Although in principle it should be possible, it requires you to implement a VGA or HDMI or DVI connection on that broken laptop or in a new case for the screen. That's not something you'll find instructions for anywhere on the web. But it might be a nice project for a student of electronic engineering.
Kees
I have an old laptop which motherboard is broken. So I tought, since the monitor/screen works, if I could use it as an external monitor for my current laptop.

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