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.
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.
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.
How to reinstall the graphics driver
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.
※ 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.
