I/O board
Description Spare part number
I/O board L28252-001
I/O board cables (included in Cable Kit) L28263-001
Before removing the I/O board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is o or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Place the computer in “Battery Safe mode” (Battery Safe mode on page 31).
3. Disconnect all external devices connected to the computer.
4. Disconnect the power from the computer by rst unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
5. Remove the following components:
a. Service door (Service doors on page 32).
b. Keyboard (Keyboard on page 40)
c. Top cover (Top cover on page 47)
d. Battery (Battery on page 52)
Remove the I/O board:
1. Remove the two Torx T8 2.5×4.0 screws (1) that secure the board to the computer.
2. Remove the I/O board from the computer (2).
Reverse this procedure to install the I/O board.
Component replacement procedures 53
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