ThinkPad T420s - Chapter 2. Important Service Information; Strategy for replacing FRUs

Chapter2.Importantserviceinformation
Thischapterpresentsfollowingimportantserviceinformationthatappliestoallmachinetypessupportedby
thismanual:
•“StrategyforreplacingFRUs”onpage31
–“Strategyforreplacingaharddiskdrive”onpage32
–“Importantnoticeforreplacingasystemboard”onpage32
–“Howtouseerrormessage”onpage32
•“StrategyforreplacingFRUsforCTO,CMV,andGAV”onpage32
–“Productdefinition”onpage32
–“FRUidentificationforCTO,CMV,andGAVproducts”onpage33
Important:
•AdvisecustomerstocontacttheLenovoCustomerSupportCenteriftheyneedanyassistancein
obtainingorinstallinganysoftwarefixes,drivers,andUEFIBIOSdownloads.Telephonenumbersfor
LenovoSupportareavailableat:http://www.lenovo.com/support/phone
•SystemDisassembly/ReassemblyvideosthatshowtheFRUremovalsorreplacementsfortheLenovo
®
authorizedservicetechniciansareavailableinthefollowingsupportsite:
http://www.lenovoservicetraining.com/ion/
StrategyforreplacingFRUs
Beforereplacingparts:
Makesurethatallsoftwarefixes,drivers,andUEFIBIOSdownloadsareinstalledbeforereplacingany
FRUslistedinthismanual.
Afterasystemboardisreplaced,ensurethatthelatestUEFIBIOSisloadedtothesystemboardbefore
completingtheserviceaction.
Todownloadsoftwarefixes,drivers,andUEFIBIOS,doasfollows:
1.Gotohttp://www.lenovo.com/support.
2.EntertheproductnumberofthecomputerorpressAuto-detectbuttononthescreen.
3.SelectDownloadsanddrivers.
4.Followthedirectionsonthescreenandinstallthenecessarysoftware.
UsethefollowingstrategytopreventunnecessaryexpenseforreplacingandservicingFRUs:
•IfyouareinstructedtoreplaceaFRUbutthereplacementdoesnotcorrecttheproblem,reinstall
theoriginalFRUbeforeyoucontinue.
•Somecomputershavebothaprocessorboardandasystemboard.Ifyouareinstructedtoreplaceeither
theprocessorboardorthesystemboard,andreplacingoneofthemdoesnotcorrecttheproblem,
reinstallthatboard,andthenreplacetheotherone.
•IfanadapteroradeviceconsistsofmorethanoneFRU,anyoftheFRUsmaybethecauseoftheerror.
Beforereplacingtheadapterordevice,removetheFRUs,onebyone,toseeifthesymptomschange.
ReplaceonlytheFRUthatchangedthesymptoms.
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