ThinkPad T420s - Page 100

•“10704–in–1mediacardreader”onpage79
•“1080Keyboard”onpage80
•“1100Palmrestwithfingerprintreader,smartcardreader,andspeaker”onpage84
•“1110LCDunit”onpage88
•“1120DC-insubcard”onpage90
•“1140Bluetooth-wirelessradioswitchFPC”onpage91
Systemboard,fanassembly,34-mmExpressCardreader,andbasecover
Thefollowingcomponentssolderedonthetopsideofthesystemboardareextremelysensitive.Whenyou
servicethesystemboard,avoidanykindofroughhandling.
a
I/OControllerHub(ICH)
b
CPU
c
GraphicsMemoryControllerHub(GMCH)
d
AccelerometerchipfortheHDDActiveProtectionSystem
a
d
c
b
94HardwareMaintenanceManual