Lenovo ThinkPad T420s Hardware Maintenance Manual page 98

• "1070 4–in–1 media card reader" on page 77
• "1080 Keyboard" on page 78
• "1100 Palm rest with fingerprint reader, smart card reader, and speaker" on page 82
• "1110 LCD unit" on page 86
• "1120 DC-in sub card" on page 88
• "1140 Bluetooth-wireless radio switch FPC" on page 89
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
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Hardware Maintenance Manual