Thinkpad T500 and W500 Hardware Maintenance Manual - Lenovo
Thinkpad T500 and W500 Hardware Maintenance Manual - Lenovo
Thinkpad T500 and W500 Hardware Maintenance Manual - Lenovo
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Power system checkout<br />
To verify a symptom, do the following:<br />
1. Turn off the computer.<br />
2. Remove the battery pack.<br />
3. Connect the ac adapter.<br />
4. Check that power is supplied when you turn on the computer.<br />
5. Turn off the computer.<br />
6. Disconnect the ac adapter <strong>and</strong> install the charged battery pack.<br />
7. Check that the battery pack supplies power when you turn on the computer.<br />
If you suspect a power problem, see the appropriate one of the following power<br />
supply checkouts:<br />
v “Checking the AC adapter”<br />
v “Checking operational charging” on page 53<br />
v “Checking the battery pack” on page 53<br />
v “Checking the backup battery” on page 54<br />
Checking the AC adapter<br />
You are here because the computer fails only when the AC adapter is used.<br />
v If the power problem occurs only when the docking station or the port replicator<br />
is used, replace the docking station or the port replicator.<br />
v If the power-on indicator does not turn on, check the power cord of the AC<br />
adapter for correct continuity <strong>and</strong> installation.<br />
v If the computer does not charge during operation, go to “Checking operational<br />
charging” on page 53<br />
To check the AC adapter, do the following:<br />
1. Unplug the AC adapter cable from the computer.<br />
2. Measure the output voltage at the plug of the AC adapter cable. See the<br />
following figure:<br />
3<br />
2<br />
1<br />
(20V)<br />
Pin Voltage (V dc)<br />
1 +20<br />
2 0<br />
3 Ground<br />
Note: Output voltage of pin no.2 of the AC adapter may different from the one<br />
you are servicing.<br />
3. If the voltage is not correct, replace the AC adapter.<br />
4. If the voltage is acceptable, do the following:<br />
v Replace the system board.<br />
v If the problem persists, go to “FRU tests” on page 50.<br />
Note: Noise from the AC adapter does not always indicate a defect.<br />
52 ThinkPad <strong>T500</strong> <strong>and</strong> <strong>W500</strong> <strong>Hardware</strong> <strong>Maintenance</strong> <strong>Manual</strong>