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4–50 Maintenance and Service Guide
Removal and replacement procedures
System board
✎
The system board spare part kit includes replacement thermal material.
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. Wireless modules antenna cables (see “WLAN module” on page 4-11 and “WWAN module” on page 4-14)
c. Optical drive (see “Optical drive” on page 4-20)
d. Keyboard and switch cover (see “Keyboard and switch cover” on page 4-22)
e. Display assembly (see “Display assembly” on page 4-27)
f. RTC battery (see “RTC battery” on page 4-39)
g. Top cover (see “Top cover” on page 4-42)
h. Audio/ExpressCard (see “Audio/ExpressCard board” on page 4-44)
i. Speakers (see “Speakers” on page 4-45)
j. Modem (see “Modem module” on page 4-49)
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 4-11)
■ Memory modules (see “Memory module” on page 4-16)
■ WWAN module (see “WWAN module” on page 4-14)
■ Modem module (see “Modem module” on page 4-49)
■ Fan and heat sink (see “Fan and heat sink” on page 4-35)
■ RTC battery (see “RTC battery” on page 4-39)
■ Processor (see “Processor” on page 4-40)
Description Spare part number
System board for use with HP EliteBook 8440p discrete graphics subsystem 594026-001
System board for use with HP EliteBook 8440w discrete graphics subsystem 594027-001
System board for use with HP EliteBook 8440p UMA graphics subsystem 594028-001