MacBook Pro Screen goes black.

Ok so here’s the jist of it…

MacBook Pro 2015 A1534,

was running normal then one day the battery got low and it shut down. Charged her up and everything was running smoothly, then the screen went black ( no lit apple logo on the back either ).

i thought the laptop died again. So I charged it. Still nothing, but I noticed the keyboard lit up.

held the power the power button and forced shut it down. Hit the power button to start it up again. Heard the chime and still just a black screen.

Shut it down. Came back a day later and turned it on. Everything was normal. It started up but then 3-5 minutes later the screen went black.

Plugged the laptop into a HDMI. It showed up and was clearly on. Went to display presences and the external display was the only one listed.

reinstalled OS, via external monitor.

still the same outcome when turning the laptop on. If I turn it on a day later the screen will show for a few minutes then turn off. If I try to boot it up within any time of the screen going black it will start with a black screen.

has this happened to anyone? What can be done? I’ve tried the resets to clear the memory etc.