781. Power off the computer.2. Remove the battery pack and measure the voltage between battery terminals 1(ground) and 7(BT+). Seethe following figure3. If the voltage is still less than 7.2 Vdc after recharging, replace the battery.To check the battery charge operation, use a discharged battery pack or a battery pack that has less than 50%of the total power remaining when installed in the computer.If the battery status indicator does not light up, remove the battery pack and let it return to room temperature.Re-install the battery pack.If the charge indicator still does not light up, replace the battery pack. If the charge indicator still does not lightup, replace the main board.Touchpad CheckIf the touchpad doesn’t work, do the following actions one at a time to correct the problem. Do not replace anon-defective FRU:1. Reconnect the touchpad cables.2. Replace the touchpad.3. Replace the main board.After you use the touchpad, the pointer drifts on the screen for a short time. This self-acting pointer movementcan occur when a slight, steady pressure is applied to the touchpad pointer. This symptom is not a hardwareproblem. No service actions are necessary if the pointer movement stops in a short period of time.1452367
