Well, my display ended up looking like this after the repair:
As you can see, there was a light/dark banded pattern along the bottom of the screen, corresponding to the LCD's backlight. In my case it was also accompanied by a constant high pitched whistling noise. I swear to anything that's holy, it was not coming from the fan or the speaker, but rather the motherboard itself.
Anyway, both these problems went away when I disconnected and reconnected the connector at this stage. I'm saying this on the off chance it helps someone else.
Однажды Они, Вы смогут просмотреть график вашего рейтинга, накопленного за всё время.
Репутация еще не заработана.