Question Vaio laptop screen flickering

Apr 23, 2023
I need help with my old Sony Vaio Flip 15.
The display is semi dead and I have to use external screen, but would like to find the cause and fix it, since it is a touchscreen and I love it.
The screen would start to flicker and then go white and then completely dark. How do I find the root problem. If it is display cable, graphics card or driver? I am willing to install new cables or components, but don't want to buy and replace things if that won't fix the problem.
I am also a bit limited since I can't do anything if the laptop does not recognize external display.
Please help.