Graphics subsystem heat sink
NOTE: The graphics subsystem heat sink includes a fan and replacement thermal material.
Description Spare part number
For use only on computer models equipped with the NVIDIA Quadro K5100M graphics board 735373-001
For use only on computer models equipped with the NVIDIA Quadro K4100M or K3100M graphics board 735374-001
For use only on computer models equipped with the NVIDIA Quadro K610M graphics board 735375-001
For use only on computer models equipped with the MXM-Emerald graphics board 786687-001
For use only on computer models equipped with the MXM-N15P-15 graphics board 786686-001
For use only on computer models equipped with the MXM-N15P-Q1 graphics board (includes fan) 768730-001
NOTE: To properly ventilate the computer, allow at least a 7.6‑cm (3‑inch) 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 graphics subsystem 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 45).
5. Remove the service cover (see service cover).
6. Remove the optical drive (see Optical drive on page 56) or upgrade bay hard drive (see Upgrade Bay
hard drive on page 58).
7. Remove the keyboard (see Keyboard on page 61).
8. Remove the top cover (see Top cover on page 71)
Remove the graphics subsystem heat sink:
1. If present, release the tape that promotes airflow between the fan and the processor heat sink.
2. Disconnect the fan cable from the system board (1).
3. Following the sequence stamped into the graphics subsystem heat sink, loosen the four captive Torx
screws (2) that secure the graphics subsystem heat sink to the system board.
96 Chapter 6 Removal and replacement procedures for Authorized Service Provider parts
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