h. Fan (see Fan on page 57)
i. System board (see
System board on page 61)
Remove the power connector cable:
1. Turn the system board upside down, with the front toward you.
2. Disconnect the power cable from the system board.
Reverse this procedure to install the power connector cable.
Heat sink
Description Spare part number
Heat sink for use in models with discrete graphics (includes replacement thermal material) 718431-001
Heat sink for use in models with UMA graphics (includes replacement thermal material) 728409-001
Before removing the heat sink, follow these steps:
1. Turn off 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 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 33) and then remove the following components:
a. Hard drive (see
Hard drive on page 34)
b. WLAN module (see
WLAN module on page 37)
c. Solid-state drive (see
mSATA drive on page 39)
Component replacement procedures 65
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