HP 4720S, 4520S manual System board, Description Spare part number

System board

NOTE: The system board spare part kit includes replacement thermal material.

Description	Spare part number
System board with UMA graphics and RTC battery	598667-001
System board with UMA graphics, WWAN capability, and RTC battery	598669-001
System board with discrete graphics and RTC battery	598668-001
System board with discrete graphics, WWAN capability, and RTC battery for use in 4720s models	598670-001
System board with UMA graphics and RTC battery for use only in the People's Republic of China	605168-001
and Russia
System board with UMA graphics, WWAN capability, and RTC battery for use only in the People's	605170-001
Republic of China and Russia
System board with discrete graphics and RTC battery for use only in the People's Republic of China	605169-001
and Russia
System board with discrete graphics, WWAN capability, and RTC battery for use only in the	605171-001
People's Republic of China and Russia
System board with ATI Mobility Radeon HD 5470 graphics for use in 4720s models	628794-001
System board with ATI Mobility Radeon HD 5470 graphics for use in 4520s models	628795-001

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 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).

114 Chapter 4 Removal and replacement procedures