System board
NOTE: The system board spare part kit includes UMA or discrete graphics subsystem memory and
replacement thermal material.
Description Spare part number
For use in Intel HM55 UMA computer models 639521-001
For use in Intel HM65 UMA computer models 639522-001
For use in Intel HM55 discrete, 512 MB, computer models 639523-001
For use in Intel HM55 discrete, 1 GB, computer models 639524-001
For use in Intel HM65 discrete, 512 MB, computer models 639525-001
For use in Intel HM65 discrete, 1 GB, computer models 639526-001
For use in AMD UMA computer models 640893-001
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:
●
Memory modules (see
Memory module on page 45)
●
WLAN module (see
WLAN module on page 43)
Before removing the system board, remove the following components:
1. Battery (see
Battery on page 37)
2. Service access cover (see
Service access cover on page 38)
3. Hard drive (see
Hard drive on page 39)
4. Optical drive (see
Optical drive on page 41)
5. WLAN module (see
WLAN module on page 43)
6. Memory module (see
Memory module on page 45)
7. Keyboard (see
Keyboard on page 47)
8. Top cover (see
Top cover on page 49)
9. USB board (see
USB board on page 56)
10. Display assembly (see
Display assembly on page 59)
11. Power connector (see
Power connector on page 58)
Remove the optical drive connector board:
1. Turn the computer right-side up, with the front toward you.
2. Remove the three Phillips 4.0 x 2.5 screws (1) that secure the optical drive connector board to
the computer.
66 Chapter 4 Removal and replacement procedures
