Lenovo J105 Hardware Maintenance Manual - Page 102

replacement.

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20. Connect all the cables to the system board. See "Identifying parts on the system board" on page 85 21. Go to "Completing the FRU replacement." on page 111. Replacing the system board (Types 8257, 8258, and 8259) 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 only the left-side cover. See "Removing the covers" on page 82. 2. Lay the computer on the right side to make the system board accessible. 3. Remove any adapter cards installed in the PCI connectors. See "Replacing a PCI adapter" on page 90. 4. Carefully 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 85. 5. Remove the screws that secure the system board to the chassis. 6. Lift the system board out of the chassis. 7. Remove the memory modules from the failing system board and install them in the same location on the new system board. 8. Rotate handle 1 to release the heat sink clamp and then disengage the clamp from the plastic retention bracket. 9. Lift the heat sink and fan assembly off the failing system board. Lay the heat sink on its side so that the thermal grease does not come in contact with anything. 96 Lenovo 3000 J Series

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20.
Connect
all
the
cables
to
the
system
board.
See
“Identifying
parts
on
the
system
board”
on
page
85
21.
Go
to
“Completing
the
FRU
replacement.”
on
page
111.
Replacing
the
system
board
(Types
8257,
8258,
and
8259)
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
only
the
left-side
cover.
See
“Removing
the
covers”
on
page
82.
2.
Lay
the
computer
on
the
right
side
to
make
the
system
board
accessible.
3.
Remove
any
adapter
cards
installed
in
the
PCI
connectors.
See
“Replacing
a
PCI
adapter”
on
page
90.
4.
Carefully
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
85.
5.
Remove
the
screws
that
secure
the
system
board
to
the
chassis.
6.
Lift
the
system
board
out
of
the
chassis.
7.
Remove
the
memory
modules
from
the
failing
system
board
and
install
them
in
the
same
location
on
the
new
system
board.
8.
Rotate
handle
±1²
to
release
the
heat
sink
clamp
and
then
disengage
the
clamp
from
the
plastic
retention
bracket.
9.
Lift
the
heat
sink
and
fan
assembly
off
the
failing
system
board.
Lay
the
heat
sink
on
its
side
so
that
the
thermal
grease
does
not
come
in
contact
with
anything.
96
Lenovo
3000
J
Series