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v
System
board
without
IBM
security
chip
(bottom
view)
Begin
by
checking
the
FRU
number
of
the
system
board,
and
be
sure
to
use
the
correct
system
board
for
the
computer.
For
the
FRU
numbers,
see
“Parts
list”
on
page
190.
Important
If
the
ThinkPad
computer
you
are
servicing
has
a
security
chip,
bear
the
following
in
mind:
v
Do
not
remove
the
security
chip
from
the
system
board.
If
the
security
chip
is
removed
by
accident,
reinstall
it
on
the
system
board
immediately.
Make
sure
that
it
is
firmly
fixed
on
the
system
board
and
does
not
move
easily.
v
The
security
chip
cannot
be
used
with
any
other
system
board.
v
The
system
board
cannot
be
used
with
any
other
security
chip.
v
The
system
board
cannot
be
used
without
the
security
chip.
v
If
you
return
a
defective
system
board,
you
must
check
whether
the
security
chip
is
embedded.
If
it
is
not,
the
board
may
not
be
covered
under
warranty.
Removing
and
replacing
a
FRU
ThinkPad
T40/T40p,
T41/T41p,
T42/T42p
Series
137