You should have a LED-backlit TFT active-matrix "glossy" display ''(not an LCD)'' - which means the controller chip or connector on the logic board is bad. ''' Try an SMC reset.'''
I would talk with your vendor about why the displays backlight is not working.... examine the cable and connector for burn marks/poor connection.
If you have not '''connected to an external display''' do so. If you see no image there you have a bad VGU/VGC or logic board issue. Of course a good image points back to an internal display link problem which is controller chip, connector, cable or LCD screen.
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