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HP Notebook PCs - Using and Testing the AC Power Adapter

This document pertains to HP and Compaq notebook computers.
The AC power adapter is used to recharge the battery in a notebook computer and to provide dependable power for operating the notebook for long periods of time. If an AC power adapter fails, it will not recharge the battery and it will not provide power to operate the notebook without a battery. Use this document for information on how to use and test your notebook AC power adapter.
Using the AC power adapter
With proper use and care, your AC power adapter will recharge the notebook battery and provide power for operating the notebook for extended periods. Read the section below for information on the proper use and care of your AC power adapter.
Testing the AC power adapter
If your notebook exhibits any of the following symptoms, then you should test your AC adapter using the steps below to verify the AC adapter is working properly.
  • When the notebook is connected to the AC adapter, the notebook does not turn on and lights or LEDs do not turn on.
  • When the notebook is connected to the AC adapter, the display does not turn on.
  • When the notebook is connected to the AC adapter, the power LED is off.
  • When the notebook is connected to the AC adapter, the battery does not charge.
 caution:
The AC adapter may shutdown and remain without output due to conditions that can trigger overcurrent, overtemperature, and short circuit. To recover the adapter output, unplug the adapter from the notebook for approximately 5 minutes and plug in again.
Step 1: Examine the adapter, power cord and computer for physical damage
  1. Unplug the power cord from the AC wall outlet.
  2. Disconnect the DC connecter from the computer.
  3. Check the AC Adapter label to ensure it is labeled with HP logo.
    Figure : Example of HP logo on AC adapter
    AC adapter with HP logo highlighted
  4. Check the AC adapter and cords for physical damage or signs of overheating.
    Figure : Example of damaged AC adapter
    Chipped and cracked AC adapter and damaged cord
    Figure : Example of damaged AC adapter
    Damaged AC adapter
    Figure : Examples of broken connectors
    Examples of broken connectors
    Figure : Examples of bent or missing ID pins
    Examples of bent or missing ID pins
  5. Check the DC connector pin on the computer to ensure the pin is not bent or broken.
    Make sure there are no obstructions or any foreign material inside the DC connector and that the center ID pin is straight and not slanting inside the DC connector.
    Figure : DC connector pin on computer
    DC connector pin on the computer
If the AC adapter, DC connector, or any cords are damaged, do not use the adapter. You can purchase a replacement AC adapter from HP. See Ordering HP Certified Replacement Parts for more information, or contact HP Customer Support for further assistance.
If there is no physical damage to the AC adapter, DC connector, or cords, continue to the next step.
Step 2: Verify the wall outlet is functioning
  1. Unplug your AC power cord from the wall outlet.
  2. Test the wall outlet by plugging in a small lamp or other device that you know is working.
    If the small lamp or other device works, the wall outlet is functioning. Continue to Step 3: Disconnect and reassemble the power cord and AC adapter.
    If the wall outlet is not providing power, test the lamp or other device on different wall outlets until you find a working wall outlet and continue to the next step.
Step 3: Disconnect and reassemble the power cord and AC adapter
  1. Remove the power cord from the AC adapter.
  2. Reconnect the power cord to the AC adapter. Be certain the power cord is fitted tightly into the AC adapter inlet.
Step 4: Connect the AC adapter to the PC
  1. Remove the primary (and secondary) battery from the notebook computer.
  2. Connect the DC connector end of the AC adapter into the computer power connector.
  3. Plug the AC adapter power cord directly into a functioning wall outlet. Do not plug into a power strip, surge protector or secondary power source.
  4. Verify the LED on the AC adapter is lit when plugged into an AC wall outlet.
     note:
    Some AC power adapters do not have an LED.
  5. Verify that all power cord connections are secure.
    If the DC connection to the notebook is loose, the connector or system board may be damaged and require repair. Contact HP Customer Support for further assistance.
Step 5: Verify the notebook receives power from the adapter
  1. With the AC adapter connected, look for the power LED light on the front, top or side of the notebook computer. If the power LED light is on, then the AC adapter is functioning properly. Proceed to the next step.
    If the power LED light is off, then the AC Adapter may be failing or the system board is damaged and requires repair. Contact HP Customer Support for further assistance.
  2. Perform an AC Adapter UEFI test by using the following steps.
    1. Make sure the power cord and adapter is connected to the system and wall outlet.
    2. Turn on the computer.
    3. When the HP logo or boot menu is displayed, press F2 before the notebook boots to Windows.
    4. Once in the UEFI menu, select component tests.
    5. Select the AC Adapter test.
      If the test result is PASS, there is nothing wrong with the AC adapter. Do not replace it.
      If the test result is FAIL, record the unique 24-digit failure ID code before replacing the AC adapter (failure ID code will not be displayed unless the adapter is plugged in).
       note:
      If the HP AC adapter is defective and the computer is under warranty, contact HP Customer Support (this is when the 24-digit failure code might be useful). If the computer is no longer under warranty, see Ordering HP Certified Replacement Parts.
Step 6: Look for the battery icon in the system tray
Windows displays a battery charging activity icon in the system tray. Refer to this icon from the Windows desktop next to the time and date.
  • With the AC adapter connected to the computer, the battery charging icon indicates the AC adapter is working properly and has enough power.
    Figure : Battery charging icon
    Battery charging icon
  • With the AC adapter connected to the computer, you might get a battery power icon instead.
    Figure : Battery power meter icon
    Battery power icon
    With the AC adapter connected to the computer, a battery power icon indicates one of the following conditions:
    • The AC adapter is not working properly.
      If the AC adapter is defective and the computer is under warranty, replace the AC adapter with the appropriate spare part. For further information, see Ordering HP Certified Replacement Parts.
    • The AC adapter does not have enough power to charge the battery and to run the notebook computer at the same time. Do not use adapters from other computers. Use the power adapter that came with the notebook computer for best performance. To order a replacement adapter, see Ordering HP Certified Replacement Parts.
If power or charging problems persist, it is possible the battery is failing or is in a deep discharge state. For more information, see the section Troubleshooting the notebook battery in the document Battery Does Not Power Notebook or Hold a Charge.

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