Lenovo ThinkPad T420s Hardware Maintenance Manual

Category
Notebooks
Type
Hardware Maintenance Manual

This manual is also suitable for

HardwareMaintenanceManual
ThinkPadT420sandT420si
Note
Beforeusingthisinformationandtheproductitsupports,besuretoreadthegeneralinformationunder
AppendixA“Notices”onpage141
.
ThirdEdition(August2011)
©CopyrightLenovo2011.
LIMITEDANDRESTRICTEDRIGHTSNOTICE:IfdataorsoftwareisdeliveredpursuantaGeneralServices
Administration“GSAcontract,use,reproduction,ordisclosureissubjecttorestrictionssetforthinContract
No.GS-35F-05925.
Contents
Aboutthismanual..........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
Productdenition............32
FRUidenticationforCTO,CMV,andGAV
products...............33
Chapter3.Generalcheckout.....35
Whattodorst..............35
Checkoutguide..............36
DiagnosticsusingPC-DoctorforDOS....36
LenovoThinkVantageToolbox.......39
FRUtests...............39
Powersystemcheckout...........41
Checkingtheacpoweradapter......41
Checkingoperationalcharging......42
Checkingthebatterypack........42
Checkingthebackupbattery.......42
Chapter4.Relatedservice
information..............45
RestoringthefactorycontentsbyusingProduct
Recoverydiscs..............45
RestoringthefactorycontentsbyusingRecovery
DiscSet.................45
Passwords................47
Power-onpassword...........47
Harddiskpassword...........47
Supervisorpassword..........47
Howtoremovethepower-onpassword...47
Howtoremovetheharddiskpassword...48
Powermanagement............48
Screenblankmode...........48
Sleep(standby)mode..........49
Hibernationmode...........49
Symptom-to-FRUindex...........50
Numericerrorcodes..........51
Errormessages............52
Beepsymptoms............52
No-beepsymptoms...........53
LCD-relatedsymptoms.........53
Intermittentproblems..........54
Undeterminedproblems.........54
Chapter5.Statusindicators.....55
Chapter6.Fnkeycombinations...59
Chapter7.FRUreplacement
notices................61
Screwnotices...............61
Retainingserialnumbers...........62
Restoringtheserialnumberofthesystem
unit.................62
RetainingtheUUID...........62
ReadingorwritingtheECAinformation...63
Chapter8.Removingandreplacinga
FRU..................65
BeforeservicingThinkPadT420sandT420si
models..................65
1010Batterypack.............66
1020SerialUltrabaySlimdeviceortravelbezel..67
1030Solidstatedrive(SSD)orharddiskdrive
(HDD)..................68
1040DIMM................70
1050PCIExpressMiniCardforwirelessLAN..72
1060PCIExpressMiniCardforwirelessWAN..75
10704–in–1mediacardreader........77
1080Keyboard..............78
1090Backupbattery............81
1100Palmrestwithngerprintreader,smartcard
reader,andspeaker.............82
1110LCDunit...............86
1120DC-insubcard............88
1130Bluetoothdaughtercard(BDC-3.0)....89
1140Bluetooth-wirelessradioswitchFPC....89
©CopyrightLenovo2011
i
1150Systemboard,fanassembly,34-mm
ExpressCardreader,andbasecover......91
1160mSATA...............97
2010LCDbezelassembly..........99
2020LCDpanel..............100
2030Integratedcamera,microphone,orhall
sensorcard................102
2040LEDsubcard.............104
2050LCDcable..............105
2060Hingekit...............106
2070LEDcable..............108
2080AntennakitandLCDrearcoverassembly..109
Chapter9.Locations........113
Frontview................113
Rearview.................114
Bottomview...............114
Chapter10.Partslist........115
Overall..................116
LCDFRUs................127
Keyboard.................131
Miscellaneousparts............132
acpoweradapter.............133
Powercords...............133
Recoverydiscs..............134
WindowsXPProfessional(32bit)DVDs...134
WindowsXPProfessionalGeneric(32bit)
DVDs................135
WindowsVistaHomeBasic(32bit)DVDs..136
WindowsVistaBusiness(32bit)DVDs...136
Windows7Ultimate(32bit)DVDs.....136
Windows7Ultimate(64bit)DVDs.....136
Windows7HomeBasic(32bit)DVDs....137
Windows7HomePremium(32bit)DVDs..137
Windows7HomePremium(64bit)DVDs..138
Windows7Professional(32bit)DVDs....139
Windows7Professional(64bit)DVDs....139
Commonservicetools...........140
AppendixA.Notices.........141
Electronicemissionsnotices.........142
Trademarks................142
iiHardwareMaintenanceManual
Aboutthismanual
ThismanualcontainsserviceandreferenceinformationforthefollowingThinkPad
®
products.
ThinkPadT420sandT420si
Machinetypes(MT)4170,4171,4172,4173,4174,4175,and4176
Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems.
Important:ThismanualisintendedonlyfortrainedservicetechnicianswhoarefamiliarwithThinkPad
products.Usethismanualalongwiththeadvanceddiagnosticteststotroubleshootproblems
effectively.BeforeservicingaThinkPadproduct,besuretoreadalltheinformationunderChapter1“Safety
information”onpage1
andChapter2“Importantserviceinformation”onpage31.
©CopyrightLenovo2011
iii
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.
Attention:Metalobjectsaregoodelectricalconductors.
Wearsafetyglasseswhenyouarehammering,drilling,soldering,cuttingwire,attachingsprings,using
solvents,orworkinginanyotherconditionsthatmightbehazardoustoyoureyes.
Afterservice,reinstallallsafetyshields,guards,labels,andgroundwires.Replaceanysafetydevice
thatiswornordefective.
Reinstallallcoverscorrectlybeforereturningthemachinetothecustomer.
Fanlouversonthemachinehelptopreventoverheatingofinternalcomponents.Donotobstructfan
louversorcoverthemwithlabelsorstickers.
©CopyrightLenovo2011
1
Electricalsafety
Observethefollowingruleswhenworkingonelectricalequipment.
Important:Useonlyapprovedtoolsandtestequipment.Somehandtoolshavehandlescoveredwithasoft
materialthatdoesnotinsulateyouwhenworkingwithliveelectricalcurrents.Manycustomershave,near
theirequipment,rubberoormatsthatcontainsmallconductiveberstodecreaseelectrostaticdischarges.
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:
Usecaution;donotbecomeavictimyourself.
Switchoffpower.
2HardwareMaintenanceManual
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.
Notes:
1.Useproduct-specicESDprocedureswhentheyexceedtherequirementsnotedhere.
2.MakesurethattheESDprotectivedevicesyouusehavebeencerti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(multilingualtranslations)
Thesafetynoticesinthissectionareprovidedinthefollowinglanguages:
English
Arabic
BrazilianPortuguese
French
German
Hebrew
Japanese
Korean
Spanish
T raditionalChinese
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Lenovo ThinkPad T420s Hardware Maintenance Manual

Category
Notebooks
Type
Hardware Maintenance Manual
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