System board
NOTE: The system board spare part kit is equipped with a A4u-6400T processor, a graphics subsystem with
UMA memory, and 2.0-GB of system memory.
Component Spare part number
System board; includes 64-GB of eMMC for use in models without the Windows operating system 788084-001
System board; includes 64-GB of eMMC for use in models with Windows 8.1 Standard 788084-501
System board; includes 32-GB of eMMC for use in models without the Windows operating system 783049-001
System board; includes 32-GB of eMMC for use in models with Windows 8.1 Standard 783049-501
Before replacing the system board, follow these steps:
1. Turn off 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 the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the keyboard/top cover (see
Keyboard/top cover on page 19).
5. Remove the WLAN module (see
WLAN module on page 27).
6. Remove the rear speakers (see
Rear speakers on page 29).
Remove the system board:
1. Disconnect the front speaker cable (1) from the system board.
2. Disconnect the display panel cable (2) from the system board.
3. Release the ZIF connector (3) to which the USB board cable is attached, and then disconnect the USB
board cable from the system board.
System board 33
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