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Lenovo 7749 Manuel D’Utilisation

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Replacing
 
the
 
system
 
board
 
 
Attention
 
Do
 
not
 
open
 
your
 
computer
 
or
 
attempt
 
any
 
repair
 
before
 
reading
 
and
 
understanding
 
the
 
“Important
 
safety
 
information”
 
in
 
the
 
ThinkCentre
 
Safety
 
and
 
Warranty
 
Guide
 
that
 
came
 
with
 
your
 
computer.
 
To
 
obtain
 
a
 
copy
 
of
 
the
 
ThinkCentre
 
Safety
 
and
 
Warranty
 
Guide,
 
go
 
to:
http://www.lenovo.com/support
  
This
 
section
 
provides
 
instructions
 
on
 
how
 
to
 
replace
 
the
 
system
 
board.
 
 
CAUTION:
 
  
  
The
 
heat
 
sink
 
and
 
microprocessor
 
might
 
be
 
very
 
hot.
 
Turn
 
off
 
the
 
computer
 
and
 
wait
 
three
 
to
 
five
 
minutes
 
to
 
let
 
the
 
computer
 
cool
 
before
 
removing
 
the
 
computer
 
cover.
Note:
  
When
 
replacing
 
the
 
system
 
board,
 
you
 
must
 
order
 
a
 
new
 
retention
 
module
 
for
 
the
 
new
 
system
 
board.
 
Make
 
sure
 
you
 
have
 
a
 
retention
 
module
 
for
 
the
 
new
 
system
 
board
 
before
 
continuing
 
this
 
procedure.
 
To
 
replace
 
the
 
system
 
board:
 
 
1.
   
Remove
 
the
 
computer
 
cover.
 
See
 
 
2.
   
Remove
 
the
 
primary
 
hard
 
disk
 
drive
 
with
 
the
 
hard
 
disk
 
drive
 
cage.
 
See
 
 
3.
   
Lay
 
the
 
computer
 
on
 
its
 
side
 
to
 
make
 
the
 
system
 
board
 
more
 
accessible.
 
 
4.
   
Remove
 
all
 
memory
 
modules
 
and
 
adapter
 
cards
 
that
 
are
 
currently
 
installed.
 
See
 
and
 
 
5.
   
Carefully
 
take
 
note
 
of
 
the
 
location
 
of
 
all
 
cable
 
connectors
 
on
 
the
 
system
 
board
 
and
 
disconnect
 
all
 
the
 
cables.
 
See
 
 
6.
   
Remove
 
the
 
heat
 
sink
 
and
 
fan
 
assembly
 
from
 
the
 
failing
 
system
 
board.
 
See
 
 
7.
   
Remove
 
the
 
screws
 
that
 
secure
 
the
 
system
 
board
 
to
 
the
 
chassis.
 
 
8.
   
Carefully
 
move
 
the
 
system
 
board
 
out
 
of
 
the
 
chassis.
 
 
9.
   
Remove
 
the
 
microprocessor
 
socket
 
cover
 
from
 
the
 
new
 
system
 
board.
 
10.
   
Remove
 
the
 
microprocessor
 
from
 
the
 
failing
 
system
 
board
 
and
 
install
 
it
 
on
 
the
 
new
 
system
 
board.
 
See
 
11.
   
The
 
failing
 
system
 
board
 
must
 
be
 
returned
 
with
 
a
 
microprocessor
 
socket
 
cover
 
to
 
protect
 
the
 
pins
 
during
 
shipping
 
and
 
handling.
 
Install
 
the
 
microprocessor
 
socket
 
cover
 
removed
 
from
 
the
 
new
 
system
 
board
 
on
 
the
 
failing
 
system
 
board.
 
To
 
install
 
the
 
microprocessor
 
socket
 
cover:
 
a.
   
Make
 
sure
 
the
 
microprocessor
 
has
 
been
 
removed
 
from
 
the
 
microprocessor
 
socket,
 
and
 
then
 
close
 
the
 
microprocessor
 
retainer
 
and
 
lock
 
it
 
into
 
position
 
with
 
the
 
small
 
handle.
 
 
Chapter
 
8.
 
Replacing
 
FRUs
 
-
 
Tamdhu
 
computers
 
103