Dell Latitude 5420 Troubleshooting

The charging indicator light is not illuminating when the device is plugged in. If the device is on, the battery tray icon on the bottom right of the desktop indicates the battery is not charging.

Ensure the power adapter is plugged in and the charge light is on. If the light is not on, and the adapter is plugged in, the adapter is faulty. Consider purchasing a replacement adapter.

If the adapter is plugged in, and the light on the adapter is on, make sure the adapter is connected to the laptop. If the laptop only powers up when the adapter is plugged in, regardless of charging time, then the battery is faulty. Replace the battery using the Battery Replacement Guide.

The device does not respond when the power button is pressed.

Service Mode is a Dell feature that cuts power to the system for service. Plug the charging cable into the device and press and hold the power button for at least 3 seconds. If the device was in service mode, it will exit service mode and power on.

You need a functioning power button to turn on your device. If the device shows that it is charging but will not power on, there may be a problem with the power button.

The power button alone, or the entire keyboard may have failed. First, check to make sure that there are no crumbs or obstructions preventing you from fully pressing the power button.

The Device Can't Detect or Connect to any WiFi Networks.

If the device does not detect any WiFi networks, there may be an error with the WiFi Card. Open the Windows start menu and search for "Device Manager". Open the Device Manager application. A list of all peripheral devices connected to the device should populate. Scroll down and find "Network Adapters".

If there is no WiFi network adapter listed, then the device does not recognize a connected WiFi adapter. Follow the guide Wifi Card Replacement to replace the WiFi Card.

If a WiFi card is on the list, then right-click it and choose view properties. On the General tab of the properties dialog, view the Device status. If the card is connected and working properly, the status will read "This device is working properly". If the device status states the device is not working properly, then follow the WiFi Card Replacement Guide.

Even if you have a healthy WiFi Card, it will not function if the antenna cables are not connected to the card. Follow the guide Wifi Card Replacement and stop to check that the black and white antenna cables are connected to the WiFi Card. The connectors need to be properly seated, check to ensure that the connectors are not loose.

The device displays an error message during boot that no boot device is found.

The SSD may not be fully connected to the device. Follow the SSD replacement guide and stop at step TBD "removing the SSD." Check that the Drive is fully seated and the 3 screws are in place to retain it. If the drive appears improperly seated, remove it and reinstall it correctly. If any of the 3 crews are missing that hold the drive in place, replace them.

If you checked that the SSD is properly seated and the device still does not detect a drive, the SSD may have failed. To replace the SSD, follow the SSD replacement guide.

The device is not detecting the built-in speakers and the device does not produce any sound.

The speaker cable is loose or disconnected. It needs to be removed to access components beneath the bottom bracket. It is possible that this cable was not fully reconnected during another repair. Check that the connector is properly inserted in the slot.

If you have checked that the speaker cable is connected, then it is possible that the speakers have failed. You should replace the speaker at this point.