Lenovo ThinkPad T420s Hardware Maintenance Manual page 100

• "1070 4–in–1 media card reader" on page 79
• "1080 Keyboard" on page 80
• "1100 Palm rest with fingerprint reader, smart card reader, and speaker" on page 84
• "1110 LCD unit" on page 88
• "1120 DC-in sub card" on page 90
• "1140 Bluetooth-wireless radio switch FPC" on page 91
System board, fan assembly, 34-mm ExpressCard reader, and base cover
The following components soldered on the top side of the system board are extremely sensitive. When you
service the system board, avoid any kind of rough handling.
a
I/O Controller Hub (ICH)
b
CPU
c
Graphics Memory Controller Hub (GMCH)
d
Accelerometer chip for the HDD Active Protection System
94
Hardware Maintenance Manual
Downloaded from LpManual.com Manuals
a