Lenovo T550 Technical Information download pdf (Page 3)

Contents

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

Chapter1.Safetyinformation......1

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

Electricalsafety...............1

Safetyinspectionguide............2

Handlingdevicesthataresensitivetoelectrostatic

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

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

Safetynotices(multilingualtranslations)......4

Chapter2.Importantservice

information..............19

StrategyforreplacingFRUs.........19

Strategyforreplacingasolid-statedrive...19

Importantnoticeforreplacingasystem

board................20

Howtouseerrormessage........20

StrategyforreplacingFRUsforCTO,special-bid,

andstandardmodels............20

Productdeﬁnition............20

FRUidentiﬁcation............20

Chapter3.Generalcheckout.....23

Whattodoﬁrst..............23

Checkoutguide..............24

LenovoSolutionCenter.........24

Quicktestprograms...........24

UEFIdiagnosticprogram.........25

Bootablediagnosticprograms.......25

Powersystemcheckout...........26

Checkingtheacpoweradapter......26

Checkingthebatteryandoperational

charging...............27

Checkingthecoin-cellbattery.......27

Chapter4.Relatedservice

information..............29

Restoringthefactorycontentsbyusingthe

productRecoveryDiscSet..........29

UsingtheWindowsrecoveryprogramsonthe

Windows8.1operatingsystem........30

Passwords................32

Power-onpassword...........32

Harddiskpassword...........32

Supervisorpassword..........33

Howtoremovethepower-onpassword...33

Howtoremovetheharddiskpassword...34

Powermanagement............34

Screenblankmode(fortheWindows7

operatingsystemonly)..........34

Sleepmode..............34

Hibernationmode...........35

Symptom-to-FRUindex...........35

Numericerrorcodes..........36

Errormessages............37

Beepsymptoms............37

No-beepsymptoms...........38

LCD-relatedsymptoms.........38

Intermittentproblems..........38

Undeterminedproblems.........39

Chapter5.Locations.........41

Locatingcomputercontrols,connectors,and

indicators.................41

Frontview...............41

Left-sideview.............42

Bottomview..............42

LocatingFRUsandCRUs..........43

MajorFRUs..............44

LCDFRUs..............45

MiscellaneouspartsandotherFRUs....48

LookingupFRUinformation.........49

Chapter6.FRUreplacement

notices................51

Commonservicetools...........51

Screwnotices...............51

Retainingserialnumbers...........52

Restoringtheserialnumberofthesystem

unit.................52

RetainingtheUUID...........53

ReadingorwritingtheECAinformation...54

Chapter7.Removingorreplacinga

FRU..................55

Generalguidelines.............55

Beforeservicingthecomputer........56

Disablingthebuilt-inbattery.......56

RemovingthemicroSIMcard.......56

RemovingamajorFRU...........56

1010Removablebattery.........57

1020Basecoverassembly........57

1030Keyboard.............59

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