Serial board
Description Spare part number
Serial board (select products only) 840746-001
IMPORTANT: Make special note of each screw and screw lock size and location during removal and
replacement
Before removing the serial board, 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 following components:
a. Service door (see Service door on page 37).
b. Remove the battery (see Battery on page 38)
c. Hard drive (see Hard drive on page 39).
d. Solid-state drive (see Solid-state drive (select products only) on page 41).
e. WWAN module (see WWAN module (select products only) on page 42).
f. WLAN module (see WLAN module on page 43).
g. Optical drive (see Optical drive on page 45).
h. Keyboard (see Keyboard on page 47).
i. Hinge covers (see Hinge cover on page 53).
j. Base enclosure (see Base enclosure on page 55).
k. System board (see System board on page 57).
l. Fan/heat sink assembly (see Fan and heat sink assembly on page 59).
m. Top cover (see Top cover and TouchPad on page 63).
Remove the serial board:
▲
Remove 2 M2x3L P1 screws(1), remove the cable from the routing channels (2), and then remove the
serial board (3).
78 Chapter 5 Removal and replacement procedures for Authorized Service Provider parts
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