Could be a bad lcd controller board inside that is heating up on the element thus making a bad connection or your set you video mode beyond the scope of you lcd and thus its not displaying.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/edwy_1a56970cf1ea4620
If the screen turns off check display adapter
or driver is going bad
you might need a new power supply
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Hold down the FN key and the press the Fuction key up on the top of your keyboard that has the icon of a monitor and see if that does it. That should change the output to the lcd on your laptop instead of the external monitor.
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