System board
NOTE: All system board spare part kits include a processor, system memory, eMMC storage, the Google
Chrome operating system, and replacement thermal material.
Table 5-7 System board description and part number
Description Spare part number
System board equipped with an AMD A4-9120 processor, 4 GB of system memory, and 32 GB of eMMC
storage
L51911-001
System board equipped with an AMD A4-9120 processor, 4 GB of system memory, and 16 GB of eMMC
storage
L51910-001
Before removing the system board, follow these steps:
1. Prepare the computer for disassembly (Preparation for disassembly on page 22).
2. Remove the bottom cover (see Keyboard/top cover on page 23).
3. Remove the keyboard/top cover (see Keyboard/top cover on page 23).
4. Disconnect the battery cable from the system board (see Battery on page 28).
5. Remove the WLAN module (see WLAN module on page 30).
When replacing the system board, be sure to remove the heat sink (see Heat sink on page 38) from the
defective system board and install it on the replacement system board.
Remove the system board:
1. If a protective tab covers the connectors, lift the tab.
2. Release the two reverse ZIF connectors (1) to which the USB port board cables are connected, and then
disconnect the USB port board cables from the system board.
3. Disconnect the display webcam/microphone cable (2) from the system board.
4. Release the adhesive strip (3) that secures the display panel cable to the system board.
5. Disconnect the display panel cable (4) from the system board.
Component replacement procedures 35
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