Maintenance and Service Guide

System board
NOTE: The system board spare part kit includes a graphics subsystem with UMA memory, 4-GB of system
memory, the Chrome operating system, and replacement thermal material.
Table 5-8 System board description and spare part number information
Description Spare part numbers
For use only on computer models equipped with a backlight:
Equipped with an AMD A6-9220C 2.2-GHz (turbo up to 2.5-GHz) quad core processor (2133-MHz FSB, 8.0-
MB L3 cache, 15 W), and 64-GB of eMMC memory
L62471-001
Equipped with an AMD A6-9220C 2.2-GHz (turbo up to 2.5-GHz) quad core processor (2133-MHz FSB, 8.0-
MB L3 cache, 15 W), and 32-GB of eMMC memory
L62472-001
Equipped with an AMD A4-9120C 2.2-GHz (turbo up to 2.5-GHz) quad core processor (2133-MHz FSB, 8.0-
MB L3 cache, 15 W), and 32-GB of eMMC memory
L62473-001
For use only on computer models not equipped with a backlight:
Equipped with an AMD A6-9220C 2.2-GHz (turbo up to 2.5-GHz) quad core processor (2133-MHz FSB, 8.0-
MB L3 cache, 15 W), and 64-GB of eMMC memory
L51322-001
Equipped with an AMD A6-9220C 2.2-GHz (turbo up to 2.5-GHz) quad core processor (2133-MHz FSB, 8.0-
MB L3 cache, 15 W), and 32-GB of eMMC memory
L51321-001
Equipped with an AMD A4-9120C 2.2-GHz (turbo up to 2.5-GHz) quad core processor (2133-MHz FSB, 8.0-
MB L3 cache, 15 W), and 32-GB of eMMC memory
L51319-001
Equipped with an AMD A4-9120C 2.2-GHz (turbo up to 2.5-GHz) quad core processor (2133-MHz FSB, 8.0-
MB L3 cache, 15 W), and 16-GB of eMMC memory
L62470-001
System board pads L48489-001
Before removing the system 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. Disconnect all external devices connected to the computer.
3. 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.
4. Remove the keyboard/top cover (see Keyboard/top cover on page 25).
5. Disconnect the battery cable from the system board (see Battery on page 33).
6. Remove the WLAN module (see WLAN module on page 34).
7. Remove the speakers (see Speakers on page 38).
When replacing the system board, be sure to remove the heat sink (see Heat sink on page 44) from
the defective system board and install them on the replacement system board.
Remove the system board:
1. Release the ZIF connectors (1) to which the connector board cables are connected, and then disconnect
the connector board cables from the system board.
2. Disconnect the webcam/microphone module cable (2) from the system board.
Component replacement procedures 41