Power System Check

To verify the symptom of the problem, power on the computer using each of the following power sources:

  1. Remove the battery pack.
  2. Connect the power adapter and check that power is supplied.
  3. Disconnect the power adapter and install the charged battery pack; then check that power is supplied by the battery pack.

If you suspect a power problem, see the appropriate power supply check in the following list:

  • quot;Check the Power Adapter."
  • quot;Check the Battery Pack."

Check the Power Adapter

Unplug the power adapter cable from the computer and measure the output voltage at the plug of the power adapter cable. See the following figure

  1. If the voltage is not correct, replace the power adapter.
  2. If the voltage is within the range, do the following:
  • Replace the System board.
  • If the problem is not corrected, see "Undetermined Problems".
  • If the voltage is not correct, go to the next step.

Note: An audible noise from the power adapter does not always indicate

  1. If the power problem occurs only when the port replicator is used, replace the port replicator.
  2. If the power-on indicator does not light up, check the power cord of the power adapter for correct continuity and installation.
  3. If the operational charge does not work, see "Check the Battery Pack".

Check the Battery Pack

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 2(+) and 7(ground). See the following figure

a defect.

3. If the voltage is still less than 8.0 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. Reinstall the battery pack.

If the charge indicator still does not light up, replace the battery pack. If the charge indicator still does not light up, replace the DC/DC charger board.

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