Question Lenovo thinkpad t480 Lcd issue

[LenOvo890]

Hi!
I'm having issues with my Lenovo thinkpad t480. When I turn it on it makes 2 beeps followed by error sound (010288). Screen is black.

I tried following:

Connecting to the external monitor (laptop works)

Neither Lcd not cables\ribbons are damaged (I connected it to another thinkpad to check if they work. Same with ram.

Any ideas what might be the issue?

Thanks