Lenovo J105 Hardware Maintenance Manual - Page 105

Replacing, microprocessor, Types

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Replacing the microprocessor (Types 8252, 8253, 8254, 8255, and 8256) Note: A thermal grease syringe is required to complete the microprocessor installation. Make sure the grease syringe is available before beginning the procedure. The FRU number for the thermal grease is 91P8835. 1. Remove the left-side cover. See "Removing the covers" on page 82. 2. Lay the computer on the right side to make the system board and microprocessor accessible. 3. Disconnect the heat sink and fan assembly cable from the system board. See "Identifying parts on the system board" on page 85. 4. Remove the four 1 screws securing the heat sink and fan assembly to the system board. Notice that there is a retention bracket on the back side of the system board. 5. 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 touch anything. 6. To remove the microprocessor 2 from the failing system board, lift the small handle 3 and open the retainer 1 . Chapter 8. Replacing FRUs (Types 8252, 8253, 8254, 8255, 8256, 8257, 8258, and 8259) 99

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Replacing
the
microprocessor
(Types
8252,
8253,
8254,
8255,
and
8256)
Note:
A
thermal
grease
syringe
is
required
to
complete
the
microprocessor
installation.
Make
sure
the
grease
syringe
is
available
before
beginning
the
procedure.
The
FRU
number
for
the
thermal
grease
is
91P8835.
1.
Remove
the
left-side
cover.
See
“Removing
the
covers”
on
page
82.
2.
Lay
the
computer
on
the
right
side
to
make
the
system
board
and
microprocessor
accessible.
3.
Disconnect
the
heat
sink
and
fan
assembly
cable
from
the
system
board.
See
“Identifying
parts
on
the
system
board”
on
page
85.
4.
Remove
the
four
±1²
screws
securing
the
heat
sink
and
fan
assembly
to
the
system
board.
Notice
that
there
is
a
retention
bracket
on
the
back
side
of
the
system
board.
5.
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
touch
anything.
6.
To
remove
the
microprocessor
±2²
from
the
failing
system
board,
lift
the
small
handle
±3²
and
open
the
retainer
±1²
.
Chapter
8.
Replacing
FRUs
(Types
8252,
8253,
8254,
8255,
8256,
8257,
8258,
and
8259)
99