Audio board

NOTE: The spare part number for the audio board is 598684-001.

Before removing the audio 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 55).

5.Remove the switch cover and keyboard (see Switch cover and keyboard on page 56).

6.Remove the optical drive (see Optical drive on page 61).

7.Remove the power button board cable (see Power button board on page 63).

8.Remove the speakers (see Speakers on page 65).

9.Remove the thermal shield (see Thermal shield on page 67).

10.Remove the display assembly (see Display assembly on computers with 17.3-in displays on page 89 or Display assembly on computers with 15.6-in displays on page 96).

11.Remove the palm rest (see Palm rest on page 84).

12.Remove the hard drive (see Hard drive on page 87).

13.Remove the top cover (see Top cover on page 103).

Remove the audio board:

1.Position the computer right-side up with the front toward you.

2.Remove the M2.5×3.0 screw (1) that secures the audio board to the system board.

3.Release the ZIF connector (2) and remove the cable (3).

112 Chapter 4 Removal and replacement procedures

4720S, 4520S specifications

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