Lenovo x3550 M4 Installation And Service Manual page 333

To remove the system board, complete the following steps:
Procedure
1. Read the safety information that begins on "Safety" on page vii, "Handling
static-sensitive devices" on page 36, and "Installation guidelines" on page 33.
2. Turn off the server and any attached devices.
3. Turn off the peripheral devices and disconnect all power cords.
Note: When you replace the system board, you must either update the server
with the latest firmware or restore the pre-existing firmware that the customer
provides on a diskette or CD image. Make sure that you have the latest
firmware or a copy of the pre-existing firmware before you proceed.
4. Pull the power supplies out of the rear of the server, just enough to disengage
them from the server.
5. Remove the cover (see "Removing the cover" on page 36).
6. Remove the air baffle (see "Removing the air baffle" on page 37).
7. Remove all PCI riser-card assemblies and adapters (see "Removing a PCI
riser-card assembly" on page 236 and "Removing an adapter" on page 240).
8. Remove the ServeRAID SAS/SATA controller (see "Removing a ServeRAID
SAS/SATA controller" on page 245).
9. Remove the dual-port network adapter (see "Removing the dual-port network
adapter" on page 252).
10. Remove the memory modules and set them aside on a static-protective surface
for reinstallation (see "Removing a memory module" on page 228).
Note: Make a note of the location of each DIMM as you remove it, so that
you can later reinstall it in the same connector.
11. (Trained technician only) Remove all heat sinks and microprocessors, and set
them aside on a static-protective surface for reinstallation (see "Removing a
microprocessor and heat sink" on page 299).
Notes:
a. Remove the socket covers from the microprocessor sockets on the new
system board and place them on the microprocessor sockets of the system
board you are removing.
b. Do not allow the thermal grease to come in contact with anything, and
keep each heat sink paired with its microprocessor for reinstallation.
Contact with any surface can compromise the thermal grease and the
microprocessor socket. A mismatch between the microprocessor and its
original heat sink can require the installation of a new heat sink.
12. Remove the system battery (see "Removing the system battery" on page 283).
13. Disconnect all cables from the system board. Make a list of each cable as you
disconnect it; you can then use this as a checklist when you install the new
system board (see "Internal cable routing and connectors" on page 193 for
more information).
Attention: Disengage all latches, release tabs or locks on cable connectors
when you disconnect all cables from the system board. Failing to release them
before removing the cables will damage the cable sockets on the system board.
The cable sockets on the system board are fragile. Any damage to the cable
sockets may require replacing the system board.
14. Remove the hot-swap fans (see "Removing a hot-swap fan" on page 257).
Chapter 6. Removing and replacing components
315