System board, RTC battery see RTC battery on page

System board

Description	Spare part number

For use only in computer models with Intel processors:

Equipped with microphones	448596-001

Not equipped with microphones	448598-001

Not equipped with UMA graphics subsystems and with a camera module	460715-001

Equipped with discrete graphics subsystems and with a camera module	460716-001

On defeatured models	460717-001

For use only in computer models with AMD processors:

Full-featured models without a camera module	453411-001

Defeatured models without a camera module	453412-001

Full-featured models with a camera module	462535-001

Defeatured models with a camera module	462536-001

When replacing the system board, be sure that the following components are removed from the defective system board and installed on the replacement system board:

●RTC battery (see RTC battery on page 61)

●Memory modules (see Memory module on page 62)

●WLAN module (see WLAN module on page 57)

●Modem module (see Modem module on page 87) Before removing the system 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 53).

5. Remove the following components:

a. Hard drive (see Hard drive on page 54)