdrivebracket.........40

1090Keyboard..............41

1110Keyboardbezelassembly........44

1120Microphone.............46

1130Speakerassembly...........47

1140I/Oboard..............48

1150CRTboardassembly(withcable).....49

1160Systemboardassemblyandthermalfan

assembly.................49

1170DC-incableandbasecoverassembly...52

2010LCDunit...............53

2020LCDbezelassembly..........55

2030LCDpanel,LCDcable,andhinges....56

2040Cameraandcameracable........57

2050AntennakitandLCDrearcoverassembly..58

AppendixA.Notices..........61

Electronicemissionnotices..........62

Trademarks................62

AppendixB.Abbreviationtable....63

©CopyrightLenovo2013

i

iiHardwareMaintenanceManual

Aboutthismanual

ThismanualcontainsserviceandreferenceinformationforthefollowingThinkPad

ThinkPadX131eChromebook

Machinetype(MT)6283

TM

®

products.

Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems.

Important:ThismanualisintendedonlyfortrainedservicetechnicianswhoarefamiliarwithThinkPad
products.Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblemseffectively.

BeforeservicingaThinkPadproduct,besuretoreadalltheinformationunderandChapter3“Important
serviceinformation”onpage11.

©CopyrightLenovo2013

iii

ivHardwareMaintenanceManual

Chapter1.Safetyinformation

Thischapterpresentsfollowingsafetyinformationthatyouneedtobefamiliarwithbeforeyouservicea
ThinkPadnotebookcomputer.

•“Generalsafety”onpage1

•“Electricalsafety”onpage1

•“Safetyinspectionguide”onpage3

•“Handlingdevicesthataresensitivetoelectrostaticdischarge”onpage3

•“Groundingrequirements”onpage4

•“Safetynotices”onpage4

Generalsafety

Followtheserulestoensuregeneralsafety:

•Observegoodhousekeepingintheareaofthemachinesduringandaftermaintenance.

•Whenliftinganyheavyobject:

1.Ensurethatyoucanstandsafelywithoutslipping.

2.Distributetheweightoftheobjectequallybetweenyourfeet.

3.Useaslowliftingforce.Nevermovesuddenlyortwistwhenyouattempttolift.

4.Liftbystandingorbypushingupwithyourlegmuscles;thisactionremovesthestrainfromthe
musclesinyourback.Donotattempttoliftanyobjectthatweighsmorethan16kg(35lb)orthatyou
thinkistooheavyforyou.

•Donotperformanyactionthatcauseshazardstothecustomer,orthatmakestheequipmentunsafe.

•Beforeyoustartthemachine,ensurethatotherservicetechniciansandthecustomer'spersonnelare
notinahazardousposition.

•Placeremovedcoversandotherpartsinasafeplace,awayfromallpersonnel,whileyouareservicing
themachine.

•Keepyourtoolcaseawayfromwalkareassothatotherpeoplewillnottripoverit.

•Donotwearlooseclothingthatcanbetrappedinthemovingpartsofamachine.Ensurethatyoursleeves
arefastenedorrolledupaboveyourelbows.Ifyourhairislong,fastenit.

•Inserttheendsofyournecktieorscarfinsideclothingorfastenitwithanonconductiveclip,about8
centimeters(3inches)fromtheend.

•Donotwearjewelry,chains,metal-frameeyeglasses,ormetalfastenersforyourclothing,becausemetal
objectsaregoodelectricalconductors.

•Wearsafetyglasseswhenyouarehammering,drilling,soldering,cuttingwire,attachingsprings,using
solvents,orworkinginanyotherconditionsthatmightbehazardoustoyoureyes.

•Afterservice,reinstallallsafetyshields,guards,labels,andgroundwires.Replaceanysafetydevice
thatiswornordefective.

•Reinstallallcoverscorrectlybeforereturningthemachinetothecustomer.

•Fanlouversonthemachinehelptopreventoverheatingofinternalcomponents.Donotobstructfan
louversorcoverthemwithlabelsorstickers.

Electricalsafety

Observethefollowingruleswhenworkingonelectricalequipment.

©CopyrightLenovo2013

1

Important:

•Useonlyapprovedtoolsandtestequipment.Somehandtoolshavehandlescoveredwithasoftmaterial
thatdoesnotinsulateyouwhenworkingwithliveelectricalcurrents.

•Manycustomershave,neartheirequipment,rubberfloormatsthatcontainsmallconductivefibersto
decreaseelectrostaticdischarges.Donotusethistypeofmattoprotectyourselffromelectricalshock.

•Findtheroomemergencypower-off(EPO)switch,disconnectingswitch,orelectricaloutlet.Ifanelectrical
accidentoccurs,youcanthenoperatetheswitchorunplugthepowercordquickly.

•Donotworkaloneunderhazardousconditionsornearequipmentthathashazardousvoltages.

•Disconnectallpowerbefore:
–Performingamechanicalinspection
–Workingnearpowersupplies
–Removingorinstallingmainunits

•Beforeyoustarttoworkonthemachine,unplugthepowercord.Ifyoucannotunplugit,askthecustomer
topoweroffthewallboxthatsuppliespowertothemachine,andtolockthewallboxintheoffposition.

•Ifyouneedtoworkonamachinethathasexposedelectricalcircuits,observethefollowingprecautions:
–Ensurethatanotherperson,familiarwiththepower-offcontrols,isnearyou.Thatpersonmustbe

theretoswitchoffthepower,ifnecessary.

–Useonlyonehandwhenworkingwithpowered-onelectricalequipment;keeptheotherhandinyour

pocketorbehindyourback.

CAUTION:
Anelectricalshockcanoccuronlywhenthereisacompletecircuit.Byobservingtheabove
rule,youmaypreventacurrentfrompassingthroughyourbody.

–Whenusingtesters,setthecontrolscorrectlyandusetheapprovedprobeleadsandaccessoriesfor

thattester.

–Standonsuitablerubbermats(obtainedlocally,ifnecessary)toinsulateyoufromgroundssuchas

metalfloorstripsandmachineframes.

Observethespecialsafetyprecautionswhenyouworkwithveryhighvoltages.Instructionsforthese
precautionsareinthesafetysectionsofmaintenanceinformation.Useextremecarewhenmeasuring
highvoltages.

•Regularlyinspectandmaintainyourelectricalhandtoolsforsafeoperationalcondition.

•Donotusewornorbrokentoolsandtesters.

•Neverassumethatpowerhasbeendisconnectedfromacircuit.First,checkthatithasbeenpoweredoff.

•Alwayslookcarefullyforpossiblehazardsinyourworkarea.Examplesofthesehazardsaremoistfloors,
nongroundedpowerextensioncables,powersurges,andmissingsafetygrounds.

•Donottouchliveelectricalcircuitswiththereflectivesurfaceofaplasticdentalmirror.Thesurfaceis
conductive;suchtouchingcancausepersonalinjuryandmachinedamage.

•Donotservicethefollowingpartswiththepoweron:
–Powersupplyunits
–Pumps
–Blowersandthermalfanassembly
–Motorgenerators
–Unitssimilartothoselistedabove

Thispracticeensurescorrectgroundingoftheunits.

•Ifanelectricalaccidentoccurs:
–Usecaution;donotbecomeavictimyourself.
–Switchoffpower.
–Sendanotherpersontogetmedicalaid.

2HardwareMaintenanceManual

Safetyinspectionguide

Thepurposeofthisinspectionguideistoassistyouinidentifyingpotentiallyunsafeconditions.Aseach
machinewasdesignedandbuilt,requiredsafetyitemswereinstalledtoprotectusersandservicetechnicians
frominjury.Thisguideaddressesonlythoseitems.Y oushouldusegoodjudgmenttoidentifypotential
safetyhazardsduetoattachmentofnon- ThinkPadfeaturesoroptionsnotcoveredbythisinspectionguide.

Ifanyunsafeconditionsarepresent,youmustdeterminehowserioustheapparenthazardcouldbeand
whetheryoucancontinuewithoutfirstcorrectingtheproblem.

Considertheseconditionsandthesafetyhazardstheypresent:

•Electricalhazards,especiallyprimarypower(primaryvoltageontheframecancauseseriousorfatal
electricalshock)

•Explosivehazards,suchasadamagedCRTfaceorabulgingcapacitor

•Mechanicalhazards,suchaslooseormissinghardware

Todeterminewhetherthereareanypotentiallyunsafeconditions,usethefollowingchecklistatthebeginning
ofeveryservicetask.Beginthecheckswiththepoweroff,andthepowercorddisconnected.

Checklist:

1.Checkexteriorcoversfordamage(loose,broken,orsharpedges).

2.T urnoffthecomputer.Disconnectthepowercord.

3.Checkthepowercordfor:

a.Athird-wiregroundconnectoringoodcondition.Useametertomeasurethird-wireground

continuityfor0.1ohmorlessbetweentheexternalgroundpinandtheframeground.

b.ThepowercordshouldbetheauthorizedtypespecifiedforyourcomputerontheWebpage

http://www.lenovo.com/serviceparts-lookup.

c.Insulationmustnotbefrayedorworn.

4.Checkforcrackedorbulgingbatteries.

5.Removethecover.

6.Checkforanyobviousnon- ThinkPadalterations.Usegoodjudgmentastothesafetyofany
non-ThinkPadalterations.

7.Checkinsidetheunitforanyobviousunsafeconditions,suchasmetalfilings,contamination,wateror
otherliquids,orsignsoffireorsmokedamage.

8.Checkforworn,frayed,orpinchedcables.

9.Checkthatthepower-supplycoverfasteners(screwsorrivets)havenotbeenremovedortamperedwith.

Handlingdevicesthataresensitivetoelectrostaticdischarge

Anycomputerpartcontainingtransistorsorintegratedcircuits(ICs)shouldbeconsideredsensitiveto
electrostaticdischarge(ESD).ESDdamagecanoccurwhenthereisadifferenceinchargebetweenobjects.
ProtectagainstESDdamagebyequalizingthechargesothatthemachine,thepart,theworkmat,andthe
personhandlingthepartareallatthesamecharge.

Notes:

1.Useproduct-specificESDprocedureswhentheyexceedtherequirementsnotedhere.

2.EnsurethattheESDprotectivedevicesyouusehavebeencertified(ISO9000)asfullyeffective.

Chapter1.Safetyinformation3

WhenhandlingESD-sensitiveparts:

•Keepthepartsinprotectivepackagesuntiltheyareinsertedintotheproduct.

•Avoidcontactwithotherpeople.

•Wearagroundedwriststrapagainstyourskintoeliminatestaticonyourbody.

•Preventthepartfromtouchingyourclothing.Mostclothingisinsulativeandretainsachargeeven
whenyouarewearingawriststrap.

•Useagroundedworkmattoprovideastatic-freeworksurface.Thematisespeciallyusefulwhen
handlingESD-sensitivedevices.

•Selectagroundingsystem,suchasthoselistedbelow,toprovideprotectionthatmeetsthespecific
servicerequirement.

Note:TheuseofagroundingsystemtoguardagainstESDdamageisdesirablebutnotnecessary.

–AttachtheESDgroundcliptoanyframeground,groundbraid,orgreen-wireground.

–Whenworkingonadouble-insulatedorbattery-operatedsystem,useanESDcommongroundor

referencepoint.Y oucanusecoaxorconnector-outsideshellsonthesesystems.

–Usetheroundgroundprongoftheacplugonac-operatedcomputers.

Groundingrequirements

Electricalgroundingofthecomputerisrequiredforoperatorsafetyandcorrectsystemfunction.Proper
groundingoftheelectricaloutletcanbeverifiedbyacertifiedelectrician.

Safetynotices

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Chapter1.Safetyinformation5

6HardwareMaintenanceManual

Chapter2.Generalcheckout

Thischapterpresentsfollowinginformation:

•“Whattodofirst”onpage7

•“Powersystemcheckout”onpage8

Besuretoreadthefollowingimportantnotes.

Important:

•Onlycertifiedtrainedpersonnelshouldservicethecomputer.PersonnelrepairingtheLenovo
ChromebookcomputermusthavecompletedthecertificationcoursenumberRTPW1170or
CTPi217.

•BeforereplacinganyFieldReplaceableUnit(FRU),readtheentirepageonremovingandreplacing
FRUs.

•WhenyoureplaceFRUs,itisrecommendedtousenewnylon-coatedscrews.

•Beextremelycarefulduringsuchwriteoperationsascopying,saving,orformatting.Thesequence
ofthedrivesinthecomputerthatyouareservicingmighthavebeenaltered.Ifyouselectanincorrect
drive,dataorprogramsmightbeoverwritten.

•ReplaceaFRUonlywithanotherFRUofthecorrectmodel.WhenyoureplaceaFRU,ensurethatthe
modelofthemachineandtheFRUpartnumberarecorrectbyreferringtotheFRUpartslistontheWeb
pagehttp://www.lenovo.com/serviceparts-lookup.

•AFRUshouldnotbereplacedbecauseofasingle,unreproduciblefailure.Singlefailurescanoccur
foravarietyofreasonsthathavenothingtodowithahardwaredefect,suchascosmicradiation,
electrostaticdischarge,orsoftwareerrors.ConsiderreplacingaFRUonlywhenaproblemrecurs.Ifyou
suspectthataFRUisdefective,cleartheerrorlogandrunthetestagain.Iftheerrordoesnotrecur,do
notreplacetheFRU.

•BecarefulnottoreplaceanondefectiveFRU.

Whattodofirst

WhenyoureturnaFRU,youmustincludethefollowinginformationinthepartsexchangeformorparts
returnformthatyouattachtoit:

1.Nameandphonenumberofservicetechnician

2.Dateofservice

3.Dateonwhichthemachinefailed

4.Dateofpurchase

5.Failuresymptoms,errorcodesappearingonthedisplay,andbeepsymptoms

6.ProcedureindexandpagenumberinwhichthefailingFRUwasdetected

7.FailingFRUnameandpartnumber

8.Machinetype,modelnumber,andserialnumber

9.Customer'snameandaddress

Note:Duringthewarrantyperiod,thecustomermayberesponsibleforrepaircostsifthecomputerdamage
wascausedbymisuse,accident,modification,unsuitablephysicaloroperatingenvironment,orimproper
maintenancebythecustomer.Followingisalistofsomecommonitemsthatarenotcoveredunderwarranty
andsomesymptomsthatmightindicatethatthesystemwassubjecttostressbeyondnormaluse.

Beforecheckingproblemswiththecomputer,determinewhetherthedamageiscoveredunderthewarranty
byreferringtothefollowinglist:

Thefollowingarenotcoveredunderwarranty:

©CopyrightLenovo2013

7

•LCDpanelcrackedfromtheapplicationofexcessiveforceorfrombeingdropped

1

2

3

(20V)

•Scratched(cosmetic)parts

•Distortion,deformation,ordiscolorationofthecosmeticparts

•Plasticparts,latches,pins,orconnectorsthathavebeencrackedorbrokenbyexcessiveforce

•Damagecausedbyliquidspilledintothesystem

•DamagecausedbytheimproperinsertionofaPCCardortheinstallationofanincompatiblecard

•Fusesblownbyattachmentofanonsupporteddevice

•Forgottencomputerpassword(makingthecomputerunusable)

•Stickykeyscausedbyspillingaliquidontothekeyboard

•Useofanincorrectacpoweradapteronlaptopproducts

Thefollowingsymptommightindicatedamagecausedbynonwarrantedactivities:

•Missingpartsmightbeasymptomofunauthorizedserviceormodification.

•Checkforobviousdamagetoaharddiskdrive.Ifthespindleofaharddiskdrivebecomesnoisy,thehard
diskdrivemighthavebeendroppedorsubjecttoexcessiveforce.

Powersystemcheckout

Toverifyasymptom,dothefollowing:

1.T urnoffthecomputer.

2.Removethebatterypack.

3.Connecttheacadapter.

4.Checkthatpowerissuppliedwhenyouturnonthecomputer.

5.T urnoffthecomputer.

6.Disconnecttheacadapterandinstallthechargedbatterypack.

7.Checkthatthebatterypacksuppliespowerwhenyouturnonthecomputer.

Ifyoususpectapowerproblem,seetheappropriateoneofthefollowingpowersupplycheckouts:

•“Checkingtheacpoweradapter”onpage8

•“Checkingoperationalcharging”onpage9

•“Checkingthebatterypack”onpage9

Checkingtheacpoweradapter

Youareherebecausethecomputerfailsonlywhentheacpoweradapterisused.

•Ifthepower-onindicatordoesnotturnon,checkthepowercordoftheacpoweradapterforcorrect
continuityandinstallation.

•Ifthecomputerdoesnotchargeduringoperation,goto“Checkingoperationalcharging”onpage9

Tochecktheacadapter,dothefollowing:

1.Unplugtheacadaptercablefromthecomputer.

2.Measuretheoutputvoltageattheplugoftheacadaptercable.Seethefollowingfigure:

Pin

1+20

20

3

Voltage(Vdc)

Ground

Note:Outputvoltageacrosspin2oftheacpoweradaptermightdifferfromtheoneyouareservicing.

3.Ifthevoltageisnotcorrect,replacetheacadapter.

4.Ifthevoltageisacceptable,replacethesystemboard.

8HardwareMaintenanceManual

Note:Noisefromtheacadapterdoesnotalwaysindicateadefect.

1(+)

2(+)

3

4

5

6(-)

7(-)

Checkingoperationalcharging

Tocheckwhetherthebatterypackchargesproperlyduringoperation,dothefollowing:

Note:Beforeyoubegin,installadischargedbatterypackorabatterypackthathaslessthan50%ofthe
totalpowerremaininginthecomputer.

1.Ifthebatterystatusindicatororicondoesnotturnon,removethebatterypackandletitreturn
toroomtemperature.

2.Reinstallthebatterypack.

3.Ifthebatterystatusindicatorstilldoesnotturnon,replacethebatterypack.

4.Ifthebatteryindicatorstilldoesnotturnon,replacethesystemboard.Otherwise,referto“Checking
thebatterypack”onpage9

tochecktheoriginalbatterypack.

Checkingthebatterypack

Thebatterystatusindicatorislocatedinthelower-rightcornerofthescreen.T oviewthepercentageof
batterypowerremaining,clickthebatterystatusicon.

Note:Ifthebatterypackbecomeshot,itmaynotbeabletocharge.Removeitfromthecomputerandleave
itatroomtemperatureforawhile.Afteritcoolsdown,reinstallandrechargeit.

Tocheckthebatterypack,dothefollowing:

1.T urnoffthecomputeranddisconnecttheacpoweradapter.

2.Removethebatterypackandmeasurethevoltagebetweenbatteryterminals1(+)and7(-).Seethe
followingtable:

Terminal

1+0to+12.6

7

Voltage(Vdc)

Ground(-)

3.Measuretheresistancebetweenbatteryterminals5and7.Theresistanceshouldbe4to30KΩ.Ifthe
resistanceisnotcorrect,replacethebatterypack.

4.Dependingonthevoltagethatyoumeasure,dooneofthefollowing:

•Ifthevoltageislessthan+11.0Vdc,rechargethebatterypack.Ifthevoltageisstilllessthan+11.0V

dcafterrecharging,replacethebatterypack.

•Ifthevoltageismorethan+11.0Vdc,dischargethebatterypackuntilthevoltagebecomesless

than+11.0Vdc,andthenrechargethebatterypack.Ifthevoltagestillislessthan+11Vdcafter
recharging,replacethebatterypack.

Note:Rechargingwilltakeatleastthreehours,evenifthebatterystatusindicatordoesnotturnon.

5.Replacethesystemboardifthenewbatterypackisnotcharged.

Chapter2.Generalcheckout9

10HardwareMaintenanceManual

Chapter3.Importantserviceinformation

Thischapterpresentsthefollowingimportantservice:

•“Powermanagement”onpage11

•“Symptom-to-FRUindex”onpage11

•“OverviewoftheChromebookUSBrepairshim”onpage13

•“StrategyforreplacingFRUsforGAV”onpage17

•“StrategiesforreplacingFRUs”onpage17

Important:

•AdvisecustomerstocontacttheLenovo
TelephonenumbersforLenovoSupportareavailableat:
http://www.lenovo.com/support/phone

•SystemdisassemblyandreassemblyvideosthatshowtheFRUremovalorreplacementproceduresfor
theLenovoauthorizedservicetechniciansareavailableat:
http://www.lenovoservicetraining.com/ion/

®

CustomerSupportCenteriftheyneedanyassistance.

Powermanagement

Toreducepowerconsumption,putthecomputerintosleepmodeifyoudonotuseit.

Whenthecomputerenterssleepmode,thefollowingeventsoccur:

•TheLCDispoweredoff.

•Themicroprocessorstops.

Toentersleepmode,closethelidifyouareloggedin.Toresumefromsleepmode,openthecomputer
lidandpressanykey.

Note:Ifyouarenotloggedin,closingthelidwillshutdownthecomputer.

Incertaincircumstances,thecomputergoesintosleepmodeautomatically:

•Afteraperiodofinactivity

•Whenthebatteryindicatorblinksorange,indicatingthatthebatterypowerislow

Note:Thecomputerdoesnotacceptanyinputimmediatelyafteritenterssleepmode.Waitafewseconds
beforetakinganyactiontoreenteroperationmode.

Also,ineitherofthefollowingevents,thecomputerautomaticallyreturnsfromsleepmodeandresumes
operation:

Symptom-to-FRUindex

Thissectioncontainsfollowinginformation:

•“LCD-relatedsymptoms”onpage12

•“Intermittentproblems”onpage12

•“Undeterminedproblems”onpage12

Thesymptom-to-FRUindexinthissectionlistssomesymptomsandtheirpossiblecauses.Themostlikely
causeislistedfirst,inboldfacetype.

©CopyrightLenovo2013

11

Note:DotheFRUreplacementorotheractionsinthesequenceshowninthecolumnheaded“FRUor

action,insequence. ”IfreplacingaFRUdoesnotsolvetheproblem,puttheoriginalpartbackinthe
computer.DonotreplaceanondefectiveFRU.

ThisindexcanalsohelpyoudeterminewhatFRUsneedtobereplacednextduringregularservicing.

LCD-relatedsymptoms

Important:TheTFTLCDforthenotebookcomputercontainsmanythin-filmtransistors(TFT s).The

presenceofasmallnumberofdotsthataremissing,discolored,oralwayslightedischaracteristicofTFT
LCDtechnology,butexcessivepixelproblemscancauseviewingconcerns.IftheLCDyouareservicinghas
twoorlessvisibledefectivepixels,itshouldnotbeconsideredfaulty.However,iftheLCDhasthreeormore
visibledefectivepixels,itwillbedeemedasdefectivebyLenovoanditshouldbereplaced.

Notes:

•ThispolicyappliestoallThinkPadnotebookcomputerspurchasedon1January,2008orlater.

•LenovowillnotprovidewarrantyreplacementiftheLCDiswithinspecificationsbecausewecannot
guaranteethatanyreplacementLCDwillhavezeropixeldefects

•OnepixelconsistsofR,G,Bsub-pixels.

Table1.LCD-relatedsymptoms

Symptomorerror

Nobeep,power-onindicatoron,andablankLCDduring
POST.

•LCDbacklightnotworking

•LCDtoodark

•LCDbrightnesscannotbeadjusted.

•LCDcontrastcannotbeadjusted.

•LCDscreenunreadable

•Charactersmissingpixels

•Screenabnormal

•Wrongcolordisplayed

HorizontalorverticallinesdisplayedonLCDLCDassembly

FRUoraction,insequence

Systemboard

1.ReseattheLCDconnectors.

2.LCDassembly

3.Systemboard

1.Seeimportantnotefor“LCD-relatedsymptoms.”

2.ReseatallLCDconnectors.

3.LCDassembly

4.Systemboard

Intermittentproblems

Intermittentsystemhangproblemscanbeduetoavarietyofcausesthathavenothingtodowithahardware
defect,suchascosmicradiation,electrostaticdischarge,orsoftwareerrors.FRUreplacementshouldbe
consideredonlywhenaproblemrecurs.

Undeterminedproblems

Ifwrongdevicesareinstalled,orifthesystemsimplyisnotoperating,followtheseprocedurestoisolatethe
failingFRU(donotisolateFRUsthathavenodefects).

Verifythatallattacheddevicesaresupportedbythecomputer.

Verifythatthepowersupplybeingusedatthetimeofthefailureisoperatingcorrectly.(See“Powersystem
checkout”onpage8

)

1.T urnoffthecomputer.

2.VisuallycheckeachFRUfordamage.ReplaceanydamagedFRU.

3.Removeordisconnectallofthefollowingdevices:

12HardwareMaintenanceManual

a.Non- ThinkPaddevices
b.Printer,mouse,andotherexternaldevices
c.Batterypack
d.Harddiskdriveorsolid-statedrive
e.Externaldrive
f.Memorymoduleinstalledinslotb(“1030Memorymodules”onpage35)
g.PCCards

4.T urnonthecomputer.

5.Determinewhethertheproblemhasbeensolved.

6.Iftheproblemdoesnotrecur,reconnecttheremoveddevicesoneatatimeuntilyoufindthefailingFRU.

7.Iftheproblemremains,replacethefollowingFRUsoneatatime(donotreplaceanondefectiveFRU):
a.Systemboard
b.LCDassembly

OverviewoftheChromebookUSBrepairshim

ThissectionprovidesinformationabouttherecoverysolutionontheChromeOS
usingtheChromebookUSBrepairshim(hereafterreferredtoastherepairshim).

TherepairshimisabootabledevicethatisrequiredtoservicetheChromebookcomputer.Therepair
shimisusedforthefollowingpurposes:

•Diagnoseproblemsandrestorethesystemtothefactorydefaultsettings

•Refreshthesystemwiththelatestfirmwareandsoftware

TM

operatingsystemby

TherepairshimisnotnecessarywhenaCustomerReplaceableUnit(CRU)isreplaced.Ifanon-CRUis
broken,orthereisastrongsuspicionthataparticularnon-CRUisdefective,itcanbereplacedbeforeusing
therepairshim.Otherwise,therepairshimmustbeusedbeforeanynon-CRUisreplaced.

ThefollowingisthelistofCRUsforaChromebookcomputer:

•acpoweradapter

•Batterypack

•Bottomslotcover

•Keyboard

•Memorymodule

•T rackpointcap

ForCRUdefinition,see“LocatingFRUsandCRUs”onpage24

.

Creatingtherepairshim

LenovoservicetechniciansneedtodownloadtherepairshimimagefromtheLenovoSupportWebsiteto
createarepairshim.ALenovoservicecredentialisrequiredtodownloadtheimage.

Notes:

•T ocreatetherepairshim,aUSBdevicewithatleast4gigabyte(GB)ofstorageisrequired.Therequired
USBstoragecapacitydependsonthesizeoftherecoveryimage.

•Y oumightalsoneedarecoverytooltocreatetherepairshim.Topreventpotentialperformancerisksor
unexpectedfailure,itisrecommendedthatyouusetheWin32DiskImagertocreatetherepairshim.

•Ensurethatyoucreatetherepairshimusingthelatestversionoftherepairshimimage.Ifyouusean
earlierversion,itmightcausetherepairprocesstofail.

Chapter3.Importantserviceinformation13

Tocreatetherepairshim,dothefollowing:

Attention:CreatingtherepairshimwilldeletealldatastoredontheUSBdevice.T oavoiddataloss,makea
backupcopyofallthedatathatyouwanttokeep.

1.DownloadthelatestversionoftherepairshimimagefromtheLenovoSupportWebsiteat:
http://www.lenovo.com/support

2.Extractthedownloadedfilethatcontainstherepairshimimage.

3.Downloadtherecoverytool.TheWin32DiskImagerrecoverytoolisavailableat:
http://sourceforge.net/projects/win32diskimager/

4.Runtherecoverytoolandfollowtheinstructionsonthescreentocreatetherecoveryshim.

5.AfteryourecovertheChromebookcomputer,formattheUSBdevice.IfyoudonotformattheUSB
device,youwillnotbeabletousethestoragespace.Also,theUSBdevicemightnotberecognizable
bytheWindowsoperatingsystem.

Settingthewrite-protectswitch

Bydefault,theon-boardRead-OnlyMemories(ROMs)aresetaswrite-protected.Beforerefreshingthe
Chromebookfirmware,settheROMsasunprotectedbyflippingthewrite-protectswitchonthesystem
board.

Toflipthewrite-protectswitch,dothefollowing:

1.Disconnecttheacpoweradapterandallcablesfromthecomputer,andthenremovethebatterypack.
See“1010Batterypack”onpage33.

2.Removethebottomslotcover.See“1020Bottomslotcover”onpage34.

3.Dependingonthemodeltype,dothefollowing:

•Formodelswithaharddiskdriveorsolid-statedriveinstalled,removetheharddiskdriveor

solid-statedrive.See“1070Harddiskdriveorsolid-statedriveassembly”onpage39.

•Formodelswithanemptyharddiskdrivebracketinstalled,removetheharddiskdrivebracket.

See“1080Harddiskdrivebracket”onpage40.

4.Removethekeyboard.See“1090Keyboard”onpage41.

5.Removethekeyboardbezelassembly.See“1110Keyboardbezelassembly”onpage44.

6.Locatethewrite-protectswitchonthesystemboardasshowninthefollowingillustration.T oturnoffthe
write-protectfunction,flipthewrite-protectswitchtotheleftasshownbythearrow
write-protectfunction,flipthewrite-protectswitchtotherightasshownbythearrowb.

a.T oturnonthe

14HardwareMaintenanceManual

a

b

7.Afteryouhaveflippedthewrite-protectswitch,reassemblethecomputer.Reinstallthebatterybackand
reconnecttheacpoweradapterandallcables.

Usingtherepairshim

Thissectionprovidesinstructionsonhowtousetherepairshimyouhavecreated.

Tousetherepairshim,dothefollowing:

1.T urnoffthewrite-protectfunction.See“Settingthewrite-protectswitch”onpage14.

2.Disconnecttheacpoweradapter,andthenremovethebatterypack.Waitforaboutfiveseconds.Then
reinstallthebatterypack,andreattachtheacpoweradapter.

3.Waitforaboutfiveseconds.PressandholdEscandtherefreshkey(),andthenpressthepower
buttontostartthecomputerandenterrecoverymode.

4.Whentherecoveryscreenisdisplayed,pressandholdCtrl+D,andthenpressEnter.Thesystem
automaticallyrestartsandentersdevelopermode.

5.T urnoffthecomputer.Thenrepeatstep2andstep3tostartthecomputerandenterrecoverymode.

6.Whentherecoveryscreenisdisplayed,connecttherepairshimtotheUSBconnectorontheright-side
ofthecomputer.Therepairshimwillupdatethefirmwareandimageautomatically.Whentheupdate
processfinishes,thecomputerwillrestartandenterthefactory-test-imageenvironment.

Notes:

•DonotconnecttherepairshimtotheUSBconnectorsontheleft-sideofthecomputer.

•Theupdateprocessisautomatic,andtakeslessthan10minutes.Statusinformationwillbe

displayedonthecomputerscreenduringtheprocess.

7.Removetherepairshimandputitinasafeplace.Followtheinstructionsonthescreentostartthe
factorytextitems.Forinformationaboutthefactorytestitems,see“Factorytestitems”onpage16.

8.Ifthefactorytestitemsrevealedadefectivecomponent,turnoffthecomputer,disconnecttheacpower
adapter,andthenreplacethedefectivecomponent.Formoreinformationaboutthereplacement
procedure,seeChapter7“RemovingorreplacingaFRU”onpage31.

9.T urnonthewrite-protectfunction.See“Settingthewrite-protectswitch”onpage14.

10.T urnonthecomputer,anditwillenterthefactory-test-imageenvironmentagain.Itisrecommendedthat
yourunStressT estandFactoryFlowT esttoensurethatnewcomponentsfunctioncorrectly.

Chapter3.Importantserviceinformation15

Note:Itisnotnecessarytoturnoffthewrite-protectfunctionagainifadditionalcomponentsneed
tobereplaced.

11.RuntheGoogleRequiredT est(GRT)andtheHardwareIdentity(HWID)T est.Ifthetestsfinish
successfully,thesystemwillautomaticallyrestartandentertheChromeOSoperatingsystem.

Notes:

•Ifthesystemboardisreplaced,youarerequiredtoenterthe16-charactermachinetypeandmodel

(MTM)andserialnumber(SN)string.Thestringconsistsofthe4-digitmachinetype,3-digitmodel
number,7-digitSN,andisprecededbythecharacters“1S”.Y oucanfindtheMTMandSNlabel
attachedinthebatterycompartment.ForthelocationoftheMTMandSNlabel,see“Applying
labelstothebasecover”onpage53

IftheMTMandSNarealreadydisplayed,andmatchthenumbersshownonthelabelinthebattery
compartment,pressEsctoleavethevaluesastheyare.

•Ifanytestismarkedasfailed,thefinalprocesswillnotcomplete.Thefinalprocesscanbeforced

tocompletebypressingF .Donotforcethefinalprocesstocompletewhenacomponentfails
thetest.Forcethefinalprocesstocompleteonlywhenthetesthastobebypassed,becauseit
cannotbeperformed.

•Aftertherepairprocessfinishes,thesystemisinacleanout-of-boxstate.Ifapplicable,customers

needtoreenrollthesystemforenterpriseenrollment.

•IftheGRTtestfails,refertothecommonmistakesthatleadtoGRTfailurein“Factorytestitems”

onpage16

.

.

Factorytestitems

Afterthesystementersthefactory-test-imageenvironment,factorytestitemswillrun.Thefactorytest
processcontainsthefollowingthreetypesoftests:

•StressT est:TheStressT estisdesignedtotesthowthesystemfunctionsunderstressbyrunning
themaximumworkloadapplications.TheStressT estincludesthetestofthememorymodule,
microprocessor,andgraphicscard.Thetesttakesabout15minutestofinishandcanbecancelledduring
theprocess.Ifthetestiscancelled,itwillbemarkedasfailed.

•FactoryFlowTest:TheFactoryFlowTestisdesignedtotesttheindividualcomponenttoverifyits
function,suchastheTPM,display,audio,camera,keyboard,andsoon.Itisrecommendedtorunall
theFactoryFlowTestitems.SometestitemsmightrequireanHDMImonitororaSDcard.IftheHDMI
monitororSDcardisnotavailable,thetestscanbebypassed,butwiththeoveralltestmarkedasfailed.

•GRT:GRTtestchecksthesystemstatusandhelpsresetthesystembacktothefactorydefaultsettings.
Ifanythingiswrong,thetestcannotbefinalized.Thefollowingitemsaresomecommonmistakesthat
leadtoGRTtestfailure:

–HWIDmismatch:EachChromebookcomputerhasaknownhardwareconfiguration.Each

configurationisassignedaHWID.HWIDmismatchcanbecausedbyusingunauthorizedparts,or
missingparts.FormoreinformationaboutHWID,see“Hardwareidentity”onpage32

Ifthewrite-protectfunctionisnotturnedoffbeforeusingtherepairshim,itwillalsocauseHWID
mismatch.Forinstructionsonhowtoturnoffthewrite-protectfunction,see“Settingthewrite-protect
switch”onpage14

–VPD(VitalProductData)incorrect:Confirmthatthe16-characterMTMandserialnumberstring

isenteredcorrectly.Forexample,iftheMTMis6283-ABC,andtheserialnumberisLR12345,the
correctstringshouldbe“1S6283ABCLR12345”.

–Write-protectswitchisoff:Systemcannotbefinalizeduntilthewrite-protectswitchisturnedbackon.

.

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16HardwareMaintenanceManual