Hello All, I did as "LikeARabbit " suggested above, and it worked for me. I was having an issue of a very dim to complete shutdown of my Apple LED Cinema Display 27". I opened the cinema display as per the instruction from the "Apple Thunderbolt Display Teardown". The inside are almost the same as I have both and can attest to this. I tested the power on the logic board that "LikeARabbit" suggested and mine was running a consistent 24.3 V on my digital multimeter. As to where to test this, please see attached photos. sorry for the bad quality photos, but I had very little time. Since my power was within in range I made sure all the cable were seated properly by unplugging and replugging them one at a time. Do this with the power cord unplugged so you do not fry the boards, LCD, or yourself. One plug I noticed right away was the "Function" plug which was very loose. I believe this is the LCD background lighting system as it istantly increased my brightness after reseating this cable. After powering the LCD...