- Hewlett-Packard Personal Computer User Manual

System board
NOTE: All system board kits include replacement thermal material.
Description Spare part number
System board for use in models with 1 GB of HD5450 discrete graphics memory 616244-001
System board for use in models with 512 MB of HD5450 discrete graphics memory 608203-001
System board for use in HM55 models with 512 MB of HD5470 discrete graphics memory 621044-001
System board for use in HM55 models with 1 GB of HD5470 discrete graphics memory 621045-001
System board for use in HM55 models with 512 MB of HD6370 discrete graphics memory 630713-001
System board for use in HM55 models with 1 GB of HD6370 discrete graphics memory 630714-001
System board for use in models with UMA graphics 608204-001
System board for use in HM55 models with WiMAX and UMA graphics 633863-001
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:
●
SIM (see
SIM on page 46)
●
RTC battery (see
RTC battery on page 49)
●
Memory modules (see
Memory module on page 47)
●
WLAN module (see
WLAN module on page 50)
●
WWAN module (see
WWAN module on page 55)
●
Fan/heat sink assembly (see
Fan/heat sink assembly on page 85)
●
Processor (see
Processor on page 90)
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 45).
5. Remove the following components:
a. Hard drive (see
Hard drive on page 57)
b.
WLAN module (see
WLAN module on page 50)
c. WWAN module (see
WWAN module on page 55)
Component replacement procedures
83