Compaq 300 320 321 420 421 620 and 621 Notebook PC and 420 and 620 Notebook PC - Page 110

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, Park XT, with discrete graphics and RTC battery with PM45 chipset having 1066MHz FSB (for use in APJ only) 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 625491-001 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 56). 5. Remove the service door (see Service door on page 56). 6. Remove the hard drive (see Hard drive on page 59). 7. Remove the optical drive (see Optical drive on page 68). 8. Remove the fan (see Fan on page 69). 9. Remove the palm rest (see Palm rest on page 73). 10. Remove the keyboard (see Keyboard on page 78). 11. Remove the top cover (see Top cover on page 82). 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 64) ● WLAN module (see WLAN module on page 66) ● Modem module (see Modem module on page 109) ● Heat sink (see Heat sink on page 70) ● Processor (see Processor on page 71) ● Audio board (see Audio board on page 111) 102 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, Park XT, with discrete graphics and RTC battery with PM45 chipset having 1066-
MHz FSB (for use in APJ only)
625491-001
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
56
).
5.
Remove the service door (see
Service door
on page
56
).
6.
Remove the hard drive (see
Hard drive
on page
59
).
7.
Remove the optical drive (see
Optical drive
on page
68
).
8.
Remove the fan (see
Fan
on page
69
).
9.
Remove the palm rest (see
Palm rest
on page
73
).
10.
Remove the keyboard (see
Keyboard
on page
78
).
11.
Remove the top cover (see
Top cover
on page
82
).
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
64
)
●
WLAN module (see
WLAN module
on page
66
)
●
Modem module (see
Modem module
on page
109
)
●
Heat sink (see
Heat sink
on page
70
)
●
Processor (see
Processor
on page
71
)
●
Audio board (see
Audio board
on page
111
)
102
Chapter 4
Removal and replacement procedures