Lenovo E40 Remove the backup battery see “1120 Backup battery” on page, Red + Black, +2.5 to +3.2

4.Remove the backup battery (see “1120 Backup battery” on page 98).

5.Measure the voltage of the backup battery. See the following figure.

Red (+)

Black (-)

Wire	Voltage (V dc)
Red	+2.5 to +3.2
Black	Ground

vIf the voltage is correct, replace the system board.

vIf the voltage is not correct, replace the backup battery.

vIf the backup battery discharges quickly after replacement, replace the system board.

General checkout 55