HP dx2390 Service Reference Guide: HP Compaq dx2390 Business PC - Page 65

Heatsink, socket are very fragile and any damage to them may require replacing the system board.

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Heatsink WARNING! To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect the power cord from the wall outlet and allow the internal system components to cool before touching. You will need a screwdriver with a narrow shaft to loosen the heatsink screws. 1. Prepare the computer for disassembly (Preparation for Disassembly on page 26). 2. Remove the computer access panel (Computer Access Panel on page 30). 3. Unplug the fan cable from the system board (CPU FAN1). 4. Using a screwdriver with a narrow shaft, loosen the four silver T15 captive screws that secure the heatsink to the system board. NOTE: The screw closest to the side of the chassis may be difficult to access. You may need to remove the fan on top of the heatsink to gain access to this screw. To remove the fan, pull back on the four clips that secure the fan to the heatsink and loosen the fan from the clip. CAUTION: Heatsink retaining screws should be removed in diagonally opposite pairs (as in an X) to even the downward forces on the processor. This is especially important as the pins on the socket are very fragile and any damage to them may require replacing the system board. 5. Remove the heatsink from the processor. When reinstalling the heatsink, make sure that its bottom has been cleaned with an alcohol wipe and fresh thermal grease has been applied to the top of the processor. CAUTION: Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to evenly seat the heatsink on the processor. This is especially important as the pins on the socket are very fragile and any damage to them may require replacing the system board. Heatsink 59

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Heatsink
WARNING!
To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to
disconnect the power cord from the wall outlet and allow the internal system components to cool before
touching.
You will need a screwdriver with a narrow shaft to loosen the heatsink screws.
1.
Prepare the computer for disassembly (
Preparation for Disassembly
on page
26
).
2.
Remove the computer access panel (
Computer Access Panel
on page
30
).
3.
Unplug the fan cable from the system board (CPU FAN1).
4.
Using a screwdriver with a narrow shaft, loosen the four silver T15 captive screws that secure the
heatsink to the system board.
NOTE:
The screw closest to the side of the chassis may be difficult to access. You may need to
remove the fan on top of the heatsink to gain access to this screw. To remove the fan, pull back
on the four clips that secure the fan to the heatsink and loosen the fan from the clip.
CAUTION:
Heatsink retaining screws should be removed in diagonally opposite pairs (as in an
X) to even the downward forces on the processor. This is especially important as the pins on the
socket are very fragile and any damage to them may require replacing the system board.
5.
Remove the heatsink from the processor.
When reinstalling the heatsink, make sure that its bottom has been cleaned with an alcohol wipe and
fresh thermal grease has been applied to the top of the processor.
CAUTION:
Heatsink retaining screws should be tightened in diagonally opposite pairs (as in an X) to
evenly seat the heatsink on the processor. This is especially important as the pins on the socket are
very fragile and any damage to them may require replacing the system board.
Heatsink
59