ThinkPad T420s Owner's manual

HardwareMaintenanceManual
ThinkPadT420sandT420si

Note
Beforeusingthisinformationandtheproductitsupports,besuretoreadthegeneralinformationunder
AppendixANotices”onpage143.
EighthEdition(November2013)
©CopyrightLenovo2011,2013.
LIMITEDNDRESTRICTEDRIGHTSNOTICE:IfdataorsoftwareisdeliveredpursuantaGeneralServices
dministration“GS”contract,use,reproduction,ordisclosureissubjecttorestrictionssetforthinContract
No.GS-35F-05925.

Contents
boutthismanual...........iii
Chapter1.Safetyinformation......1
Generalsafety................1
Electricalsafety...............2
Safetyinspectionguide............3
Handlingdevicesthataresensitivetoelectrostatic
discharge..................3
Groundingrequirements............4
Safetynotices(multilingualtranslations)......4
Lasercompliancestatement(multilingual
translations)................24
Chapter2.Importantservice
information..............31
StrategyforreplacingFRUs.........31
Strategyforreplacingaharddiskdrive...32
Importantnoticeforreplacingasystem
board................32
Howtouseerrormessage........32
StrategyforreplacingFRUsforCTO,CMV,and
GAV...................32
Productdefinition............32
FRUidentificationforCTO,CMV,andGAV
products...............33
Chapter3.Generalcheckout.....35
Whattodofirst..............35
Checkoutguide..............36
SystemsupportingtheLenovoThinkVantage
ToolboxprogramandthePC-DoctorforDOS
diagnosticsprogram..........36
SystemsupportingtheLenovodiagnostics
programs...............40
Powersystemcheckout...........42
Checkingtheacpoweradapter......43
Checkingoperationalcharging......44
Checkingthebatterypack........44
Checkingthebackupbattery.......44
Chapter4.Relatedservice
information..............47
RestoringthefactorycontentsbyusingProduct
Recoverydiscs..............47
RestoringthefactorycontentsbyusingRecovery
DiscSet.................47
Passwords................49
Power-onpassword...........49
Harddiskpassword...........49
Supervisorpassword..........49
Howtoremovethepower-onpassword...49
Howtoremovetheharddiskpassword...50
Powermanagement............50
Screenblankmode...........50
Sleep(standby)mode..........51
Hibernationmode...........51
Symptom-to-FRUindex...........52
Numericerrorcodes..........53
Errormessages............54
Beepsymptoms............54
No-beepsymptoms...........55
LCD-relatedsymptoms.........55
Intermittentproblems..........56
Undeterminedproblems.........56
Chapter5.Statusindicators.....57
Chapter6.Fnkeycombinations...61
Chapter7.FRUreplacement
notices................63
Screwnotices...............63
Retainingserialnumbers...........64
Restoringtheserialnumberofthesystem
unit.................64
RetainingtheUUID...........65
ReadingorwritingtheECAinformation...65
Chapter8.Removingandreplacinga
FRU..................67
BeforeservicingThinkPadT420sandT420si
models..................67
1010Batterypack.............68
1020SerialUltrabaySlimdeviceortravelbezel..69
1030Solid-statedrive(SSD)orharddiskdrive
(HDD)..................70
1040DIMM................72
1050PCIExpressMiniCardforwirelessLAN..74
1060PCIExpressMiniCardforwirelessWAN..77
10704–in–1mediacardreader........79
1080Keyboard..............80
1090Backupbattery............83
1100Palmrestwithfingerprintreader,smartcard
reader,andspeaker.............84
1110LCDunit...............88
1120DC-insubcard............90
1130Bluetoothdaughtercard(BDC-3.0)....91
©CopyrightLenovo2011,2013i

1140Bluetooth-wirelessradioswitchFPC....91
1150Systemboard,fanassembly,34-mm
ExpressCardreader,andbasecover......93
1160mSATA...............99
2010LCDbezelassembly..........101
2020LCDpanel..............102
2030Integratedcamera,microphone,orhall
sensorcard................104
2040LEDsubcard.............106
2050LCDcable..............107
2060Hingekit...............108
2070LEDcable..............110
2080AntennakitandLCDrearcoverassembly..111
Chapter9.Locations........115
Frontview................115
Rearview.................116
Bottomview...............116
Chapter10.Partslist........117
Overall..................118
LCDFRUs................128
Keyboard.................132
Miscellaneousparts............133
acpoweradapter.............134
Powercords...............134
Recoverydiscs..............135
WindowsXPProfessional(32bit)DVDs...135
WindowsVistaHomeBasic(32bit)DVDs..136
WindowsVistaBusiness(32bit)DVDs...136
Windows7HomeBasic(32bit)DVDs....137
Windows7HomeBasic(64bit)DVDs....137
Windows7Ultimate(32bit)DVDs.....138
Windows7Ultimate(64bit)DVDs.....138
Windows7HomePremium(32bit)DVDs..138
Windows7HomePremium(64bit)DVDs..139
Windows7Professional(32bit)DVDs....139
Windows7Professional(64bit)DVDs....140
Windows7Professional(32bit)RapidBoot
DVDs................141
Commonservicetools...........142
ppendix.Notices.........143
Electronicemissionsnotices.........144
Trademarks................144
iiHardwareMaintenanceManual

boutthismanual
ThismanualcontainsserviceandreferenceinformationforthefollowingThinkPad®products.
ThinkPadT420sandT420siMachinetypes(MT)4170,4171,4172,4173,4174,4175,and4176
Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems.
Important:ThismanualisintendedonlyfortrainedservicetechnicianswhoarefamiliarwithThinkPad
products.Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems
effectively.BeforeservicingaThinkPadproduct,besuretoreadalltheinformationunderChapter1Safety
information”onpage1andChapter2Importantserviceinformation”onpage31.
©CopyrightLenovo2011,2013iii

ivHardwareMaintenanceManual

Chapter1.Safetyinformation
Thischapterpresentsfollowingsafetyinformationthatyouneedtobefamiliarwithbeforeyouservice
aThinkPadNotebook.
•Generalsafety”onpage1
•Electricalsafety”onpage2
•Safetyinspectionguide”onpage3
•Handlingdevicesthataresensitivetoelectrostaticdischarge”onpage3
•Groundingrequirements”onpage4
•Safetynotices(multilingualtranslations)”onpage4
•Lasercompliancestatement(multilingualtranslations)”onpage24
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.
ttention:Metalobjectsaregoodelectricalconductors.
•Wearsafetyglasseswhenyouarehammering,drilling,soldering,cuttingwire,attachingsprings,using
solvents,orworkinginanyotherconditionsthatmightbehazardoustoyoureyes.
•Afterservice,reinstallallsafetyshields,guards,labels,andgroundwires.Replaceanysafetydevice
thatiswornordefective.
•Reinstallallcoverscorrectlybeforereturningthemachinetothecustomer.
•Fanlouversonthemachinehelptopreventoverheatingofinternalcomponents.Donotobstructfan
louversorcoverthemwithlabelsorstickers.
©CopyrightLenovo2011,20131

Electricalsafety
Observethefollowingruleswhenworkingonelectricalequipment.
Important:Useonlyapprovedtoolsandtestequipment.Somehandtoolshavehandlescoveredwithasoft
materialthatdoesnotinsulateyouwhenworkingwithliveelectricalcurrents.Manycustomershave,near
theirequipment,rubberfloormatsthatcontainsmallconductivefiberstodecreaseelectrostaticdischarges.
Donotusethistypeofmattoprotectyourselffromelectricalshock.
•Findtheroomemergencypower-off(EPO)switch,disconnectingswitch,orelectricaloutlet.Ifanelectrical
accidentoccurs,youcanthenoperatetheswitchorunplugthepowercordquickly.
•Donotworkaloneunderhazardousconditionsornearequipmentthathashazardousvoltages.
•Disconnectallpowerbefore:
–Performingamechanicalinspection
–Workingnearpowersupplies
–Removingorinstallingmainunits
•Beforeyoustarttoworkonthemachine,unplugthepowercord.Ifyoucannotunplugit,askthecustomer
topower-offthewallboxthatsuppliespowertothemachine,andtolockthewallboxintheoffposition.
•Ifyouneedtoworkonamachinethathasexposeelectricalcircuits,observethefollowingprecautions:
–Ensurethatanotherperson,familiarwiththepower-offcontrols,isnearyou.
ttention:Anotherpersonmustbetheretoswitchoffthepower,ifnecessary.
–Useonlyonehandwhenworkingwithpowered-onelectricalequipment;keeptheotherhandinyour
pocketorbehindyourback.
ttention: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.
•Donotservicethefollowingpartswiththepoweronwhentheyareremovedfromtheirnormaloperating
placesinamachine:
–Powersupplyunits
–Pumps
–Blowersandfans
–Motorgenerators
–Similarunitstolistedabove
Thispracticeensurescorrectgroundingoftheunits.
•Ifanelectricalaccidentoccurs:
–Usecaution;donotbecomeavictimyourself.
–Switchoffpower.
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–Sendanotherpersontogetmedicalaid.
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.Poweroffthecomputer.Disconnectthepowercord.
3.Checkthepowercordfor:
a.Athird-wiregroundconnectoringoodcondition.Useametertomeasurethird-wireground
continuityfor0.1ohmorlessbetweentheexternalgroundpinandtheframeground.
b.Thepowercordshouldbethetypespecifiedinthepartslist.
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.MakesurethattheESDprotectivedevicesyouusehavebeencertified(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(multilingualtranslations)
Thesafetynoticesinthissectionareprovidedinthefollowinglanguages:
•English
•Arabic
•BrazilianPortuguese
•French
•German
•Hebrew
•Japanese
•Korean
•Spanish
•TraditionalChinese
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