Lenovo ThinkPad X1 Carbon Gen 12 Hardware Maintenance Manual page 77

When handling the system board, read the following:
• Some components mounted on a system board are very sensitive. Improper handling of a system board
can cause damage to those components, and may cause a system malfunction.
• 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 surface.
• Avoid bending a system board and hard pushing to prevent cracking at each BGA (Ball Grid Array)
chipset.
For access, remove these FRUs in order:
• "Removing the nano-SIM-card and nano-SIM-card tray" on page 56
• "1010 Base cover assembly" on page 56
• "1020 Built-in battery" on page 57
• "1030 M.2 solid-state drive and bracket" on page 58
• "1040 Wireless WAN card (for selected models)" on page 59
• "1050 Thermal fan assembly" on page 62
• "1060 Speaker assembly" on page 63
• "1070 Trackpad, fingerprint reader, and P sensor cable" on page 64
• "1080 Wireless WAN antenna assembly(for selected models)" on page 64
• "1120 USB bracket" on page 67
This computer shares a common system board with another computer. After replacing the system board,
you will be prompted to input a brand name to correctly identify the machine type. The following table
contains the brand name required to complete this step.
Note: Input the exact brand name as shown in this table.
Product name
ThinkPad X1 Carbon Gen 12
Machine type (MT)
21KC and 21KD
.
Chapter 8 Removing or replacing a FRU
71