Around 4 days back, my MacBook Pro (a1502) dropped from a chair (2-feet high). Since then, it has been working properly, no issues. Yesterday, I was working on it and suddenly the display went blank / black.

1. The computer is still working (startup chime, keyboard lights up etc.)
2. Connected the laptop to an external monitor - the computer is full usable with an external monitor
3. Tried some of the tests people have suggested: Held the apple logo against bright light - the display is Black (I don’t see any light).
4. I did try Cmd R, PRAM and NVRAM setups - no luck
5. I opened the back cover, and there is a cable that can be disconnected. I followed this How to Fix Dropped Macbook Pro Black Screen - no luck

Is there anything else I can try to make sure that it is not some loose connection.