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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 371.
If the voltage is not correct, go to the next step.
2. Unplug the AC Adapter cable from the ac power
outlet and wait five minutes or longer to allow the
over-voltage 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 defective adapter.
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
leave it to return to room temperature. Reinstall the
battery pack. If the charge indicator still does not turn on,
replace the battery pack.
Checking the Battery Pack: Battery charging will
not start until the Fuel-Gauge shows that less than 95% of
the total power remains; with this condition the battery
pack will charge to 100% of its capacity. This protects the
battery pack from being overcharged or having a
shortened life.
Do the following:
1. Power-off the computer.
2. Remove the battery pack and measure the voltage
between battery terminals 1 (+) and 4 (−). See the
following figure:
(T)
ThinkPad 760 (9546, 9547) 351