I had the same problem. It was indeed the LCD's fault, but I found a cheaper fix: applying pressure to the control board at the bottom of the LCD fixed the problem. I made it permanent by adding a piece of thick paper between the control board and the aluminum casing. Hope this helps anyone who has the same issue in the future.
+
+
UPDATE: My cheap fix lasted for about two months and then the problem started happening again, worse and worse. It was probably a bad connection on the LCD itself. I dished out $150 for a new LCD and that fixed the issue for good. Not cheap, but definitely worth it compared to the $800 Apple would charge for the same problem.
I had the same problem. It was indeed the LCD's fault, but I found a cheaper fix: applying pressure to the control board at the bottom of the LCD fixed the problem. I made it permanent by adding a piece of thick paper between the control board and the aluminum casing. Hope this helps anyone who has the same issue in the future.