ThinkPad E550 - Replacing the System Board and Thermal Fan

7
1130Systemboardandthermalfan
Importantnoticesforhandlingthesystemboard:
Whenhandlingthesystemboard,readthefollowing:
•Thesystemboardhasanaccelerometer,whichcanbebrokenwhenseveralthousandsofG-forcesareapplied.
Note:Droppingasystemboardfromaheightofaslittleas6inchessothatitfallsflatonahardbenchcansubject
theaccelerometertoasmuchas6000G'sofshock.
•Becarefulnottodropthesystemboardonabenchtopthathasahardsurface,suchasmetal,wood,orcomposite.
•Avoidroughhandlingofanykind.
•Ateverypointintheprocess,besurenottodroporstackthesystemboard.
•Ifyouputasystemboarddown,besuretoputitonlyonapaddedsurfacesuchasanESDmatoracorrugated
conductivesurface.
Foraccess,removetheseFRUsinorder:
•“1020Batterypack”onpage66
•“1030Largebottomcover”onpage67
•“1040Smallbottomcover”onpage68
•“1050Opticaldriveoroptical-drivebaybezel”onpage69
•“1060Memorymodule”onpage70
•“1070Harddiskdriveassemblyorsolid-statedriveassembly”onpage70
•“1080WirelessLANcard”onpage72
•“1090Coin-cellbattery”onpage73
•“1110Keyboard”onpage73
•“1120Keyboardbezelassembly”onpage75
Attention:Thefollowingcomponentssolderedonthetopsideofthesystemboardareextremelysensitive.
Whenyouservicethesystemboard,avoidanykindofroughhandling.
78HardwareMaintenanceManual