Lenovo ThinkCentre M55e Hardware Maintenance Manual - Page 96

Replacing, system, board

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Replacing the system board 1. Turn off the computer and allow the computer to cool for one hour. 2. Open the computer cover. See "Opening the cover" on page 83. 3. Pivot the drive bay assembly upward to gain access to the system board. 4. While holding the rear of the computer chassis down, pull upward on the handle provided to remove the PCI riser assembly and any adapters that are currently installed. 5. Carefully take note of the location of all cable connections on the system board. It will be necessary to reconnect them properly when installing a new system board. Important Note the cable routing. It is important to route the cables the same way after you install the new system board. 6. Disconnect all cables connected to the system board. See "Identifying parts on the system board" on page 85. 7. Pull upward on the handle 1 to release the system board from the front latch, slide the system board toward the drive bay assembly, and then carefully lift the system board out of the chassis. Note: You might have to tilt the front end of the system board between the diskette drive and the fan assembly to remove it completely from the chassis. 90 Hardware Maintenance Manual

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Replacing
the
system
board
1.
Turn
off
the
computer
and
allow
the
computer
to
cool
for
one
hour.
2.
Open
the
computer
cover.
See
“Opening
the
cover”
on
page
83.
3.
Pivot
the
drive
bay
assembly
upward
to
gain
access
to
the
system
board.
4.
While
holding
the
rear
of
the
computer
chassis
down,
pull
upward
on
the
handle
provided
to
remove
the
PCI
riser
assembly
and
any
adapters
that
are
currently
installed.
5.
Carefully
take
note
of
the
location
of
all
cable
connections
on
the
system
board.
It
will
be
necessary
to
reconnect
them
properly
when
installing
a
new
system
board.
Important
Note
the
cable
routing.
It
is
important
to
route
the
cables
the
same
way
after
you
install
the
new
system
board.
6.
Disconnect
all
cables
connected
to
the
system
board.
See
“Identifying
parts
on
the
system
board”
on
page
85.
7.
Pull
upward
on
the
handle
±1²
to
release
the
system
board
from
the
front
latch,
slide
the
system
board
toward
the
drive
bay
assembly,
and
then
carefully
lift
the
system
board
out
of
the
chassis.
Note:
You
might
have
to
tilt
the
front
end
of
the
system
board
between
the
diskette
drive
and
the
fan
assembly
to
remove
it
completely
from
the
chassis.
90
Hardware
Maintenance
Manual