Lenovo ThinkPad X23 ThinkPad X20, X21, X22, X23, X24 Hardware Maintenance Manu - Page 42
If the voltage is correct, replace the system board., If the backup battery discharges quickly after
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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. 38 ThinkPad X20, X21, X22, X23, X24
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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.
k(-)
Red(+)
Blac
Wire
Voltage (V dc)
Red
+2.5 to +3.2
Black
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.
38
ThinkPad X20, X21, X22, X23, X24