Lenovo ThinkCentre M51 Hardware Maintenance Manual - Page 152

correctly.

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Removing and replacing the system board 1. Open the cover. See "Opening the cover" on page 138. 2. While holding the left rear of the computer chassis down, pull upward on the handle provided, to remove the PCI riser card assembly along with any adapters. 3. Disconnect all cables connected to the system board. See "Identifying parts on the system board" on page 140. 4. Using the two blue handles provided, lift the system board assembly out of the computer. Note: You will have to tilt the system board assembly and move it around the edge of the power supply assembly to remove it from the computer. 5. Note the location of the memory modules and remove them from the failing system board and install them on the new system board in the same location as they were on the failing system board. See "Removing and replacing memory" on page 141. 6. Remove the heat sink and microprocessor from the failing system board and install them on the new system board. See "Removing and replacing the microprocessor" on page 147. Continue to the next step after installing the heat sink and microprocessor on the new system board. 7. Install the new system board assembly into the computer chassis by aligning the two tabs on the rear of the system board assembly with the slots in the rear of the computer chassis. Slide the system board assembly to the rear until the front edge of the system board assembly fits behind the flange in the front and is seated flush to the bottom of the chassis. 8. Reconnect all cables that were disconnected from the system board. Make sure all cables are routed correctly. 146 Hardware Maintenance Manual

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Removing
and
replacing
the
system
board
1.
Open
the
cover.
See
“Opening
the
cover”
on
page
138.
2.
While
holding
the
left
rear
of
the
computer
chassis
down,
pull
upward
on
the
handle
provided,
to
remove
the
PCI
riser
card
assembly
along
with
any
adapters.
3.
Disconnect
all
cables
connected
to
the
system
board.
See
“Identifying
parts
on
the
system
board”
on
page
140.
4.
Using
the
two
blue
handles
provided,
lift
the
system
board
assembly
out
of
the
computer.
Note:
You
will
have
to
tilt
the
system
board
assembly
and
move
it
around
the
edge
of
the
power
supply
assembly
to
remove
it
from
the
computer.
5.
Note
the
location
of
the
memory
modules
and
remove
them
from
the
failing
system
board
and
install
them
on
the
new
system
board
in
the
same
location
as
they
were
on
the
failing
system
board.
See
“Removing
and
replacing
memory”
on
page
141.
6.
Remove
the
heat
sink
and
microprocessor
from
the
failing
system
board
and
install
them
on
the
new
system
board.
See
“Removing
and
replacing
the
microprocessor”
on
page
147.
Continue
to
the
next
step
after
installing
the
heat
sink
and
microprocessor
on
the
new
system
board.
7.
Install
the
new
system
board
assembly
into
the
computer
chassis
by
aligning
the
two
tabs
on
the
rear
of
the
system
board
assembly
with
the
slots
in
the
rear
of
the
computer
chassis.
Slide
the
system
board
assembly
to
the
rear
until
the
front
edge
of
the
system
board
assembly
fits
behind
the
flange
in
the
front
and
is
seated
flush
to
the
bottom
of
the
chassis.
8.
Reconnect
all
cables
that
were
disconnected
from
the
system
board.
Make
sure
all
cables
are
routed
correctly.
146
Hardware
Maintenance
Manual