Replacing The System Board - Lenovo ThinkStation S20 4157 Hardware Manual

10. Reconnect the heat sink fan cable.
11. Go to "Completing the FRU replacement" on page 131.

Replacing the system board

CAUTION:
The heat sink, microprocessor, and memory module might be very hot. Turn off
the computer and wait three to five minutes to let the computer cool before
opening the computer cover.
Note: When replacing the system board a new retention module for the
This section provides instructions on how to remove and install the system board.
To replace the system board:
8. Close the microprocessor retainer and clamp it with the small handle.
9. Place the heat sink into position and replace the 4 screws to secure the heat
sink to the system board.
Attention
Do not open your computer or attempt any repair before reading and understanding the
"Important safety information" in the ThinkStation Safety and Warranty Guide that came
with your computer. To obtain a copy of the ThinkStation Safety and Warranty Guide, go to:
http://www.lenovo.com/support
microprocessor heat sink is required. Make sure you have a new retention
module before beginning this procedure.
1. Open the cover. See "Removing the cover" on page 96.
2. Lay the computer on its side for easier access to the system board.
3. Remove the hard disk drive fan. See "Replacing the hard disk drive fan
assembly" on page 121.
4. Remove any adapter cards installed in the PCI connectors. See "Replacing a
PCI adapter card" on page 104.
5. Remove the memory modules from the failing system board.
6. Remove the heat sink from the failing system board. See "Replacing the heat
sink" on page 109.
Chapter 11. Replacing FRUs - Ibiza Computers
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