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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
and Russia
605168-001
System board with UMA graphics, WWAN capability, and RTC battery for use only in the People's
Republic of China and Russia
605170-001
System board with discrete graphics and RTC battery for use only in the People's Republic of China
and Russia
605169-001
System board with discrete graphics, WWAN capability, and RTC battery for use only in the
People's Republic of China and Russia
605171-001
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