HP 4311S manual System board

Removal and replacement procedures

System board

✎The system board spare part kit includes replacement thermal material.

Description	Spare part number
PM45 system board for use only on computer models equipped with graphics subsystems with discrete memory:
■ For use only on computer models equipped with WWAN capability	577223-001
■ For use only on computer models not equipped with WWAN capability	577222-001
GM45 system board for use only on computer models equipped with graphics subsystems with UMA memory:
■ For use only on computer models equipped with WWAN capability	577225-001
■ For use only on computer models not equipped with WWAN capability	577224-001
GL40 system board for use only on computer models equipped with graphics subsystems with UMA memory:
■ For use only on computer models equipped with WWAN capability	577221-001
■ For use only on computer models not equipped with WWAN capability	577220-001

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 4-7).

5.Remove the following components:

a.Hard drive (see “Hard drive” on page 4-9)

b.Memory/wireless module compartment cover (see “WLAN module” on page 4-12)

c.Optical drive (see “Optical drive” on page 4-18)

d.Keyboard and switch cover (see “Keyboard and switch cover” on page 4-20)

e.Palm rest (see “Palm rest” on page 4-25)

f.Display assembly (see “Display assembly” on page 4-27)

g.Top cover (see “Top cover” on page 4-36)

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

■SIM (see “SIM” on page 4-8)

■WLAN module (see “WLAN module” on page 4-12)

■Memory modules (see “Memory module” on page 4-16)

■WWAN module (see “WWAN module” on page 4-17)

■Modem module (see “Modem module” on page 4-42)

■Fan and heat sink (see “Fan and heat sink” on page 4-51)

■RTC battery (see “RTC battery” on page 4-54)

■Processor (see “Processor” on page 4-55)

Maintenance and Service Guide 4–47