What is this white line on the laptop display?

Have just bought a used laptop and noticed that has a white line on the screen, what is that?

The display seems to have gone.

Very clear display damage.

Could be a "pixel failure" of the column driver or a contact problem (ribbon cable) in the laptop.

Search for monitor test, pixel error test on the Internet. The programs can test red control blue green pixels and possibly there's a column defective / failed.

To connect to the LED TV via HDMI, then that should work.

You do not need to test that.

Rather?

You can see that it is broken.

Yes, but the knowledge of such a test tool can be used for later purchases at "Louisa902"
worthwhile.

Private purchase no guarantee and return. Yes that is annoying