Hi!
You can try to reinstall the driver of your Video Card. Navigate to the manufacturer's website, go to Support or Driver Downloads and enter the exact model of your laptop then download the latest driver. Reinstall the driver and reboot the computer. Check if that works. If that didn't help, it is the LCD's hardware failure. Checking the LCD's internal connectors require the help of a certified hardware or laptop technician. You can also try to ask suggestions from the manufacturer support group.
Best Regards
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