Could be a failing onboard graphics issue, display issue (flex connection / controller / inverter )
Try the following
- gradually open / close the screen of your laptop and see if you can replicate the fault by doing so. This could mean it could be an internal flex cable issue - torn / loose etc.
- as mentioned by a forumer here as well, if you have access to an external monitor, and see if there are tints or lines mentioned. That would point to us that is a a graphics issue. Else, duplicate your screen and have a look, if one has lines and the external is clear, it is a screen assembly issue.
- Check if there are error messages thy pop up often - if you see constant message pop ups such as Intel / Nvidia display adapter has stopped working it is indicative that it could be a graphics issue.
Solution:
For graphics card issues - you can try reinstalling Drivers to see if it could work (on the chance that it might fix corrupted graphics Drivers). Could be a perm fix or a temp fix.
For hardware issues, unfortunately you would have to make a warranty claim / repair it yourself