Lenovo ThinkCentre M70q, Hardware Maintenance Manual, Page: 73 / 80

System board
Prerequisite
Before you start, read Chapter 1 “Important safety information” on page 1 and print the following
instructions.
Avoid contact with hot components inside the computer. During operation, some components become hot
enough to burn the skin. Before you open the computer cover, turn off the computer, disconnect power, and
wait approximately 10 minutes for the components to cool.
The heat-sink-and-fan assembly and microprocessor might be very hot. Before you open the computer
cover, turn off the computer and wait several minutes until the computer is cool.
Notes:
• Each computer has a unique Vital Product Data (VPD) code stored in the nonvolatile memory on the
system board. After you replace the system board, the VPD must be updated.
• Your microprocessor sockets and socket covers might look slightly different from the illustrations in this
topic.
• Do not touch the pins on the microprocessor socket or the gold contacts on the microprocessor.
System board replacement procedure
1. Remove the computer cover. See “Computer cover” on page 44.
2. Remove the bottom cover. See “Bottom cover” on page 54.
3. To get access to the system board, remove the following parts if any:
a. “Internal speaker” on page 46.
b. “System fan” on page 47.
c. “Heat sink” on page 60.
d. “Coin-cell battery” on page 48.
e. “Storage drive” on page 50.
f. “Front Wi-Fi antenna and cable” on page 61.
g. “Wi-Fi card” on page 52.
h. “Memory module” on page 55.
i. “M.2 solid-state drive” on page 56.
4. Record the cable routing and cable connections, and then disconnect all cables from the system board.
See “System board” on page 34.
5. Remove the six screws that secure the system board, and then carefully lift the system board out of the
chassis.
Chapter 4
.
Hardware removal and installation
67