How to Troubleshoot AC Adapter Issues on a Dell Laptop

The AC adapter cable and the power cable may get frayed or cut, and the wires may become exposed at either end of the cable. This may happen due to the way the cable is wrapped around the AC adapter, or if the cable is subject to undue stress. If the damage is severe enough to expose the wires, you must discontinue using the AC adapter. To check the AC adapter, cables, and the adapter port on the laptop for any damages:

1. Unplug the AC adapter from the wall outlet.
2. Unplug the AC adapter from the computer.
3. Check the AC adapter and cables (including the power cable) for any signs of physical damage or overheating.
4. Check if the pin inside the plug or adapter port is bent, broken, or damaged.

For more information, see the Dell knowledge base article Identify AC Adapter Damage on Dell Systems.

If you find damage, contact Dell Technical Support for repair options. If you do not find damage, go to the next step.

1. Unplug the AC adapter from the wall outlet.
2. Connect another device on the wall outlet to verify if the wall outlet is working correctly.
3. Connect the AC adapter to a known-good wall outlet.
4. Plug the AC adapter directly into the wall outlet. Bypass any power regulators like surge protectors, UPS (uninterruptible power supply), power splitters. This helps isolate issues with the power regulators.

If the AC adapter works correctly when you bypass the power regulator or the docking station, the issue is with that specific device.

If the AC adapter is still not able to turn on the laptop, go to the next step.

1. Unplug the AC adapter from the wall outlet.
2. Disconnect any devices that are connected to the laptop.
3. Remove the battery. See the User Manual of the laptop for instructions on how to remove the battery. If your Dell laptop has a nonremovable battery, skip this section.
4. Press and hold the power button for 30 seconds to drain residual power from the laptop.
5. Connect the battery.
6. Plug the AC adapter into the wall outlet and the laptop.
7. Turn on the computer.

After the residual power has been drained, if the laptop does not turn on with the AC adapter, go to the next step.

USB-C is a cross-platform standard connector for charging, connecting devices, and transferring data. Select Dell laptops use a USB-C port to provide power and charge the laptop. It is essential to ensure that the USB-C charger is connected to the correct USB-C port that supports charging, especially on a laptop that has more than one USB-C port.

1. Unplug the AC adapter from the wall outlet.
2. Unplug the AC adapter from the laptop.
3. Disconnect the power cable from the AC adapter.
4. Connect the power cable firmly to the AC adapter.
5. Verify if the LED on the AC adapter is on. If the LED is not turning on, try a compatible, known-good AC adapter.

After reseating the power cable and AC adapter cable, if the laptop is not able to turn on with the AC adapter, go to the next step.

Reset the AC adapter by following these steps:

1. Unplug the AC adapter from the wall outlet for 15 seconds.
2. Unplug the AC adapter from the laptop.
3. Plug the AC adapter into a known-good wall outlet.
4. Plug the AC adapter into the laptop.
5. Check the LED indicator on the AC adapter.

If the LED indicator on the AC adapter LED indicator turns on, go to the next step.

If the LED indicator on the AC adapter is off or turns off when it is connected to the laptop, contact Dell Technical Support to learn more about repair options that are available in your region.

Using an AC adapter that has a lower wattage may cause one or more of the following issues:

• The laptop may show an error message such as "The AC adapter type cannot be determined. This prevents optimal computer performance" or "Unknown or incorrect AC adapter detected."
• The laptop may reduce the processor (CPU) speed to save power.
• The laptop battery might not charge or charge slowly.
• The AC adapter might heat up.

Each Dell laptop uses an AC adapter that is of different wattage. This can depend on the hardware configuration of the laptop. Dell laptops come with a 45 W, 65 W, 90 W, 130 W, 180 W, or 240 W AC adapter. For optimal performance, Dell Technologies recommends using the original AC adapter that came with the Dell laptop. The AC adapter's wattage information is printed on a label on the bottom of the AC adapter.

To verify if the laptop is recognizing the AC adapter correctly:

1. Restart the computer.
2. When the Dell logo appears, tap the F2 key until the message Entering Setup appears.
3. Verify the AC adapter type in the BIOS options. The AC adapter information is most often found on the main screen of the BIOS.
   • If the AC adapter type is None - Verify that the AC adapter is connected to the laptop, the LED on the AC adapter is ON, and the correct AC adapter is connected to the laptop.
   • If the AC adapter type is Unknown - Try with another working AC adapter. If the issue persists or if the same AC adapter is working fine on another laptop, contact Dell Technical Support to learn more about repair options that are available in your region.
   • If the AC adapter type is recognized correctly, go to the next step.

Running a hardware diagnostic test can help identify what the issue is and provide you troubleshooting steps to help resolve the issue. Dell offers both integrated and online diagnostics. The Dell preboot computer assessment checks if the AC adapter is recognized by the system board correctly.

To run the Dell SupportAssist Preboot System Assessment or ePSA test:

1. Turn on the computer.
2. At the Dell logo screen, tap the F12 several times until the One Time Boot Menu appears.
3. Use the arrow keys to select Diagnostics and press the Enter key.
4. Follow the on-screen instructions to complete the diagnostic test.
5. If the diagnostic test reports an error, make a note of the error code and the validation code, and contact Dell Technical Support to learn more about repair options that are available in your region.
6. If the diagnostic test passes, it means that no hardware issues were found.

The BIOS (also called System Setup) is firmware that is embedded onto the system board (motherboard) of the computer. Updating the BIOS to the latest version helps the computer recognize the AC adapter correctly.

Learn more about Dell BIOS Updates.

If the AC adapter type is not recognized by the laptop, see the Dell knowledge base article Forcing a BIOS Update without the AC adapter that is attached on a Dell Laptop. Before trying to force the BIOS update, read the disclaimer below.