Lenovo ThinkPad T420, ThinkPad T420i Hardware Maintenance Manual

ThinkPadT420andT420i
HardwareMaintenanceManual

Note:Beforeusingthisinformationandtheproductitsupports,besuretoreadthegeneralinformation
underAppendixA“Notices”onpage175.

FifthEdition(March2012)

©CopyrightLenovo2012.

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

Contents

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

Chapter1.Safetyinformation......1

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

Electricalsafety...............2

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

Handlingdevicesthataresensitivetoelectrostatic

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

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

Safetynotices(multilingualtranslations)......5

Lasercompliancestatement(multilingual

translations)................17

Chapter2.Importantservice

information..............23

StrategyforreplacingFRUs.........23

Strategyforreplacingaharddiskdrive...23
Importantnoticeforreplacingasystem

board................24

Howtouseerrormessage........24

StrategyforreplacingFRUsforCTO,CMV ,and

GAV...................25

Productdenition............25

FRUidenticationforCTO,CMV ,andGAV

products...............25

Chapter3.Generalcheckout.....27

Whattodorst..............28

Checkoutguide..............29

SystemsupportingtheLenovoThinkVantage
ToolboxprogramandthePC-DoctorforDOS

diagnosticsprogram..........29

SystemsupportingtheLenovodiagnostics

programs...............33

Powersystemcheckout...........37

Checkingtheacpoweradapter......37

Checkingoperationalcharging......37

Checkingthebatterypack........38

Checkingthebackupbattery.......38

Chapter4.Relatedservice

information..............41

RestoringthefactorycontentsbyusingRecovery

DiscSet.................41

Passwords................42

Power-onpassword...........42

Hard-diskpassword...........42

Supervisorpassword..........43

Howtoremovethepower-onpassword...43

Howtoremovethehard-diskpassword...43

Powermanagement............45

Screenblankmode...........45

Sleep(standby)mode..........45

Hibernationmode...........45

Symptom-to-FRUindex...........47

Numericerrorcodes..........47

Errormessages............49

Beepsymptoms............50

No-beepsymptoms...........50

LCD-relatedsymptoms.........50

Intermittentproblems..........52

Undeterminedproblems.........52

Chapter5.Statusindicators.....53

Chapter6.Fnkeycombinations...57

Chapter7.FRUreplacement

notices................61

Screwnotices...............61

Retainingserialnumbers...........62

Restoringtheserialnumberofthesystem

unit.................62

RetainingtheUUID...........63

ReadingorwritingtheECAinformation...63

Chapter8.Removingandreplacinga

FRU..................65

BeforeservicingThinkPadT420andT420i...66

1010Batterypack.............67

1020ExpressCardblankbezel........68

1030SerialUltrabayEnhanceddeviceortravel

bezel..................69

1040Harddiskdrive(HDD)andsolidstatedrive

(SSD)..................70

1050DIMMslotcover............73

1060DIMM(intheslotontheundersideofthe

computer)................74

1070PCIExpressMiniCardforwirelessWAN..75

1080Keyboard..............77

1090DIMM(intheslotunderthekeyboard)...81

1100Backupbattery............83

1110PCIExpressMiniCardforwirelessLAN..85
1120Keyboardbezelassembly,FPCcable,and

Bluethoothdaughtercard..........87

1130SmartCard..............92

1140Modemdaughtercard(MDC).......94

©CopyrightLenovo2012

i

1150Speakerassembly...........95

1160LCDunit...............97

1170Fanassembly.............101

1180CPU................105

1190BasecoverassemblyandDC-inconnector

cable..................106

1200Magnesiumstructureframe.......110

1210SystemboardandExpressCardslot

assembly.................112

1220mSATAsolidstatedrive.........114

2010LCDbezelassembly..........116

2020LEDboard..............117

2030Integratedcamera...........119

2040LCDpanelandLCDcable........121

2050Cameracable.............123

2060WirelessLANantennaassemblyorwireless

LAN/WANantennaassembly.........124

2070HingesandLCDrearcoverassembly...126

Chapter9.Locations........129

Frontview................129

Rearview.................131

Bottomview...............132

Chapter10.Partslist........133

Overall..................134

LCDFRUs................155

Keyboard.................160

Miscellaneousparts............162

Informationaboutacpoweradapters......164

Powercords...............165

Recoverydiscs..............166

Commonservicetools...........173

AppendixA.Notices.........175

Electronicemissionsnotices.........176

Trademarks................177

iiThinkPadT420andT420iHardwareMaintenanceManual

Aboutthismanual

ThismanualcontainsserviceandreferenceinformationforthefollowingThinkPad

®

products.

ThinkPadT420andT420iMachineType4177,4178,4179,4180,4236,4237,and4238

Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems.

Important:

ThismanualisintendedonlyfortrainedservicetechnicianswhoarefamiliarwithThinkPadproducts.Usethis
manualalongwiththeadvanceddiagnosticteststotroubleshootproblemseffectively.
BeforeservicingaThinkPadproduct,besuretoreadalltheinformationunderChapter1“Safetyinformation”on
page1andChapter2“Importantserviceinformation”onpage23.

©CopyrightLenovo2012

iii

ivThinkPadT420andT420iHardwareMaintenanceManual

Chapter1.Safetyinformation

Thischapterpresentsfollowingsafetyinformationthatyouneedtobefamiliarwithbeforeyouservice
aThinkPadNotebook.

•“Generalsafety”onpage1

•“Electricalsafety”onpage2

•“Safetyinspectionguide”onpage3

•“Handlingdevicesthataresensitivetoelectrostaticdischarge”onpage3

•“Groundingrequirements”onpage4

•“Safetynotices(multilingualtranslations)”onpage5

•“Lasercompliancestatement(multilingualtranslations)”onpage17

Generalsafety

Followtheserulestoensuregeneralsafety:

•Observegoodhousekeepingintheareaofthemachinesduringandaftermaintenance.

•Whenliftinganyheavyobject:

1.Makesurethatyoucanstandsafelywithoutslipping.

2.Distributetheweightoftheobjectequallybetweenyourfeet.

3.Useaslowliftingforce.Nevermovesuddenlyortwistwhenyouattempttolift.

4.Liftbystandingorbypushingupwithyourlegmuscles;thisactionremovesthestrainfromthe
musclesinyourback.Donotattempttoliftanyobjectthatweighsmorethan16kg(35lb)orthat

youthinkistooheavyforyou.

•Donotperformanyactionthatcauseshazardstothecustomer,orthatmakestheequipmentunsafe.

•Beforeyoustartthemachine,makesurethatotherservicetechniciansandthecustomer'spersonnelare
notinahazardousposition.

•Placeremovedcoversandotherpartsinasafeplace,awayfromallpersonnel,whileyouareservicing
themachine.

•Keepyourtoolcaseawayfromwalkareassothatotherpeoplewillnottripoverit.

•Donotwearlooseclothingthatcanbetrappedinthemovingpartsofamachine.Makesurethatyour
sleevesarefastenedorrolledupaboveyourelbows.Ifyourhairislong,fastenit.

•Inserttheendsofyournecktieorscarfinsideclothingorfastenitwithanonconductiveclip,about8
centimeters(3inches)fromtheend.

•Donotwearjewelry,chains,metal-frameeyeglasses,ormetalfastenersforyourclothing.

Attention:Metalobjectsaregoodelectricalconductors.

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

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

•Reinstallallcoverscorrectlybeforereturningthemachinetothecustomer.

•Fanlouversonthemachinehelptopreventoverheatingofinternalcomponents.Donotobstructfan
louversorcoverthemwithlabelsorstickers.

©CopyrightLenovo2012

1

Electricalsafety

Observethefollowingruleswhenworkingonelectricalequipment.

Important:

Useonlyapprovedtoolsandtestequipment.Somehandtoolshavehandlescoveredwithasoftmaterialthatdoes
notinsulateyouwhenworkingwithliveelectricalcurrents.
Manycustomershave,neartheirequipment,rubberoormatsthatcontainsmallconductiveberstodecrease
electrostaticdischarges.Donotusethistypeofmattoprotectyourselffromelectricalshock.

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

•Donotworkaloneunderhazardousconditionsornearequipmentthathashazardousvoltages.

•Disconnectallpowerbefore:
–Performingamechanicalinspection
–Workingnearpowersupplies
–Removingorinstallingmainunits

•Beforeyoustarttoworkonthemachine,unplugthepowercord.Ifyoucannotunplugit,askthecustomer
topower-offthewallboxthatsuppliespowertothemachine,andtolockthewallboxintheoffposition.

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

Attention:Anotherpersonmustbetheretoswitchoffthepower,ifnecessary.

–Useonlyonehandwhenworkingwithpowered-onelectricalequipment;keeptheotherhandinyour

pocketorbehindyourback.

Attention: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.

•Donotservicethefollowingpartswiththepoweronwhentheyareremovedfromtheirnormaloperating
placesinamachine:
–Powersupplyunits
–Pumps
–Blowersandfans
–Motorgenerators
–Similarunitstolistedabove
Thispracticeensurescorrectgroundingoftheunits.

•Ifanelectricalaccidentoccurs:

2ThinkPadT420andT420iHardwareMaintenanceManual

–Usecaution;donotbecomeavictimyourself.
–Switchoffpower.
–Sendanotherpersontogetmedicalaid.

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.Poweroffthecomputer.Disconnectthepowercord.

3.Checkthepowercordfor:

a.Athird-wiregroundconnectoringoodcondition.Useametertomeasurethird-wireground

continuityfor0.1ohmorlessbetweentheexternalgroundpinandtheframeground.

b.Thepowercordshouldbethetypespeciedinthepartslist.

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.

Chapter1.Safetyinformation3

Notes:

1.Useproduct-specicESDprocedureswhentheyexceedtherequirementsnotedhere.

2.MakesurethattheESDprotectivedevicesyouusehavebeencertied(ISO9000)asfullyeffective.

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.

4ThinkPadT420andT420iHardwareMaintenanceManual

Safetynotices(multilingualtranslations)

Thesafetynoticesinthissectionareprovidedinthefollowinglanguages:

•English

•Arabic

•BrazilianPortuguese

•French

•German

•Hebrew

•Japanese

•Korean

•Spanish

•T raditionalChinese

DANGER

BeforethecomputerispoweredonafterFRUreplacement,makesureallscrews,springs,andothersmall
partsareinplaceandarenotleftlooseinsidethecomputer.Verifythisbyshakingthecomputerandlistening
forrattlingsounds.Metallicpartsormetalakescancauseelectricalshorts.

DANGER

Somestandbybatteriescontainasmallamountofnickelandcadmium.Donotdisassembleastandbybattery,
rechargeit,throwitintoreorwater,orshort-circuitit.Disposeofthebatteryasrequiredbylocalordinances
orregulations.Useonlythebatteryintheappropriatepartslisting.Useofanincorrectbatterycanresult
inignitionorexplosionofthebattery.

DANGER

Thebatterypackcontainssmallamountsofnickel.Donotdisassembleit,throwitintoreorwater ,or
short-circuitit.Disposeofthebatterypackasrequiredbylocalordinancesorregulations.Useonlythe
batteryintheappropriatepartslistingwhenreplacingthebatterypack.Useofanincorrectbatterycanresult
inignitionorexplosionofthebattery.

DANGER

Thelithiumbatterycancauseare,anexplosion,orasevereburn.Donotrechargeit,removeitspolarized
connector,disassembleit,heatitabove100°C(212°F),incinerateit,orexposeitscellcontentstowater.
Disposeofthebatteryasrequiredbylocalordinancesorregulations.Useonlythebatteryintheappropriate
partslisting.Useofanincorrectbatterycanresultinignitionorexplosionofthebattery.

Chapter1.Safetyinformation5

DANGER

IftheLCDbreaksandtheuidfrominsidetheLCDgetsintoyoureyesoronyourhands,immediatelywash
theaffectedareaswithwaterforatleast15minutes.Seekmedicalcareifanysymptomsfromtheuidare
presentafterwashing.

DANGER

Toavoidshock,donotremovetheplasticcoverthatprotectsthelowerpartoftheinvertercard.

DANGER

Thoughthemainbatterieshavelowvoltage,ashortedorgroundedbatterycanproduceenoughcurrentto
burnpersonnelorcombustiblematerials.

DANGER

UnlesshotswapisallowedfortheFRUbeingreplaced,doasfollowsbeforeremovingit:poweroffthe
computer,unplugallpowercordsfromelectricaloutlets,removethebatterypack,anddisconnectany
interconnectingcables.

6ThinkPadT420andT420iHardwareMaintenanceManual

PERIGO

Chapter1.Safetyinformation7

AntesdeligarocomputadorapósasubstituiçãodaFRU,certique-sedequetodososparafusos,molase
outraspeçaspequenasestejamnolugarenãoestejamsoltosdentrodocomputador.Veriqueissosacudindo
ocomputadoreprocurandoouvirsonsdepeçassoltas.Peçasmetálicasoulascasdemetalpodemcausar
curto-circuito.

PERIGO

Algumasbateriasreservacontêmumapequenaquantidadedeníquelecádmio.Nãodesmonteumabateria
reserva,recarregue-a,jogue-anofogoounaágua,oudeixe-aentraremcurto-circuito.Descarteabateria
conformerequeridopelasleisouregulamentoslocais.Usesomenteabaterianasparteslistadasapropriadas.
Ousodeumabateriaincorretapoderesultaremcombustãoouexplosãodabateria.

PERIGO

Opacotedabateriacontémumapequenaquantidadedeníquel.Nãoodesmonte,jogue-onofogoouna
água,oudeixe-oentraremcurto-circuito.Descarteopacotedabateriaconformerequeridopelasleisou
regulamentoslocais.Usesomenteabaterianasparteslistadasapropriadasaosubstituiropacotedabateria.
Ousodeumabateriaincorretapoderesultaremcombustãoouexplosãodabateria.

PERIGO

Abateriadelítiopodecausarincêndio,explosãoougravesqueimaduras.Nãoarecarregue,removaseu
conectorpolarizado,desmonte-a,aqueça-aacimade100°C(212°F),incinere-a,ouexponhaoconteúdode
suacélulaàágua.Descarteabateriaconformerequeridopelasleisouregulamentoslocais.Usesomente
abaterianasparteslistadasapropriadas.Ousodeumabateriaincorretapoderesultaremcombustão
ouexplosãodabateria.

PERIGO

SeoLCDquebrareouidodedentrodeleentraremcontatocomseusolhosoucomsuasmãos,laveas
áreasafetadasimediatamentecomáguadurantepelomenos15minutos.Procurecuidadosmédicossealgum
sintomacausadopelouidosurgirapósalavagem.

PERIGO

Paraevitarchoqueelétrico,nãoremovaacapaplásticaqueprotegeaparteinferiordaplacainversora.

PERIGO

8ThinkPadT420andT420iHardwareMaintenanceManual

Emboraasprincipaisbateriaspossuambaixavoltagem,umabateriaemcurto-circuitoouaterradapode
produzircorrenteobastanteparaqueimarmateriaisdepessoalouinamáveis.

PERIGO

AmenosqueumahotswapsejapermitidaparaaFRUqueestásendosubstituída,façaoseguinteantesde
removê-la:desligueocomputador,desconectetodososcabosdeenergiadastomadas,removaopacotede
bateriasedesconectequaisquercabosdeinterconexão.

DANGER

Avantderemettrel'ordinateursoustensionaprèsremplacementd'uneunitéenclientèle,vériezquetousles
ressorts,visetautrespiècessontbienenplaceetbienxées.Pourcefaire,secouezl'unitéetassurez-vous
qu'aucunbruitsuspectneseproduit.Despiècesmétalliquesoudescopeauxdemétalpourraientcauser
uncourt-circuit.

DANGER

Certainesbatteriesdesecourscontiennentdunickeletducadmium.Nelesdémontezpas,nelesrechargez
pas,nelesexposezniaufeuniàl'eau.Nelesmettezpasencourt-circuit.Pourlesmettreaurebut,
conformez-vousàlaréglementationenvigueur.Lorsquevousremplacezlapiledesauvegardeoucellede
l'horlogetempsréel,veillezàn'utiliserquelesmodèlescitésdanslalistedepiècesdétachéesadéquate.Une
batterieouunepileinappropriéerisquedeprendrefeuoud'exploser.

DANGER

Labatteriecontientdunickel.Neladémontezpas,nel'exposezniaufeuniàl'eau.Nelamettezpasen
court-circuit.Pourlamettreaurebut,conformez-vousàlaréglementationenvigueur.Lorsquevousremplacez
labatterie,veillezàn'utiliserquelesmodèlescitésdanslalistedepiècesdétachéesadéquate.Eneffet,une
batterieinappropriéerisquedeprendrefeuoud'exploser.

DANGER

Lapiledesauvegardecontientdulithium.Elleprésentedesrisquesd'incendie,d'explosionoudebrûlures
graves.Nelarechargezpas,neretirezpassonconnecteurpolariséetneladémontezpas.Nel'exposezpasà
unetemperaturesupérieureà100°C,nelafaitespasbrûleretn'enexposezpaslecontenuàl'eau.Mettezla
pileaurebutconformémentàlaréglementationenvigueur.Unepileinappropriéerisquedeprendrefeuou
d'exploser.

Chapter1.Safetyinformation9

DANGER

Silepanneaud'afchageàcristauxliquidessebriseetquevousrecevezdanslesyeuxousurlesmainsune
partieduuide,rincez-lesabondammentpendantaumoinsquinzeminutes.Consultezunmédecinsides
symptômespersistentaprèslelavage.

DANGER

And'évitertoutrisquedechocélectrique,neretirezpaslecacheenplastiqueprotégeantlapartieinférieure
delacarted'alimentation.

DANGER

Bienquelevoltagedesbatteriesprincipalessoitpeuélevé,lecourt-circuitoulamiseàlamassed'une
batteriepeutproduiresufsammentdecourantpourbrûlerdesmatériauxcombustiblesoucauserdes
brûlurescorporellesgraves.

DANGER

Sileremplacementàchaudn'estpasautorisépourl'unitéremplaçablesursitequevousremplacez,
procédezcommesuitavantderetirerl'unité:mettezl'ordinateurhorstension,débrancheztousles
cordonsd'alimentationdesprisesdecourant,retirezleblocdebatterieetdéconnecteztouslescâbles
d'interconnexion.

VORSICHT

BevornacheinemFRU-AustauschderComputerwiederangeschlossenwird,mußsichergestelltwerden,daß
keineSchrauben,FedernoderandereKleinteilefehlenoderimGehäusevergessenwurden.DerComputermuß
geschütteltundaufKlappergeräuschegeprüftwerden.Metallteileoder-splitterkönnenKurzschlüsseerzeugen.

VORSICHT

DieBereitschaftsbatterie,diesichunterdemDiskettenlaufwerkbendet,kanngeringeMengenNickel
undCadmiumenthalten.SiedarfnurdurchdieVerkaufsstelleoderdenIBMKundendienstausgetauscht
werden.Siedarfnichtzerlegt,wiederaufgeladen,kurzgeschlossen,oderFeueroderWasserausgesetzt
werden.DieBatteriekannschwereVerbrennungenoderVerätzungenverursachen.BeiderEntsorgungdie
örtlichenBestimmungenfürSondermüllbeachten.BeimErsetzenderBereitschafts-oderSystembatterienur
BatteriendesTypsverwenden,derinderErsatzteillisteaufgeführtist.DerEinsatzfalscherBatterienkann
zuEntzündungoderExplosionführen.

10ThinkPadT420andT420iHardwareMaintenanceManual

VORSICHT

AkkusenthaltengeringeMengenvonNickel.Siedürfennichtzerlegt,wiederaufgeladen,kurzgeschlossen,
oderFeueroderWasserausgesetztwerden.BeiderEntsorgungdieörtlichenBestimmungenfürSondermüll
beachten.BeimErsetzenderBatterienurBatteriendesT ypsverwenden,derinderErsatzteillisteaufgeführt
ist.DerEinsatzfalscherBatterienkannzuEntzündungoderExplosionführen.

VORSICHT

DieSystembatterieisteineLithiumbatterie.Siekannsichentzünden,explodierenoderschwereVerbrennungen
hervorrufen.BatteriendiesesT ypsdürfennichtaufgeladen,zerlegt,über100°Cerhitztoderverbranntwerden.
AuchdarfihrInhaltnichtmitWasserinVerbindunggebrachtoderderzurrichtigenPolungangebrachte
Verbindungssteckerentferntwerden.BeiderEntsorgungdieörtlichenBestimmungenfürSondermüll
beachten.BeimErsetzenderBatterienurBatteriendesT ypsverwenden,derinderErsatzteillisteaufgeführt
ist.DerEinsatzfalscherBatterienkannzuEntzündungoderExplosionführen.

VORSICHT

DieLeuchtstoffröhreimLCD-BildschirmenthältQuecksilber .BeiderEntsorgungdieörtlichenBestimmungen
fürSondermüllbeachten.DerLCD-BildschirmbestehtausGlasundkannzerbrechen,wennerunsachgemäß
behandeltwirdoderderComputeraufdenBodenfällt.WennderBildschirmbeschädigtistunddiedarin
bendlicheFlüssigkeitinKontaktmitHautundAugengerät,solltendiebetroffenenStellenmindestens15
MinutenmitWasserabgespültundbeiBeschwerdenanschließendeinArztaufgesuchtwerden.

VORSICHT

AusSicherheitsgründendieKunststoffabdeckung,diedenunterenT eilderSpannungswandlerplatineumgibt,
nichtentfernen.

VORSICHT

ObwohlHauptbatterieneineniedrigeSpannunghaben,könnensiedochbeiKurzschlußoderErdunggenug
Stromabgeben,umbrennbareMaterialienzuentzündenoderVerletzungenbeiPersonenhervorzurufen.

VORSICHT

Chapter1.Safetyinformation11

WenneinAustauschderFRUbeilaufendemBetriebnichterlaubtist,gehenSiebeimAustauschderFRUwie
folgtvor:SchaltenSiedenComputeraus,ziehenSiealleNetzkabelvondenNetzsteckdosenab,entfernen
SiedenAkkuundziehenSieallemiteinanderverbundenenKabelab.

12ThinkPadT420andT420iHardwareMaintenanceManual

Chapter1.Safetyinformation13

14ThinkPadT420andT420iHardwareMaintenanceManual

AntesdeencenderelsistemadespuesdesustituirunaFRU,compruebequetodoslostornillos,muellesy
demáspiezaspequeñasseencuentranensusitioynoseencuentransueltasdentrodelsistema.Compruébelo
agitandoelsistemayescuchandolosposiblesruidosqueprovocarían.Laspiezasmetálicaspuedencausar
cortocircuitoseléctricos.

Algunasbateríasdereservacontienenunapequeñacantidaddeníquelycadmio.Nolasdesmonte,ni
recargue,nilasechealfuegooalaguanilascortocircuite.Deséchelastalcomodisponelanormativalocal.
Utilicesólobateríasqueseencuentrenenlalistadepiezas.Lautilizacióndeunabateríanoapropiada
puedeprovocarlaigniciónoexplosióndelamisma.

Lasbateríascontienenpequeñascantidadesdeníquel.Nolasdesmonte,nirecargue,nilasechealfuego
oalaguanilascortocircuite.Deséchelastalcomodisponelanormativalocal.Utilicesólobateríasquese
encuentrenenlalistadepiezasalsustituirlabatería.Lautilizacióndeunabateríanoapropiadapuede
provocarlaigniciónoexplosióndelamisma.

Labateríaderepuestoesunabateríadelitioypuedeprovocarincendios,explosionesoquemadurasgraves.
Nolarecargue,niquiteelconectorpolarizado,niladesmonte,nicalienteporencimadelos100°C(212°F),ni
laincinereniexpongaelcontenidodesusceldasalagua.Deséchelatalcomodisponelanormativalocal.

SilaLCDserompeyeluidodesuinteriorentraencontactoconsusojososusmanos,laveinmediatamente
lasáreasafectadasconaguadurante15minutoscomomínimo.Obtengaatenciónmedicasisepresenta
algúnsíntomadeluidodespuesdelavarse.

Chapter1.Safetyinformation15

Paraevitardescargas,noquitelacubiertadeplásticoquerodealapartebajadelatarjetainvertida.

Aunquelasbateríasprincipalestienenunvoltajebajo,unabateríacortocircuitadaoconcontactoatierra
puedeproducirlacorrientesucientecomoparaquemarmaterialcombustibleoprovocarquemadurasen
elpersonal.

Salvoquesepermitaelintercambioencalienteparalaunidadsustituiblelocalmente,realicelosiguienteantes
deextraerla:apagueelsistema,desconectetodosloscablesdealimentacióndelastomasdealimentación
eléctrica,extraigalabateríaydesconecteloscablesdeinterconexión.

16ThinkPadT420andT420iHardwareMaintenanceManual

Lasercompliancestatement(multilingualtranslations)

Thelasercompliancestatementsinthissectionareprovidedinthefollowinglanguages:

•English

•Arabic

•BrazilianPortuguese

•French

•German

•Hebrew

•Japanese

•Korean

•Spanish

•T raditionalChinese

Chapter1.Safetyinformation17

18ThinkPadT420andT420iHardwareMaintenanceManual

Chapter1.Safetyinformation19

20ThinkPadT420andT420iHardwareMaintenanceManual

Chapter1.Safetyinformation21

22ThinkPadT420andT420iHardwareMaintenanceManual

Chapter2.Importantserviceinformation

Thischapterpresentsfollowingimportantserviceinformationthatappliestoallmachinetypessupportedby
thismanual:

•“StrategyforreplacingFRUs”onpage23
–“Strategyforreplacingaharddiskdrive”onpage23
–“Importantnoticeforreplacingasystemboard”onpage24
–“Howtouseerrormessage”onpage24

•“StrategyforreplacingFRUsforCTO,CMV,andGAV”onpage25
–“Productdenition”onpage25
–“FRUidenticationforCTO,CMV ,andGAVproducts”onpage25

Important:

AdvisecustomerstocontacttheLenovoCustomerSupportCenteriftheyneedanyassistanceinobtainingor
installinganysoftwarexes,drivers,andUEFIBIOSdownloads.TelephonenumbersforLenovoSupportare
availableathttp://www.lenovo.com/support.
SystemDisassembly/ReassemblyvideosthatshowtheFRUremovalsorreplacementsfortheLenovo
servicetechniciansareavailableinthefollowingsupportsite:
http://www.lenovoservicetraining.com/ion/

StrategyforreplacingFRUs

Beforereplacingparts:

Makesurethatallsoftwarexes,drivers,andUEFIBIOSdownloadsareinstalledbeforereplacingany
FRUslistedinthismanual.

®

authorized

Afterasystemboardisreplaced,ensurethatthelatestUEFIBIOSisloadedtothesystemboardbefore
completingtheserviceaction.

Todownloadsoftwarexes,drivers,andUEFIBIOS,gotohttp://www.lenovo.com/supportandclick
DownloadDrivers&Software.Thenfollowtheinstructionsonthescreentoinstallthenecessarysoftware.

UsethefollowingstrategytopreventunnecessaryexpenseforreplacingandservicingFRUs:

•IfyouareinstructedtoreplaceaFRUbutthereplacementdoesnotcorrecttheproblem,reinstall
theoriginalFRUbeforeyoucontinue.

•Somecomputershavebothaprocessorboardandasystemboard.Ifyouareinstructedtoreplaceeither
theprocessorboardorthesystemboard,andreplacingoneofthemdoesnotcorrecttheproblem,
reinstallthatboard,andthenreplacetheotherone.

•IfanadapteroradeviceconsistsofmorethanoneFRU,anyoftheFRUsmaybethecauseoftheerror.
Beforereplacingtheadapterordevice,removetheFRUs,onebyone,toseeifthesymptomschange.
ReplaceonlytheFRUthatchangedthesymptoms.

Attention:Thesetupcongurationonthecomputeryouareservicingmayhavebeencustomized.Running
AutomaticCongurationmayalterthesettings.Notethecurrentcongurationsettings(usingtheView
Congurationoption);then,whenservicehasbeencompleted,verifythatthosesettingsremainineffect.

Strategyforreplacingaharddiskdrive

Alwaystrytorunalow-levelformatbeforereplacingaharddiskdrive.Thiswillcauseallcustomerdataon
theharddisktobelost.Besurethatthecustomerhasacurrentbackupofthedatabeforedoingthistask.

©CopyrightLenovo2012

23

Attention:Thedrivestartupsequenceinthecomputeryouareservicingmayhavebeenchanged.Be

extremelycarefulduringwriteoperationssuchascopying,saving,orformatting.Ifyouselectanincorrect
drive,dataorprogramscanbeoverwritten.

IfyourcomputerisshippedwithanmSATAdriveandasolidstatedriveorharddiskdrive,themSA T Adrive
willbeseenasharddisk0inthesystem,andassigneddriveC:.Thesolidstatedriveorharddiskdrivewill
beseenasharddisk1,andassigneddriveD:.ThemSATAdriveisinstalledinthewirelessWANcardslotof
thecomputer.TheLenovopreloadedsoftwareisinstalledonthemSATAdrive.

Alwaystrytorunalow-levelformatbeforereplacingaharddiskdrive.Thiswillcauseallcustomerdataon
theharddisktobelost.Besurethatthecustomerhasacurrentbackupofthedatabeforedoingthistask.

Attention:Thedrivestartupsequenceinthecomputeryouareservicingmayhavebeenchanged.Be
extremelycarefulduringwriteoperationssuchascopying,saving,orformatting.Ifyouselectanincorrect
drive,dataorprogramscanbeoverwritten.

Importantnoticeforreplacingasystemboard

Somecomponentsmountedonasystemboardareverysensitive.Improperhandlingofasystemboardcan
causedamagetothosecomponents,andmaycauseasystemmalfunction.

Attention:Whenhandlingasystemboard:

•Donotdropasystemboardorapplyanyexcessiveforcetoit.

•Avoidroughhandlingofanykind.

•AvoidbendingasystemboardandhardpushingtopreventcrackingateachBGA(BallGridArray)chipset.

Howtouseerrormessage

Usetheerrorcodesdisplayedonthescreentodiagnosefailures.Ifmorethanoneerrorcodeisdisplayed,
beginthediagnosiswiththersterrorcode.Whatevercausesthersterrorcodemayalsocausefalseerror
codes.Ifnoerrorcodeisdisplayed,seewhethertheerrorsymptomislistedintheSymptom-to-FRU
Indexforthecomputeryouareservicing.

24ThinkPadT420andT420iHardwareMaintenanceManual