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If the power on indicator does not turn on, check the
power cord of the AC Adapter for correct continuity
and installation.
If the operational charge does not work, go to
“Checking Operational Charging.”
1. Unplug the AC Adapter cable from the computer and
measure the output voltage at the plug of the AC
Adapter cable. See the following figure:
If the voltage is correct, make sure the
connection between DC/DC card and system
board is not loose.
Replace the DC/DC card.
If the problem is not corrected, replace the
system board.
If the problem is still not corrected, go to
“Undetermined Problems” on page 447.
If the voltage is not correct, go to the next step.
2. Unplug the AC Adapter cable from the ac power
outlet and wait 5 minutes or longer to allow the
overvoltage protection circuit to be fully discharged
and initialized.
3. Plug the AC Adapter cable into the ac power outlet.
4. Measure the output voltage of the AC Adapter.
5. If the voltage is still not correct, replace the AC
Adapter.
Note: An audible noise from the AC Adapter does not
always indicate a defect.
Checking Operational Charging: To check
operational charging, use a discharged battery pack or a
battery pack that has less than 50% of the total power
remaining when installed in the computer.
Perform operational charging. If the battery status
indicator does not turn on, remove the battery pack and let
it return to room temperature. Reinstall the battery pack.
If the charge indicator still does not turn on, replace the
battery pack.
Pin Voltage (V dc)
1 +15.5 to +17.0
2 Ground
ThinkPad 765D (9546), 765L (9547) 423