HP 15 Notebook PC - Maintenance and Service Guide

Heat sink assembly
Description Spare part number
Heat sink for use with Intel Core processors 742581-001
Heat sink for use in computers with Intel Pentium N3540, Celeron N2940, and Celeron N2840 processors 749040-001
Heat sink for use in computers with Intel Celeron N3150 and N3050 processors 828173-001
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
aected by high external temperatures, system power consumption, power management/battery
conservation congurations, 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/heat sink assembly, follow these steps:
1. Turn o the computer. If you are unsure whether the computer is o or in Hibernation, turn
the computer on, and then shut it down through the operating system.
2. Disconnect the power from the computer by unplugging the power cord from the computer.
3. Disconnect all external devices from the computer.
4. Remove the battery (see Battery on page 28), and then remove the following components:
a. Optical drive (see Optical drive on page 33).
b. Service door (see Service door on page 29).
c. WLAN module (see WLAN module on page 31).
d. Memory module (see Memory module on page 30).
e. Keyboard (see Keyboard on page 38).
f. Top cover (see Top cover on page 40).
g. Hard drive (see Hard drive on page 44).
h. System board (see System board on page 52).
Remove the heat sink assembly:
1. Turn the system board upside down, with the front toward you.
2. Disconnect the fan cable from the system board.
3. Following the 1, 2, 3, 4 sequence stamped into the fan/heat sink assembly, loosen the four Phillips
M2.0×10.0 captive screws (1) that secure the fan/heat sink assembly to the system board.
Component replacement procedures 61