Lenovo ThinkPad X40 User Manual - Page 51

Checking, adapter, operational, charging - will not turn on

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Checkout guide If you suspect a power problem, see the appropriate one of the following power supply checkouts: v "Checking the ac adapter" v "Checking operational charging" v "Checking the battery pack" on page 48 v "Checking the backup battery" on page 48 Checking the ac adapter You are here because the computer fails only when the ac adapter is used: v If the power problem occurs only when the port replicator is used, replace the port replicator. v If the power-on indicator does not turn on, check the power cord of the ac adapter for correct continuity and installation. v If the computer does not charge during operation, go to ″Checking operational charging.″ To check the ac adapter, do the following: 1. Unplug the ac adapter cable from the computer. 2. Measure the output voltage at the plug of the ac adapter cable. See the following figure: 2 1 (16 - 10 V) Pin Voltage (V dc) 1 +15.5 to +17.0 2 Ground 3. If the voltage is not correct, replace the ac adapter. 4. If the voltage is acceptable, do the following: v Replace the system board. v If the problem persists, go to "Product overview" on page 53. Note: Noise from the ac adapter does not always indicate a defect. Checking operational charging To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer. Perform operational charging. If the battery status indicator or icon does not turn on, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon still does not turn on, replace the battery pack. General descriptions 47

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If
you
suspect
a
power
problem,
see
the
appropriate
one
of
the
following
power
supply
checkouts:
v
“Checking
the
ac
adapter”
v
“Checking
operational
charging”
v
“Checking
the
battery
pack”
on
page
48
v
“Checking
the
backup
battery”
on
page
48
Checking
the
ac
adapter
You
are
here
because
the
computer
fails
only
when
the
ac
adapter
is
used:
v
If
the
power
problem
occurs
only
when
the
port
replicator
is
used,
replace
the
port
replicator.
v
If
the
power-on
indicator
does
not
turn
on,
check
the
power
cord
of
the
ac
adapter
for
correct
continuity
and
installation.
v
If
the
computer
does
not
charge
during
operation,
go
to
″
Checking
operational
charging.
″
To
check
the
ac
adapter,
do
the
following:
1.
Unplug
the
ac
adapter
cable
from
the
computer.
2.
Measure
the
output
voltage
at
the
plug
of
the
ac
adapter
cable.
See
the
following
figure:
2
1
(16 - 10 V)
Pin
Voltage
(V
dc)
1
+15.5
to
+17.0
2
Ground
3.
If
the
voltage
is
not
correct,
replace
the
ac
adapter.
4.
If
the
voltage
is
acceptable,
do
the
following:
v
Replace
the
system
board.
v
If
the
problem
persists,
go
to
“Product
overview”
on
page
53.
Note:
Noise
from
the
ac
adapter
does
not
always
indicate
a
defect.
Checking
operational
charging
To
check
whether
the
battery
charges
properly
during
operation,
use
a
discharged
battery
pack
or
a
battery
pack
that
has
less
than
50%
of
the
total
power
remaining
when
installed
in
the
computer.
Perform
operational
charging.
If
the
battery
status
indicator
or
icon
does
not
turn
on,
remove
the
battery
pack
and
let
it
return
to
room
temperature.
Reinstall
the
battery
pack.
If
the
charge
indicator
or
icon
still
does
not
turn
on,
replace
the
battery
pack.
Checkout
guide
General
descriptions
47