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USB board
Description Spare part number
For use only on computer models equipped with a graphics subsystem with discrete memory 724142-001
For use only on computer models with Leap Motion capability 741074-001
For use only on computer models equipped with a graphics subsystem with UMA memory 720251-001
Before removing the USB 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 46).
5. Remove the display panel (see
Display panel on page 59).
6. Remove the service cover (see
Service cover on page 47).
7. Remove the hard drive (see
Hard drive on page 48).
8. Remove the memory modules (see
Memory modules on page 51).
9. Remove the WLAN module (see
WLAN module on page 52).
10. Remove the optical drive (see
Optical drive on page 55).
11. Remove the base enclosure (see
Base enclosure on page 64).
12. Remove the front speakers (see
Front speakers on page 68).
13. Remove the subwoofer (see ).
Component replacement procedures
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