It could be the cable that connects the display to the motherboard, or it could be the display itself. To know which you would need to open it up and check the cable for bends, pinched area, cracks, damage, etc. Also check if it is loose at either end. If the cable seems fine, then the display will likely need replacing.
NOTE: If under warranty, don't open it up yourself. Contact the manufacturer. Also, if you don't feel comfortable doing the work yourself, and it isn't under warranty, then try a local tech.
There should be one cable connecting the motherboard to the display. You just need to be able to carefully access that part of the laptop. Here are a couple of video walkthroughs on replacing screens on that model. Now they may not be your exact one. So many variables out there, however they should help get you through it. https/www.youtube.com/watch?v=6qb4gtC2UMs and https/www.youtube.com/watch?v=ksf4g0XGyiM