HP Pavilion g4-2000 HP Pavilion g4 Notebook PC - Maintenance and Service Guide - Page 76

Fan and heat sink, from the system board.

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Fan and heat sink NOTE: The fan and heat sink spare part kits include replacement thermal material. Description Fan Heat sink for use only with computer models equipped with UMA video memory Heat sink for use only with computer models equipped with discrete video memory Spare part number 680551-001 680549-001 680550-001 NOTE: To properly ventilate the computer, allow at least 7.6 cm (3 in) of clearance on the left side of the computer. The computer uses an electric fan for ventilation. The fan is controlled by a temperature sensor and is designed to turn on automatically when high temperature conditions exist. These conditions are affected by high external temperatures, system power consumption, power management/battery conservation configurations, battery fast charging, and software requirements. Exhaust air is displaced through the ventilation grill located on the left side of the computer. Before removing the fan and heat sink, 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 31). 5. Remove the service door (see Service door on page 32). 6. Remove the optical drive (see Optical drive on page 33). 7. Remove the hard drive (see Hard drive on page 36). 8. Remove the keyboard (see Keyboard on page 43). 9. Remove the top cover (see Top cover on page 46). 10. Remove the system board (see System board on page 65). Remove the fan and heat sink: 1. Turn the system board upside down, with the front toward you. 2. Disconnect the fan cable (1) from the system board. CAUTION: To prevent damage to heat sinks and/or processors, loosen/tighten captive screws in sequence as numerically labeled. NOTE: The heat sink and fan appearance and the number of screws may be different from the heat sink and fan pictured. 3. Loosen the four captive screws (2) and the three captive screws (3) that secure the heat sink to the system board. NOTE: Due to the adhesive quality of the thermal material located between the heat sink and system board components, it may be necessary to move the heat sink from side to side to detach it. 68 Chapter 4 Removal and replacement procedures

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Fan and heat sink
NOTE:
The fan and heat sink spare part kits include replacement thermal material.
Description
Spare part number
Fan
680551-001
Heat sink for use only with computer models equipped with UMA video memory
680549-001
Heat sink for use only with computer models equipped with discrete video memory
680550-001
NOTE:
To properly ventilate the computer, allow at least 7.6 cm (3 in) of clearance on the left side
of the computer. The computer uses an electric fan for ventilation. The fan is controlled by a
temperature sensor and is designed to turn on automatically when high temperature conditions exist.
These conditions are affected by high external temperatures, system power consumption, power
management/battery conservation configurations, battery fast charging, and software requirements.
Exhaust air is displaced through the ventilation grill located on the left side of the computer.
Before removing the fan and heat sink, 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
31
).
5.
Remove the service door (see
Service door
on page
32
).
6.
Remove the optical drive (see
Optical drive
on page
33
).
7.
Remove the hard drive (see
Hard drive
on page
36
).
8.
Remove the keyboard (see
Keyboard
on page
43
).
9.
Remove the top cover (see
Top cover
on page
46
).
10.
Remove the system board (see
System board
on page
65
).
Remove the fan and heat sink:
1.
Turn the system board upside down, with the front toward you.
2.
Disconnect the fan cable
(1)
from the system board.
CAUTION:
To prevent damage to heat sinks and/or processors, loosen/tighten captive screws
in sequence as numerically labeled.
NOTE:
The heat sink and fan appearance and the number of screws may be different from the
heat sink and fan pictured.
3.
Loosen the four captive screws
(2)
and the three captive screws
(3)
that secure the heat sink to
the system board.
NOTE:
Due to the adhesive quality of the thermal material located between the heat sink and
system board components, it may be necessary to move the heat sink from side to side to
detach it.
68
Chapter 4
Removal and replacement procedures