Lenovo 0768AFU User Manual - Page 47

Intermittent, problems, Undetermined

Get Lenovo 0768AFU PDF manuals and user guides View all Lenovo 0768AFU manuals
Add to My Manuals
Save this manual to your list of manuals

Page 47 highlights

Symptom-to-FRU index Intermittent problems Intermittent system hang problems can be due to a variety of causes that have nothing to do with a hardware defect, such as cosmic radiation, electrostatic discharge, or software errors. FRU replacement should be considered only when a problem recurs. When analyzing an intermittent problem, do the following: 1. Run the diagnostic test for the system board in loop mode at least 10 times. 2. If no error is detected, do not replace any FRUs. 3. If any error is detected, replace the FRU shown by the FRU code. Rerun the test to verify that no more errors exist. Undetermined problems If the diagnostic tests did not identify the adapter or device that has failed, if wrong devices are installed, or if the system simply is not operating, follow these procedures to isolate the failing FRU (do not isolate FRUs that have no defects). Verify that all attached devices are supported by the computer. Verify that the power supply being used at the time of the failure is operating correctly. (See "Power system checkout" on page 26.) 1. Turn off the computer. 2. Visually check each FRU for damage. Replace any damaged FRU. 3. Remove or disconnect all of the following devices: a. Non-Lenovo 3000 devices b. Devices attached to the port replicator c. Printer, mouse, and other external devices d. Battery pack e. Hard disk drive f. External diskette drive or optical drive g. DIMM h. Optical disk or diskette in the internal drive i. PC Cards 4. Turn on the computer. 5. Determine whether the problem has been solved. 6. If the problem does not recur, reconnect the removed devices one at a time until you find the failing FRU. 7. If the problem remains, replace the following FRUs one at a time (do not replace a nondefective FRU): a. System board b. LCD assembly Lenovo 3000 N100 and N200 41

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
  • 57
  • 58
  • 59
  • 60
  • 61
  • 62
  • 63
  • 64
  • 65
  • 66
  • 67
  • 68
  • 69
  • 70
  • 71
  • 72
  • 73
  • 74
  • 75
  • 76
  • 77
  • 78
  • 79
  • 80
  • 81
  • 82
  • 83
  • 84
  • 85
  • 86
  • 87
  • 88
  • 89
  • 90
  • 91
  • 92
  • 93
  • 94
  • 95
  • 96
  • 97
  • 98
  • 99
  • 100
  • 101
  • 102
  • 103
  • 104
  • 105
  • 106
  • 107
  • 108
  • 109
  • 110
  • 111
  • 112
  • 113
  • 114
  • 115
  • 116
  • 117
  • 118
  • 119
  • 120
  • 121
  • 122
  • 123
  • 124
  • 125
  • 126
  • 127
  • 128
  • 129
  • 130
  • 131
  • 132
  • 133
  • 134
  • 135
  • 136
  • 137
  • 138
  • 139
  • 140
  • 141
  • 142
  • 143
  • 144
  • 145
  • 146
  • 147
  • 148
  • 149
  • 150
  • 151
  • 152
  • 153
  • 154
  • 155
  • 156
  • 157
  • 158
  • 159
  • 160
  • 161
  • 162
  • 163
  • 164
  • 165
Intermittent
problems
Intermittent
system
hang
problems
can
be
due
to
a
variety
of
causes
that
have
nothing
to
do
with
a
hardware
defect,
such
as
cosmic
radiation,
electrostatic
discharge,
or
software
errors.
FRU
replacement
should
be
considered
only
when
a
problem
recurs.
When
analyzing
an
intermittent
problem,
do
the
following:
1.
Run
the
diagnostic
test
for
the
system
board
in
loop
mode
at
least
10
times
.
2.
If
no
error
is
detected,
do
not
replace
any
FRUs.
3.
If
any
error
is
detected,
replace
the
FRU
shown
by
the
FRU
code.
Rerun
the
test
to
verify
that
no
more
errors
exist.
Undetermined
problems
If
the
diagnostic
tests
did
not
identify
the
adapter
or
device
that
has
failed,
if
wrong
devices
are
installed,
or
if
the
system
simply
is
not
operating,
follow
these
procedures
to
isolate
the
failing
FRU
(do
not
isolate
FRUs
that
have
no
defects).
Verify
that
all
attached
devices
are
supported
by
the
computer.
Verify
that
the
power
supply
being
used
at
the
time
of
the
failure
is
operating
correctly.
(See
“Power
system
checkout”
on
page
26.)
1.
Turn
off
the
computer.
2.
Visually
check
each
FRU
for
damage.
Replace
any
damaged
FRU.
3.
Remove
or
disconnect
all
of
the
following
devices:
a.
Non-Lenovo
3000
devices
b.
Devices
attached
to
the
port
replicator
c.
Printer,
mouse,
and
other
external
devices
d.
Battery
pack
e.
Hard
disk
drive
f.
External
diskette
drive
or
optical
drive
g.
DIMM
h.
Optical
disk
or
diskette
in
the
internal
drive
i.
PC
Cards
4.
Turn
on
the
computer.
5.
Determine
whether
the
problem
has
been
solved.
6.
If
the
problem
does
not
recur,
reconnect
the
removed
devices
one
at
a
time
until
you
find
the
failing
FRU.
7.
If
the
problem
remains,
replace
the
following
FRUs
one
at
a
time
(do
not
replace
a
nondefective
FRU):
a.
System
board
b.
LCD
assembly
Symptom-to-FRU
index
Lenovo
3000
N100
and
N200
41