Lenovo ThinkPad X131e Owner's manual

HardwareMaintenanceManual
ThinkPadX131eChromebook

Note:Beforeusingthisinformationandtheproductitsupports,besuretoreadthegeneralinformation
underAppendixA“Notices”onpage61.
SecondEdition(June2013)
©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
Whattodorst..............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
FRUidenticationforGAVproducts....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
1050mSATAsolid-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
©CopyrightLenovo2013i

iiHardwareMaintenanceManual

Aboutthismanual
ThismanualcontainsserviceandreferenceinformationforthefollowingThinkPad®products.
ThinkPadX131eChromebookTM
Machinetype(MT)6283
Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems.
Important:ThismanualisintendedonlyfortrainedservicetechnicianswhoarefamiliarwithThinkPad
products.Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblemseffectively.
BeforeservicingaThinkPadproduct,besuretoreadalltheinformationunderandChapter3“Important
serviceinformation”onpage11.
©CopyrightLenovo2013iii

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.
©CopyrightLenovo20131

Important:
•Useonlyapprovedtoolsandtestequipment.Somehandtoolshavehandlescoveredwithasoftmaterial
thatdoesnotinsulateyouwhenworkingwithliveelectricalcurrents.
•Manycustomershave,neartheirequipment,rubberoormatsthatcontainsmallconductivebersto
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.Thatpersonmustbethere
toswitchoffthepower,ifnecessary.
–Useonlyonehandwhenworkingwithpowered-onelectricalequipment;keeptheotherhandinyour
pocketorbehindyourback.
CAUTION:
Anelectricalshockcanoccuronlywhenthereisacompletecircuit.Byobservingtheabove
rule,youmaypreventacurrentfrompassingthroughyourbody.
–Whenusingtesters,setthecontrolscorrectlyandusetheapprovedprobeleadsandaccessoriesfor
thattester.
–Standonsuitablerubbermats(obtainedlocally,ifnecessary)toinsulateyoufromgroundssuchas
metaloorstripsandmachineframes.
Observethespecialsafetyprecautionswhenyouworkwithveryhighvoltages.Instructionsforthese
precautionsareinthesafetysectionsofmaintenanceinformation.Useextremecarewhenmeasuring
highvoltages.
•Regularlyinspectandmaintainyourelectricalhandtoolsforsafeoperationalcondition.
•Donotusewornorbrokentoolsandtesters.
•Neverassumethatpowerhasbeendisconnectedfromacircuit.First,checkthatithasbeenpoweredoff.
•Alwayslookcarefullyforpossiblehazardsinyourworkarea.Examplesofthesehazardsaremoistoors,
nongroundedpowerextensioncables,powersurges,andmissingsafetygrounds.
•Donottouchliveelectricalcircuitswiththereectivesurfaceofaplasticdentalmirror.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
whetheryoucancontinuewithoutrstcorrectingtheproblem.
Considertheseconditionsandthesafetyhazardstheypresent:
•Electricalhazards,especiallyprimarypower(primaryvoltageontheframecancauseseriousorfatal
electricalshock)
•Explosivehazards,suchasadamagedCRTfaceorabulgingcapacitor
•Mechanicalhazards,suchaslooseormissinghardware
Todeterminewhetherthereareanypotentiallyunsafeconditions,usethefollowingchecklistatthebeginning
ofeveryservicetask.Beginthecheckswiththepoweroff,andthepowercorddisconnected.
Checklist:
1.Checkexteriorcoversfordamage(loose,broken,orsharpedges).
2.Turnoffthecomputer.Disconnectthepowercord.
3.Checkthepowercordfor:
a.Athird-wiregroundconnectoringoodcondition.Useametertomeasurethird-wireground
continuityfor0.1ohmorlessbetweentheexternalgroundpinandtheframeground.
b.ThepowercordshouldbetheauthorizedtypespeciedforyourcomputerontheWebpage
http://www.lenovo.com/serviceparts-lookup.
c.Insulationmustnotbefrayedorworn.
4.Checkforcrackedorbulgingbatteries.
5.Removethecover.
6.Checkforanyobviousnon-ThinkPadalterations.Usegoodjudgmentastothesafetyofany
non-ThinkPadalterations.
7.Checkinsidetheunitforanyobviousunsafeconditions,suchasmetallings,contamination,wateror
otherliquids,orsignsofreorsmokedamage.
8.Checkforworn,frayed,orpinchedcables.
9.Checkthatthepower-supplycoverfasteners(screwsorrivets)havenotbeenremovedortamperedwith.
Handlingdevicesthataresensitivetoelectrostaticdischarge
Anycomputerpartcontainingtransistorsorintegratedcircuits(ICs)shouldbeconsideredsensitiveto
electrostaticdischarge(ESD).ESDdamagecanoccurwhenthereisadifferenceinchargebetweenobjects.
ProtectagainstESDdamagebyequalizingthechargesothatthemachine,thepart,theworkmat,andthe
personhandlingthepartareallatthesamecharge.
Notes:
1.Useproduct-specicESDprocedureswhentheyexceedtherequirementsnotedhere.
2.EnsurethattheESDprotectivedevicesyouusehavebeencertied(ISO9000)asfullyeffective.
Chapter1.Safetyinformation3

WhenhandlingESD-sensitiveparts:
•Keepthepartsinprotectivepackagesuntiltheyareinsertedintotheproduct.
•Avoidcontactwithotherpeople.
•Wearagroundedwriststrapagainstyourskintoeliminatestaticonyourbody.
•Preventthepartfromtouchingyourclothing.Mostclothingisinsulativeandretainsachargeevenwhen
youarewearingawriststrap.
•Useagroundedworkmattoprovideastatic-freeworksurface.Thematisespeciallyusefulwhen
handlingESD-sensitivedevices.
•Selectagroundingsystem,suchasthoselistedbelow,toprovideprotectionthatmeetsthespecic
servicerequirement.
Note:TheuseofagroundingsystemtoguardagainstESDdamageisdesirablebutnotnecessary.
–AttachtheESDgroundcliptoanyframeground,groundbraid,orgreen-wireground.
–Whenworkingonadouble-insulatedorbattery-operatedsystem,useanESDcommongroundor
referencepoint.Y oucanusecoaxorconnector-outsideshellsonthesesystems.
–Usetheroundgroundprongoftheacplugonac-operatedcomputers.
Groundingrequirements
Electricalgroundingofthecomputerisrequiredforoperatorsafetyandcorrectsystemfunction.Proper
groundingoftheelectricaloutletcanbeveriedbyacertiedelectrician.
Safetynotices
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4HardwareMaintenanceManual

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Chapter1.Safetyinformation5

6HardwareMaintenanceManual

Chapter2.Generalcheckout
Thischapterpresentsfollowinginformation:
•“Whattodorst”onpage7
•“Powersystemcheckout”onpage8
Besuretoreadthefollowingimportantnotes.
Important:
•Onlycertiedtrainedpersonnelshouldservicethecomputer.PersonnelrepairingtheLenovo
ChromebookcomputermusthavecompletedthecerticationcoursenumberRTPW1170or
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.
Whattodorst
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,modication,unsuitablephysicaloroperatingenvironment,orimproper
maintenancebythecustomer.Followingisalistofsomecommonitemsthatarenotcoveredunderwarranty
andsomesymptomsthatmightindicatethatthesystemwassubjecttostressbeyondnormaluse.
Beforecheckingproblemswiththecomputer,determinewhetherthedamageiscoveredunderthewarranty
byreferringtothefollowinglist:
Thefollowingarenotcoveredunderwarranty:
©CopyrightLenovo20137

•LCDpanelcrackedfromtheapplicationofexcessiveforceorfrombeingdropped
•Scratched(cosmetic)parts
•Distortion,deformation,ordiscolorationofthecosmeticparts
•Plasticparts,latches,pins,orconnectorsthathavebeencrackedorbrokenbyexcessiveforce
•Damagecausedbyliquidspilledintothesystem
•DamagecausedbytheimproperinsertionofaPCCardortheinstallationofanincompatiblecard
•Fusesblownbyattachmentofanonsupporteddevice
•Forgottencomputerpassword(makingthecomputerunusable)
•Stickykeyscausedbyspillingaliquidontothekeyboard
•Useofanincorrectacpoweradapteronlaptopproducts
Thefollowingsymptommightindicatedamagecausedbynonwarrantedactivities:
•Missingpartsmightbeasymptomofunauthorizedserviceormodication.
•Checkforobviousdamagetoaharddiskdrive.Ifthespindleofaharddiskdrivebecomesnoisy,thehard
diskdrivemighthavebeendroppedorsubjecttoexcessiveforce.
Powersystemcheckout
Toverifyasymptom,dothefollowing:
1.Turnoffthecomputer.
2.Removethebatterypack.
3.Connecttheacadapter.
4.Checkthatpowerissuppliedwhenyouturnonthecomputer.
5.Turnoffthecomputer.
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.Seethefollowinggure:
PinVoltage(Vdc)
1+20
20
3Ground
1
2
3
(20V)
Note:Outputvoltageacrosspin2oftheacpoweradaptermightdifferfromtheoneyouareservicing.
3.Ifthevoltageisnotcorrect,replacetheacadapter.
4.Ifthevoltageisacceptable,replacethesystemboard.
8HardwareMaintenanceManual

Note:Noisefromtheacadapterdoesnotalwaysindicateadefect.
Checkingoperationalcharging
Tocheckwhetherthebatterypackchargesproperlyduringoperation,dothefollowing:
Note:Beforeyoubegin,installadischargedbatterypackorabatterypackthathaslessthan50%ofthe
totalpowerremaininginthecomputer.
1.Ifthebatterystatusindicatororicondoesnotturnon,removethebatterypackandletitreturn
toroomtemperature.
2.Reinstallthebatterypack.
3.Ifthebatterystatusindicatorstilldoesnotturnon,replacethebatterypack.
4.Ifthebatteryindicatorstilldoesnotturnon,replacethesystemboard.Otherwise,referto“Checking
thebatterypack”onpage9tochecktheoriginalbatterypack.
Checkingthebatterypack
Thebatterystatusindicatorislocatedinthelower-rightcornerofthescreen.Toviewthepercentageof
batterypowerremaining,clickthebatterystatusicon.
Note:Ifthebatterypackbecomeshot,itmaynotbeabletocharge.Removeitfromthecomputerandleave
itatroomtemperatureforawhile.Afteritcoolsdown,reinstallandrechargeit.
Tocheckthebatterypack,dothefollowing:
1.Turnoffthecomputeranddisconnecttheacpoweradapter.
2.Removethebatterypackandmeasurethevoltagebetweenbatteryterminals1(+)and7(-).Seethe
followingtable:
TerminalVoltage(Vdc)
1+0to+12.6
7Ground(-)
1(+)2(+) 3456(-)7(-)
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®CustomerSupportCenteriftheyneedanyassistance.
TelephonenumbersforLenovoSupportareavailableat:
http://www.lenovo.com/support/phone
•SystemdisassemblyandreassemblyvideosthatshowtheFRUremovalorreplacementproceduresfor
theLenovoauthorizedservicetechniciansareavailableat:
http://www.lenovoservicetraining.com/ion/
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
causeislistedrst,inboldfacetype.
©CopyrightLenovo201311

Note:DotheFRUreplacementorotheractionsinthesequenceshowninthecolumnheaded“FRUor
action,insequence.”IfreplacingaFRUdoesnotsolvetheproblem,puttheoriginalpartbackinthe
computer.DonotreplaceanondefectiveFRU.
ThisindexcanalsohelpyoudeterminewhatFRUsneedtobereplacednextduringregularservicing.
LCD-relatedsymptoms
Important:TheTFTLCDforthenotebookcomputercontainsmanythin-lmtransistors(TFTs).The
presenceofasmallnumberofdotsthataremissing,discolored,oralwayslightedischaracteristicofTFT
LCDtechnology,butexcessivepixelproblemscancauseviewingconcerns.IftheLCDyouareservicinghas
twoorlessvisibledefectivepixels,itshouldnotbeconsideredfaulty.However,iftheLCDhasthreeormore
visibledefectivepixels,itwillbedeemedasdefectivebyLenovoanditshouldbereplaced.
Notes:
•ThispolicyappliestoallThinkPadnotebookcomputerspurchasedon1January,2008orlater.
•LenovowillnotprovidewarrantyreplacementiftheLCDiswithinspecicationsbecausewecannot
guaranteethatanyreplacementLCDwillhavezeropixeldefects
•OnepixelconsistsofR,G,Bsub-pixels.
Table1.LCD-relatedsymptoms
SymptomorerrorFRUoraction,insequence
Nobeep,power-onindicatoron,andablankLCDduring
POST.
Systemboard
•LCDbacklightnotworking
•LCDtoodark
•LCDbrightnesscannotbeadjusted.
•LCDcontrastcannotbeadjusted.
1.ReseattheLCDconnectors.
2.LCDassembly
3.Systemboard
•LCDscreenunreadable
•Charactersmissingpixels
•Screenabnormal
•Wrongcolordisplayed
1.Seeimportantnotefor“LCD-relatedsymptoms.”
2.ReseatallLCDconnectors.
3.LCDassembly
4.Systemboard
HorizontalorverticallinesdisplayedonLCDLCDassembly
Intermittentproblems
Intermittentsystemhangproblemscanbeduetoavarietyofcausesthathavenothingtodowithahardware
defect,suchascosmicradiation,electrostaticdischarge,orsoftwareerrors.FRUreplacementshouldbe
consideredonlywhenaproblemrecurs.
Undeterminedproblems
Ifwrongdevicesareinstalled,orifthesystemsimplyisnotoperating,followtheseprocedurestoisolatethe
failingFRU(donotisolateFRUsthathavenodefects).
Verifythatallattacheddevicesaresupportedbythecomputer.
Verifythatthepowersupplybeingusedatthetimeofthefailureisoperatingcorrectly.(See“Powersystem
checkout”onpage8)
1.Turnoffthecomputer.
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.Turnonthecomputer.
5.Determinewhethertheproblemhasbeensolved.
6.Iftheproblemdoesnotrecur,reconnecttheremoveddevicesoneatatimeuntilyoundthefailingFRU.
7.Iftheproblemremains,replacethefollowingFRUsoneatatime(donotreplaceanondefectiveFRU):
a.Systemboard
b.LCDassembly
OverviewoftheChromebookUSBrepairshim
ThissectionprovidesinformationabouttherecoverysolutionontheChromeOSTMoperatingsystemby
usingtheChromebookUSBrepairshim(hereafterreferredtoastherepairshim).
TherepairshimisabootabledevicethatisrequiredtoservicetheChromebookcomputer.Therepair
shimisusedforthefollowingpurposes:
•Diagnoseproblemsandrestorethesystemtothefactorydefaultsettings
•Refreshthesystemwiththelatestrmwareandsoftware
TherepairshimisnotnecessarywhenaCustomerReplaceableUnit(CRU)isreplaced.Ifanon-CRUis
broken,orthereisastrongsuspicionthataparticularnon-CRUisdefective,itcanbereplacedbeforeusing
therepairshim.Otherwise,therepairshimmustbeusedbeforeanynon-CRUisreplaced.
ThefollowingisthelistofCRUsforaChromebookcomputer:
•acpoweradapter
•Batterypack
•Bottomslotcover
•Keyboard
•Memorymodule
•Trackpointcap
ForCRUdenition,see“LocatingFRUsandCRUs”onpage24.
Creatingtherepairshim
LenovoservicetechniciansneedtodownloadtherepairshimimagefromtheLenovoSupportWebsiteto
createarepairshim.ALenovoservicecredentialisrequiredtodownloadtheimage.
Notes:
•Tocreatetherepairshim,aUSBdevicewithatleast4gigabyte(GB)ofstorageisrequired.Therequired
USBstoragecapacitydependsonthesizeoftherecoveryimage.
•Y oumightalsoneedarecoverytooltocreatetherepairshim.Topreventpotentialperformancerisksor
unexpectedfailure,itisrecommendedthatyouusetheWin32DiskImagertocreatetherepairshim.
•Ensurethatyoucreatetherepairshimusingthelatestversionoftherepairshimimage.Ifyouusean
earlierversion,itmightcausetherepairprocesstofail.
Chapter3.Importantserviceinformation13

Tocreatetherepairshim,dothefollowing:
Attention:CreatingtherepairshimwilldeletealldatastoredontheUSBdevice.Toavoiddataloss,makea
backupcopyofallthedatathatyouwanttokeep.
1.DownloadthelatestversionoftherepairshimimagefromtheLenovoSupportWebsiteat:
http://www.lenovo.com/support
2.Extractthedownloadedlethatcontainstherepairshimimage.
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
Chromebookrmware,settheROMsasunprotectedbyippingthewrite-protectswitchonthesystem
board.
Toipthewrite-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.Toturnoffthe
write-protectfunction,ipthewrite-protectswitchtotheleftasshownbythearrowa.Toturnonthe
write-protectfunction,ipthewrite-protectswitchtotherightasshownbythearrowb.
14HardwareMaintenanceManual