Lenovo 50382NU, Hardware Maintenance Manual

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Note: Output voltage of pin no.2 of the ac power adapter may different from the one you are servicing.
3. If the voltage is not correct, replace the ac power adapter.
4. If the voltage is acceptable, do the following:
• Replace the system board.
• If the problem persists, go to “FRU tests” on page 27.
Note: Noise from the ac power 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, replace the battery pack.
If the charge indicator still does not turn on, replace the system board.
Checking the battery pack
Battery charging does not start until the Power Manager Battery Gauge shows that less than 96% 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 Manager Battery Gauge icon in the icon tray of the
Windows taskbar and wait for a moment (but do not click), and the percentage of battery power remaining
is displayed. To get detailed information about the battery, double-click the Power Manager Battery
Gauge icon.
Check the main battery status good or not by using Power Manager. Make sure that the power scheme in
Power Manager is
Always Fully charge .
Checking the backup battery
Do the following:
1. Disable the battery pack in UEFI BIOS (see “1000 Disabling the battery pack in UEFI BIOS” on page 48).
2. Remove the backup battery (see “1040 Backup battery” on page 54).
3. Measure the voltage of the backup battery. See the following figure.
Wire
Voltage (V dc)
Red +2.5 to +3.2
Black Ground
Red (+)
Black (-)
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the backup battery.
• If the backup battery discharges quickly after replacement, replace the system board.
Chapter 3
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