I have a Macbook Pro mid-2014 running macOS Catalina 10.15.3
A few years ago, I dropped it, and broke the screen, then bought a replacement screen and repaired it myself. Until today, I had no problems with it (except for a minor bug, which I asked about in this question).
Today when I turned my mac on, the internal display does not turn on, but the two external monitors I use work fine. The internal display is not shown in the display settings, nor in system information -> hardware.
What I've tried:
- NVRAM reset
- disconnecting the battery from the motherboard, and all cables that are connected to the internal display, then reconnecting
- a full reinstall of the OS
I've also tried a plethora of other suggestions, but I don't think they are relevant.
After a bit of research, I suspect the "logic board" might be damaged, but I don't want to spend the money for replacement parts without being certain.
What can I do to diagnose this problem? Is there anything else I can try?