Important
service
information
17
Use
the
following
strategy
to
prevent
unnecessary
expense
for
replacing
and
servicing
FRUs:
•
If
you
are
instructed
to
replace
an
FRU,
but
the
replacement
does
not
solve
the
problem,
reinstall
the
original
FRU
before
you
continue.
•
Some
computers
have
both
a
processor
board
and
a
main
board.
If
you
are
instructed
to
replace
either
of
them,
and
replacing
one
of
them
does
not
solve
the
problem,
reinstall
that
board,
and
then
replace
the
other
one.
•
If
an
adapter
or
a
device
consists
of
more
than
one
FRU,
any
of
the
FRUs
may
be
the
cause
of
the
error.
Before
replacing
the
adapter
or
device,
remove
the
FRUs
one
by
one
to
see
if
the
symptoms
change.
Replace
only
the
FRU
that
changed
the
symptoms.
Attention:
The
setup
configuration
on
the
computer
you
are
servicing
may
have
been
customized.
Running
Automatic
Configuration
may
alter
the
settings.
Note
the
current
configuration
settings
(using
the
View
Configuration
option);
then,
when
service
has
been
completed,
verify
that
those
settings
remain
in
effect.
Important notice for replacing a main board
Some
components
mounted
on
a
main
board
are
very
sensitive.
Improper
handling
can
cause
damage
to
those
components,
and
may
cause
a
system
malfunction.
Attention:
When
handling
a
main
board:
•
Do
not
drop
the
main
board
or
apply
any
excessive
force
to
it.
•
Avoid
rough
handling
of
any
kind.
•
Avoid
bending
the
main
board
and
hard
pushing
to
prevent
cracking
at
each
BGA
(Ball
Grid
Array)
chipset.
