Lenovo ThinkPad T470 20HD, Руководство по техническому обслуживанию аппаратной части, Страница: 94 / 116

1160 System board
Important notices for handling the system board
When handling the system board, read the following:
• The system board has an accelerometer, which can be broken when several thousands of G-forces are
applied.
Note: Dropping a system board from a height of as little as 6 inches so that it falls flat on a hard bench
can subject the accelerometer to as much as 6000 G's of shock.
• Be careful not to drop the system board on a bench top that has a hard surface, such as metal, wood, or
composite.
• Avoid rough handling of any kind.
• At every point in the process, be sure not to drop or stack the system board.
• If you put a system board down, be sure to put it only on a padded surface such as an ESD mat or a
corrugated conductive material.
Note: Before you start the servicing, disable the built-in battery. See “Disabling the built-in battery” on page
68.
For access, remove these FRUs in order:
• “1010 Removable battery” on page 68
• “1020 Micro SIM card” on page 69
• “1030 Base cover assembly” on page 69
• “1040 Memory module” on page 71
• “1050 Internal storage drive” on page 72
• “1060 Wireless-WAN card” on page 76 or “1080 M.2 solid-state drive in the Wireless-WAN-card slot” on
page 79
• “1070 Wireless-LAN module or WiGig module” on page 77
• “1090 Keyboard” on page 79
• “1100 Coin-cell battery” on page 81
• “1110 Speaker assembly” on page 82
• “1120 Built-in battery” on page 83
• “1130 Smart-card reader assembly” on page 84
• “1140 I/O bracket and RJ45 bracket” on page 85
• “1150 Thermal fan assembly” on page 86
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 Graphics processing unit (GPU)
b Central processing unit (CPU)
c Embedded controller
d Accelerometer chip for the hard disk drive Active Protection System
TM
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T470 Hardware Maintenance Manual