LG Electronics LM50 service manual Terminal Voltage V dc Ground

Ch4. Symptom-to-part index

·To check the battery pack, do the following :

1.Power off the computer.

2.Remove the battery pack and measure the voltage between battery terminals 1(-) and 5(+). See the following figure :

5(+) 4 3 2 1(-)

Terminal	Voltage (V dc)
1	Ground(-)
5	+0V ~ +12.6V
	(6 cell / 9-cell)

3.If the voltage is still less than +11.1 V DC after recharging, replace the battery.

4.If the voltage is more than +11.1 V DC, measure the resistance between battery terminals 1 and 2. The resistance must be 2 to 4 (typically 3 ).

5.If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.

Note

Charging will take at least 3 hours.

Note

Battery is an expendable supplier, so its capacity and used time can be reduced by using the computer.

·Checking the backup battery

1.Remove the backup battery.

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

White (+)

Wire

Voltage (V dc)

White

+2.5 ~ +3.2

Blue (+)

Blue

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.

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