Roon

Hey guys, Iv'e got a problem with my screen and I don't know how to fix it (It's won't turn on, even the LED). So i opened my screen and start to disconnect every cable I can see XD When I disconnected the cable in the picture the little LED has started to work. Now I don't have any idea what causing this issue, If someone can help me I would be thankful. P.S. if someone know how this cable is called it would be really helpful