We can further isolate the issue by connecting an external monitor to the notebook. If the display is fine with the external monitor, this clearly indicates that the issue is related to the LCD screen. Otherwise, it is due to the some other internal hardware.
You may follow these steps to connect the notebook to an external monitor.
1. Turn Off Computer.
2. Connect the monitor cable from the monitor to the monitor port on
the rear of the computer.
3. Connect the monitor to a power source and turn it on.
4. Press the Power button to turn on the computer.
* Switching the display to the external monitor
Press FN + F4 to toggle the display between the Notebook display and External monitor.
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