This symptom is usually due to the wrong driver for the LCD used in the ROM, but if you haven't installed anything (specially didn't try to flash a ROM) than a hardware issue is more likely. You can try to use the HDMI out to see if the tablet is working normally and it's "only" a screen problem.
If it is a hardware problem and if using it with HMDI isn't enough for you and you backed up your stuff, you can try
restoring the original firmware. It's automatic, you don't need to type anything, just wait until the tablet auto-shutoff to make sure the process ended and try turning it on again. Good luck.
If you need further help, I’m available over the phone at
https://www.6ya.com/expert/michael_e0539de310ea5ad7
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