Manual
1210SystemboardandExpressCardslotassembly
Foraccess,removetheseFRUsinorder:
•“1010Batterypack”onpage63
•“1020ExpressCardblankbezel”onpage64
•“1030SerialUltrabayEnhanceddeviceortravelbezel”onpage65
•“1040Harddiskdrive(HDD)andsolidstatedrive(SSD)”onpage66
•“1050DIMMslotcover”onpage69
•“1070PCIExpressMiniCardforwirelessWAN”onpage71
•“1080Keyboard”onpage73
•“1110PCIExpressMiniCardforwirelessLAN”onpage81
•“1120Keyboardbezelassembly,FPCcable,andBluethoothdaughtercard”onpage83
•“1150Speakerassembly”onpage91
•“1160LCDunit”onpage93
•“1170Fanassembly”onpage97
•“1180CPU”onpage101
•“1190BasecoverassemblyandDC-inconnectorcable”onpage102
Importantnoticesforhandlingthesystemboard:
Whenhandlingthesystemboard,bearthefollowinginmind.
•Thesystemboardhasanaccelerometer,whichcanbebrokenbyapplyingseveralthousandsofG-forces.
Note:Droppingasystemboardfromaheightofaslittleas6inchessothatitfallsatonahardbenchcansubject
theaccelerometertoasmuchas6,000G'sofshock.
•Becarefulnottodropthesystemboardonabenchtopthathasahardsurface,suchasmetal,wood,orcomposite.
•Ifasystemboardisdropped,youmusttestit,usingPC-DoctorforDOS,tomakesurethattheHDDActive
ProtectionSystem™stillfunctions.
Note:IfthetestshowsthatHDDActiveProtectionSystemisnotfunctioning,besuretodocumentthedropina
rejectreport,andreplacethesystemboard.
•Avoidroughhandlingofanykind.
•Ateverypointintheprocess,besurenottodroporstackthesystemboard.
•Ifyouputasystemboarddown,besuretoputitonlyonapaddedsurfacesuchasanESDmatoracorrugated
conductivesurface.
Afterreplacingthesystemboard,runPC-DoctorforDOStomakesurethatHDDActiveProtectionSystemstill
functions.Theprocedureisasfollows:
1.Placethecomputeronahorizontalsurface.
2.RunDiagnostics➙ThinkPadDevices➙HDDActiveProtectionT est.
Attention:Donotapplyphysicalshocktothecomputerwhilethetestisrunning.
RemovalstepsofsystemboardandExpressCardslotassembly
Thefollowingcomponentssolderedonthetopsideofthesystemboardareextremelysensitive.Whenyou
servicethesystemboard,avoidanykindofroughhandling.
a
CPU
b
AccelerometerchipfortheHDDActiveProtectionSystem
108ThinkPadT420andT420iHardwareMaintenanceManual