Lenovo ThinkPad X220 Maintenance Manual page 94

After replacing the system board, run PC-Doctor for DOS to make sure that the HDD Active Protection
System still functions. The procedure is as follows:
1. Place the computer on a horizontal surface.
2. Run Diagnostics ➙ ThinkPad Devices ➙ HDD Active Protection Test.
Attention: Do not apply physical shock to the computer while the test is running.
For access, remove these FRUs in order:
• "1010 Digitizer pen" on page 61
• "1020 Battery pack" on page 61
• "1050 Hinge caps" on page 66
• "1060 Keyboard" on page 66
• "1070 Palm rest" on page 69
• "1090 PCI Express Mini Card for wireless LAN/WiMAX" on page 73
• "1100 PCI Express Mini Card for wireless WAN" on page 75
• "1110 Bluetooth daughter card" on page 76
• "1120 Keyboard bezel" on page 77
• "1130 LCD assembly" on page 79
• "1140 DC-in connector, base cover, fan, digitizer pen case, and pen switch assembly" on page 82
Removal steps of system board and ExpressCard slot assembly
The following components soldered on the system board are extremely sensitive. When you service the
system board, avoid any kind of rough handling.
a
Platform Controller Hub (PCH)
b
CPU
c
Accelerometer chip for the HDD Active Protection System
Note: The ExpressCard slot assembly is attached to the system board.
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Hardware Maintenance Manual
a