Lenovo ThinkPad T431s Hardware Maintenance Manual - Page 34

Disable the built-in battery. See Disabling the built-in battery

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Page 34 highlights

1. Disable the built-in battery. See "Disabling the built-in battery" on page 56. 2. Remove the backup battery. See "1070 Battery pack" on page 63. 3. Measure the voltage of the backup battery. See the following illustration. Wire Red Black Voltage (V dc) +2.5 to +3.2 Ground • 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. 28 Hardware Maintenance Manual

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1. Disable the built-in battery. See “Disabling the built-in battery” on page 56.
2. Remove the backup battery. See “1070 Battery pack” on page 63.
3. Measure the voltage of the backup battery. See the following illustration.
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
Ground
•
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.
28
Hardware Maintenance Manual