HP 620 Compaq 320, 321, 420, 421, 620 and 621 Notebook PCs HP 420 and 620 Not - Page 104

System board, When replacing the system board

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System board NOTE: The system board spare part kit includes replacement thermal material. Description System board with UMA graphics and RTC battery with GL40 chipset having 667-MHz FSB System board with UMA graphics and RTC battery with GM45 chipset having 1066-MHz FSB System board with discrete graphics and RTC battery with PM45 chipset having 1066-MHz FSB Spare part number 605748-001 605747-001 605746-001 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 53). 5. Remove the service door (see Service door on page 53). 6. Remove the hard drive (see Hard drive on page 56). 7. Remove the optical drive (see Optical drive on page 62). 8. Remove the fan (see Fan on page 64). 9. Remove the palm rest (see Palm rest on page 68). 10. Remove the keyboard (see Keyboard on page 73). 11. Remove the top cover (see Top cover on page 77). 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: ● Memory module (see Memory module on page 59) ● WLAN module (see WLAN module on page 61) ● Modem module (see Modem module on page 103) ● Heat sink (see Heat sink on page 65) ● Processor (see Processor on page 66) ● Audio board (see Audio board on page 105) 96 Chapter 4 Removal and replacement procedures

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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 with GL40 chipset having 667-MHz FSB
605748-001
System board with UMA graphics and RTC battery with GM45 chipset having 1066-MHz FSB
605747-001
System board with discrete graphics and RTC battery with PM45 chipset having 1066-MHz FSB
605746-001
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
53
).
5.
Remove the service door (see
Service door
on page
53
).
6.
Remove the hard drive (see
Hard drive
on page
56
).
7.
Remove the optical drive (see
Optical drive
on page
62
).
8.
Remove the fan (see
Fan
on page
64
).
9.
Remove the palm rest (see
Palm rest
on page
68
).
10.
Remove the keyboard (see
Keyboard
on page
73
).
11.
Remove the top cover (see
Top cover
on page
77
).
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:
●
Memory module (see
Memory module
on page
59
)
●
WLAN module (see
WLAN module
on page
61
)
●
Modem module (see
Modem module
on page
103
)
●
Heat sink (see
Heat sink
on page
65
)
●
Processor (see
Processor
on page
66
)
●
Audio board (see
Audio board
on page
105
)
96
Chapter 4
Removal and replacement procedures