I defer to the service manual and it's trouble shooting flowchart. Nothing in your post reveals which part is broken but it is broken. What is it? You won't know till you swap this and that part.
I have LG LS50 laptop, and it droped on the floor yesterday. After that, screen won't turn on. I have disassembled it, but couldn't find any problems in screen conections, or cracks on it. All other than that, seem to work correctly, it starts as usual and seems to be loading.
Would be very thankfull guys if you could help me there.