Screen fault // logical board - working when closed

Hi

Firstly thanks for taking the time to read this. My A1502 13” was working fine, until I shut the lid followed by a unfortunate drop, no more than 5/6 inches onto a rug. I thought nothing of it due to the lack of height and visually didn’t seem too destructive.

I was then greeted by a black screen upon reopening a few hours later.

Now, in terms of troubleshooting, I have done all the required resets, as well as opening the back up, taking everything out and rebuilding. I did not remove the trackpad or batteries.

I can get the laptop to work with no issues when using and external monitor via HDMI. I I also have to have an external keyboard/mouse connected and have the lid closed (I have to quickly shut the lid upon powering on). If I try to open the lid once logged in it will cease to work correctly, and freezes. Another observation, on initial power I have no keyboard backlight, but do have a green-light on the caps lock.

Now my question is to what the issue is and what component/s may I need to replace to get this rectified.

Thanks,

Ollie

Edited for grammar!