Lenovo
G400s - G405s - G400s Touch - G500s - G505s - G500s: To verify a symptom, follow the steps below:
1.
Turn off the computer.
2.
Remove the battery pack.
3.
Connect the AC adapter.
4.
Make sure that power is supplied when you turn on the computer.
5.
Turn off the computer.
6.
Disconnect the AC adapter and install the charged battery pack.
7.
Make sure that the battery pack supplies power when you turn on the computer.
If
you suspect a power problem, see the appropriate one of the following power
supply
checkouts:
“Checking
the AC adapter”
“Checking
operational charging”
“Checking
the battery pack”
Checking
the AC adapter
You
are here because the computer fails only when the AC adapter is used.
If
the power-on indicator does not turn on, check the power cord of the AC adapter
for correct continuity and installation.
To
check the AC adapter, follow the steps below:
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:
Note:
Output voltage for the AC adapter pin No. 2 may differ from the one you are
servicing.
3.
If the voltage is not correct, replace the AC adapter.
4.
If the voltage is acceptable, do the following:
Replace
the system board.
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 light
on, remove the battery pack and let it return to room temperature. Reinstall
the battery pack. If the charge indicator or icon is still off, replace the
battery pack.
If
the charge indicator still does not light on, replace the system board. Then
reinstall the battery pack. If it is still not charged, go to the next section.
Checking
the battery pack
Battery
charging does not start until the Power Meter shows that less than 95% of the
total power remains; under this condition the battery pack can charge to 100%
of its capacity. This protects the battery pack from being overcharged or from
having a shortened life.
To
check your battery, move your cursor to the Power Meter icon in the icon tray
of the Windows taskbar and wait for a moment (but do not click it), and the
percentage of battery power remaining is displayed. To get detailed information
about the battery, double-click the Power Meter icon.
Note:
If the battery pack becomes hot, it may not be able to be charged. Remove it
from the computer and leave it at room temperature for a while. After it cools
down, reinstall and recharge it.
To
check the battery pack, follow the steps below:
1.
Turn off the computer.
2.
Remove the battery pack and measure the voltage between battery terminals
1
(+) and 7 (-). See the following figure:
3.
If the voltage is less than +11.0 V DC, the battery pack has been discharged.
Note:
Recharging will be continued for at least 3 hours, even though the indicator
does not light on.
If
the voltage is still less than +11.0 V DC after recharging, replace the
battery.
4.
If the voltage is more than +11.0 V DC, measure the resistance between battery
terminals 5 and 7. The resistance must be 4 to 30 KΩ. If the resistance is not
correct, replace the battery pack. If the resistance is correct, replace the
system board.
Battery
pack
Unlock
the manual latch 1. Slide the spring-loaded latch to the unlocked position 2 to
eject the battery pack. Lift up the inner edge3 of the battery pack, pivoting
it on the outer edge. Slide the battery pack in the indicated direction 4 to
remove it.
