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:
Pin 1: +19 to +20.5V
Pin 2: 0V, Ground
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” on page 88.
If the voltage is not correct, go to the next step.
NOTE: An audible noise from the power adapter does not always indicate a defect.
3.If the
4.If the operational charge does not work, see “Check the Battery Pack” on page 75.
74 | Chapter 4 |