Reverse this procedure to install the USB/audio board.
System board
NOTE: All system board spare part kits include replacement thermal material.
Description Spare part number
Intel models:
Models without Windows 8 with 1-GB of discrete graphics memory 721521-001
Models without Windows 8 with 2-GB of discrete graphics memory 721522-001
Models without Windows 8, with UMA graphics, without WWAN 721523-001
Models without Windows 8, with UMA graphics, with WWAN 721525-001
Windows 8 Standard models with 1-GB of discrete graphics memory 721521-501
Windows 8 Professional models with 1-GB of discrete graphics memory 721521-601
Windows 8 Standard models with 2-GB of discrete graphics memory 721522-501
Windows 8 Professional models with 2-GB of discrete graphics memory 721522-601
Windows 8 Standard models, UMA graphics, without WWAN 721523-501
Windows 8 Professional models, UMA graphics, without WWAN 721523-601
Windows 8 Standard models, UMA graphics, with WWAN 721525-501
Windows 8 Professional models, UMA graphics, with WWAN 721525-601
AMD models:
Models without Windows 8 with 1-GB of discrete graphics memory 722818-001
Models without Windows 8 with 2-GB of discrete graphics memory 722821-001
Windows 8 Standard models with 1-GB of discrete graphics memory 722818-501
Windows 8 Professional models with 1-GB of discrete graphics memory 722818-601
Windows 8 Standard models with 2-GB of discrete graphics memory 722821-501
Windows 8 Professional models with 2-GB of discrete graphics memory 722821-601
Before removing the system board, follow these steps:
1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the
computer on, and then shut it down through the operating system.
2. Disconnect all external devices connected to the computer.
3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet, and
then unplugging the AC adapter from the computer.
4. Remove the battery (see
Battery on page 36).
5. Remove the following components:
a. Service door (see
Service door on page 37).
b. Hard drive (see
Hard drive on page 38)
66 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
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