System Board - Lenovo ThinkStation P920 Hardware Maintenance Manual

d. Install the microprocessor retainer with the new microprocessor on the heat-sink-and-fan assembly.
Then, install the heat-sink-and-fan assembly on the system board. See "Heat-sink-and-fan
assembly" on page 200.
What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the installation or replacement, go to "Completing the parts replacement" on page 210.

System board

Attention: Do not open your computer or attempt any repair before reading and understanding the Chapter
1 "Read this first: Important safety information" on page 1.
CAUTION:
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.
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. To update the VPD, see
"Updating and recovering the BIOS" on page 73.
• 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.
Figure 189. Do not touch the pins or the gold contacts
To remove or install the system board, do the following:
1. Prepare your computer. See "Preparing your computer and removing the computer cover" on page 103.
2. To remove the system board, do the following:
a. To access the system board, remove the following parts:
• "Direct cooling air baffle" on page 107
• "Power supply assembly" on page 150
• "Front fan assembly" on page 137
• "M.2 solid-state drive holder" on page 140
• "PCIe card" on page 155
• "Super capacitor module" on page 170
• "Full-length PCIe card" on page 163
• "Multi-function brackets" on page 173
.
Chapter 9 Hardware removal and installation
207