Lenovo 20N4, Hardware Maintenance Manual

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1210 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 six 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.
For access, remove these FRUs in order:
• “1010 Removing the nano-SIM card and the nano-SIM-card tray” on page 64
• “1020 Base cover assembly” on page 64
• “1030 Keyboard” on page 66
Note: If the keyboard must be removed to access other FRUs, you need the keyboard removal tool
(product part number: 01LX856) to remove the keyboard. You can purchase the tool as a separate FRU at:
https://support.lenovo.com/partslookup
• “1040 M.2 solid-state drive” on page 69
• “1050 Wireless WAN card” on page 70
• “1060 Memory module” on page 71
• “1080 Built-in battery” on page 72
• “1090 Thermal fan assembly” on page 73
Removal steps of the system board
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.
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T590 and P53s Hardware Maintenance Manual