Lenovo J105 Hardware Maintenance Manual - Page 135

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Replacing the system board (Types 8458, 8459, and 8460) Note: When replacing the system board, a new retention bracket for the microprocessor heat sink is required. Make sure you have a new retention bracket before beginning this procedure. 1. Remove the cover. See "Removing the cover" on page 114. 2. Lift the fan duct off the heat sink fan. 3. Remove any adapter cards installed in the PCI connectors. See "Replacing a PCI adapter" on page 121. 4. Remove the drive bay assembly. See "Removing and replacing the drive bay assembly" on page 119. 5. Take note of the location of all cable connections on the system board and disconnect all cables. See "Identifying parts on the system board" on page 116. 6. Remove the hard disk drive. See "Replacing the hard disk drive" on page 139. 7. Remove the screws that secure the system board to the chassis. 8. Lift the system board out of the chassis. 9. Remove the memory modules from the failing system board and install them in the same location on the new system board. 10. Disconnect the heat sink and fan assembly cable from the system board. See "Identifying parts on the system board" on page 116. 11. Rotate handle 1 to release the heat sink clamp and then disengage the clamp from the plastic retention bracket. 12. Lift the heat sink and fan assembly off the failing system board. Chapter 9. Replacing FRUs (Types 8453, 8454, 8455, 8456, 8457, 8458, 8459, and 8460) 129

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Replacing
the
system
board
(Types
8458,
8459,
and
8460)
Note:
When
replacing
the
system
board,
a
new
retention
bracket
for
the
microprocessor
heat
sink
is
required.
Make
sure
you
have
a
new
retention
bracket
before
beginning
this
procedure.
1.
Remove
the
cover.
See
“Removing
the
cover”
on
page
114.
2.
Lift
the
fan
duct
off
the
heat
sink
fan.
3.
Remove
any
adapter
cards
installed
in
the
PCI
connectors.
See
“Replacing
a
PCI
adapter”
on
page
121.
4.
Remove
the
drive
bay
assembly.
See
“Removing
and
replacing
the
drive
bay
assembly”
on
page
119.
5.
Take
note
of
the
location
of
all
cable
connections
on
the
system
board
and
disconnect
all
cables.
See
“Identifying
parts
on
the
system
board”
on
page
116.
6.
Remove
the
hard
disk
drive.
See
“Replacing
the
hard
disk
drive”
on
page
139.
7.
Remove
the
screws
that
secure
the
system
board
to
the
chassis.
8.
Lift
the
system
board
out
of
the
chassis.
9.
Remove
the
memory
modules
from
the
failing
system
board
and
install
them
in
the
same
location
on
the
new
system
board.
10.
Disconnect
the
heat
sink
and
fan
assembly
cable
from
the
system
board.
See
“Identifying
parts
on
the
system
board”
on
page
116.
11.
Rotate
handle
±1²
to
release
the
heat
sink
clamp
and
then
disengage
the
clamp
from
the
plastic
retention
bracket.
12.
Lift
the
heat
sink
and
fan
assembly
off
the
failing
system
board.
Chapter
9.
Replacing
FRUs
(Types
8453,
8454,
8455,
8456,
8457,
8458,
8459,
and
8460)
129