Before removing the I/O board, follow these steps:
1. Prepare the computer for disassembly (see Preparation for disassembly on page 39).
2. Remove the bottom cover (see Bottom cover on page 39).
3. Disconnect the battery cable from the system board (see Battery on page 41).
Remove the I/O board:
1. Release the WWAN antenna cables and the display tuner cable from the retention clips (1) that are
built into the I/O holder.
2. Release the zero insertion force (ZIF) connectors (2) the I/O board cable and nano SIM cable are
connected to, and then disconnect the I/O board cable and nano SIM cable from the I/O board.
3. Remove the four Phillips M2.0 × 4.0 screws (3) that secure the I/O board and I/O holder to
the computer.
4. Remove the I/O holder (4) from the computer.
5. Remove the I/O board (5) from the computer.
To replace the I/O board, reverse the removal procedures.
System board
To remove the system board, use these procedures and illustrations.
Table 5-10
System board descriptions and part numbers
Description Spare part number
Equipped with an AMD Ryzen R7-7735U processor and the Windows 11 operating system for use
only on computer models with WWAN capability
N95773-601
Equipped with an AMD Ryzen R7-7735U processor and a non-Windows operating system for use
only on computer models with WWAN capability
N95773-001
52 Chapter 5 Removal and replacement procedures for authorized service provider parts
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