HP EliteDesk 800 G8 Maintenance and Service Guide - Page 50

Heat sink

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To install the option board, reverse the removal procedure. Heat sink To remove the heat sink, use these procedures. IMPORTANT: The bond between the heat sink and the processor can be very tight. If the computer will turn on, before removing the heat sink, turn on the computer until it warms the heat sink. Warming the heat sink loosens the bond between the heat sink and the processor, thereby making it easier to separate them. Do not pull the processor out of the socket when you lift the heat sink, especially if you cannot warm the heat sink before removal. Inadvertently removing the processor can damage the pins. Before removing the heat sink, follow these steps: 1. Prepare the computer for disassembly (see Preparation for disassembly on page 21). 2. Remove the access panel (see Access panel on page 21). 3. Remove the air duct (see Air duct on page 38. Remove the heat sink: 1. Disconnect the fan cable from the system board (1). 2. In the order indicated on the heat sink, loosen the four captive Torx screws (2). IMPORTANT: Remove heat sink retaining screws in diagonally opposite pairs (as in an X) to evenly seat the downward forces on the processor. The pins on the socket are fragile, and damage to them might require replacing the system board. 3. Remove the heat sink from the computer (3). 42 Chapter 4 Removal and replacement procedures

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To install the option board, reverse the removal procedure.
Heat sink
To remove the heat sink, use these procedures.
IMPORTANT:
The bond between the heat sink and the processor can be very tight.
If the computer will turn on, before removing the heat sink, turn on the computer until it warms the heat sink.
Warming the heat sink loosens the bond between the heat sink and the processor, thereby making it easier to
separate them.
Do not pull the processor out of the socket when you lift the heat sink, especially if you cannot warm the heat
sink before removal. Inadvertently removing the processor can damage the pins.
Before removing the heat sink, follow these steps:
1.
Prepare the computer for disassembly (see
Preparation for disassembly
on page
21
).
2.
Remove the access panel (see
Access panel
on page
21
).
3.
Remove the air duct (see
Air duct
on page
38
.
Remove the heat sink:
1.
Disconnect the fan cable from the system board
(1)
.
2.
In the order indicated on the heat sink, loosen the four captive Torx screws
(2)
.
IMPORTANT:
Remove heat sink retaining screws in diagonally opposite pairs (as in an X) to evenly seat
the downward forces on the processor. The pins on the socket are fragile, and damage to them might
require replacing the system board.
3.
Remove the heat sink from the computer
(3)
.
42
Chapter 4
Removal and replacement procedures