Power
system
checkout
To
verify
a
symptom,
do
the
following:
1.
Power
off
the
computer.
2.
Remove
the
battery
pack.
3.
Connect
the
ac
adapter.
4.
Check
that
power
is
supplied
when
you
power
on
the
computer.
5.
Power
off
the
computer.
6.
Disconnect
the
ac
adapter
and
install
the
charged
battery
pack.
7.
Check
that
the
battery
pack
supplies
power
when
you
power
on
the
computer.
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”
on
page
39
v
“Checking
the
battery
pack”
on
page
39
v
“Checking
the
backup
battery”
on
page
40
Checking
the
ac
adapter
You
are
here
because
the
computer
fails
only
when
the
ac
adapter
is
used:
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:
1
2
3
4
Pin
Voltage
(V
dc)
1
Vcc_+
16V
2
Ground
3
Vcc_+
16V
4
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.
Checkout
guide
38
ThinkPad
G40,
G41
Summary of Contents for 2384EHU - ThinkPad G40 2384
Page 1: ...ThinkPad Computer Hardware Maintenance Manual July 2005 This manual supports ThinkPad G40 G41 ...
Page 6: ...2 ThinkPad G40 G41 ...
Page 28: ...Laser compliance statement 24 ThinkPad G40 G41 ...
Page 46: ...Checkout guide 42 ThinkPad G40 G41 ...
Page 150: ...LCD FRUs Parts list 146 ThinkPad G40 G41 ...
Page 163: ...Trademarks ThinkPad G40 G41 159 ...