Chosen Solution
So I have the same problem as all of the other ones here. Blackscreen on the LED cinema display, but I do have audio and my Mac does recognizes the display. I disassembled it to see what went wrong. Does someone here see something wrong with these parts? I don’t see it. I know this will not be a 100% confirm of the problem but hey, maybe you see it! I also noticed the ‘smudge’ on the backside..
Your logic board does in fact have damage! I’ve marked the area here
The insulator helps in pinpointing the area. Using a little image magic we can see how the areas line up
This is heat damage and you really need to replace the part as trying to fix this board will be very iffy as I’m sure the laminations are damaged. Logic board 24" Alu LED Cinema Display Logic Board Apple P/N 661-4823
