Heat Sink - HP ProDesk 400 G4 Maintenance And Service Manual

Heat sink

CAUTION:
If the computer will power on, before removing the heat sink, turn on the computer until it warms the heat
sink. Warming the fan sink lessens the bond between the heat sink and the processor, thereby making
separating them easier.
Make sure not to pull the processor out of the socket when you lift the heat sink, especially if you cannot
warm the fan sink prior to removal. Inadvertently removing the processor can damage the pins.
The heat sink is secured with three captive Torx screws.
order indicated on the heat sink.
1. Prepare the computer for disassembly
2. Remove the access panel
3. Remove the fan
4. Disconnect the fan cable from the system board (1).
5. Loosen the three captive Torx screws (2) that secure the heat sink to the computer.
6. Remove the heat sink from the computer (3).
CAUTION:
sink to avoid damaging the processor.
To reduce a degradation in thermal performance, be sure not to touch the thermal grease on the surface
of the processor or the heat sink.
To replace the heat sink, reverse the removal procedures.
Thermal grease services the processor (1) and heat sink (2). Thermal pads service the system board
components (3) and heat sink (4).
32 Chapter 4 Removal and replacement procedures
The bond between the heat sink and the processor may be very tight.
(Access panel on page
(Fan on page 31).
Be sure the loosen the screws in the order indicated by the numbers stamped on the heat
(Preparation for disassembly on page
16).
15).