Find helpful information about your LG Product through our Help Library. Find helpful information about your LG Product through our Help Library.

Help Library

Find helpful information about your LG product

[LG Laptop] Cannot connect a dual monitor in Windows 10. (HDMI connection)

Troubleshooting

If there is an error in the graphics card, the screen goes blank when an external monitor is connected.

Causes and Symptoms

  • Video driver has an error.
  • There is a problem in the laptop connection port and cable(HDMI).

Try this

Did you try to [Restart] PC after removing the graphics driver in device manager?

➔ If there is an error in the graphics card, the screen goes blank when an external monitor is connected.

① Right click with the mouse button on the [Start] button at the left to the screen or press the [Windows + X] keys on the keyboard to run device manager.

Right-click on the Start button and enter Device Manager

② In [Device Manager], double click the [Display Adapter] item.

③ After selecting the graphics device below [Display Adapter] and click the [X] icon at the top.
※ If the graphics device is not installed, then the display adapter is marked as “default Microsoft display adapter” or "standard VGA graphics adapter".

④ Do not put a check mark on the [Attempt to remove the driver for this device.] item but click the [Delete] button.

Delete graphics driver from device manager

⑤ After you [Restart] the PC, check if the screen brightness is adjusted.

⑥ If the problem persists, check [Delete the driver software for this device] and restart the PC and then reinstall the graphics driver.


Wait! Find out more.

How to reinstall the graphics driver

① When purchasing an LG product for the first time, you should run the LG Update Center program if it includes Windows or run the LG DnA Center Plus program if it doesn't include Windows.
② If you are unable to locate the LG Update Center or the LG DnA Center Plus program, you can access the LG Electronics website's Customer Support → Drivers and select [Laptop/Tab] from the [IT/Monitor] category and enter the model name.
After that, choose the corresponding Windows version from the [Operating System (OS)] category. Once you have done this, you can proceed to install either the LG Update Center or the LG DnA Center Plus program.

After removing the HDMI cable, did you try to reconnect it or use another cable?

➔ If the cable has a contact problem or if the inner wire of the cable is cut off, the screen will not be displayed.

Did you check for alien substances such as dusts in the external monitor connection port(HDMI) of the laptop?

➔ After powering off the laptop, use a soft toothbrush soaked in a small amount of alcohol and clean the internal port with it.

HDMI port cleaning instructions

※ If the problem persists after the above remedies, then you need to have it checked by an LG Electronics service technician.

This guide was created for all models, so the images or content may be different from your product.

*Required question