IBM X22, X23, X24, X20, X21 manual Turn the computer upside down

2.Turn the computer upside down.

3.Remove the backup battery (see “1030 Backup battery” on page 60).

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

Red(+)

Black(-)

Wire

Red

Black

Voltage (V dc)

+2.5 to +3.2

Ground

a.If the voltage is correct, replace the system board.

b.If the voltage is not correct, replace the backup battery.

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

38ThinkPad X20, X21, X22, X23, X24