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Trying to resolve the apparent smudge inside my iMac’s display resulting from a recent Genius Bar repair I bought two of these $2.99 suction cups (item number 46900) from Harbor Freight† and used them to open the display per these instructions.
Opening the display is trivial, as gently lifting on the suction cup handles popped the glass face upward and allowed it to be lifted off. Unfortunately, the mark noticed last night is not a smudge on the panel or glass, but instead appears to be in the panel itself. I spent time cleaning the panel because it also had a number of hand and finger prints on it, blew out some dust, then closed it up. It now looks perfect, save for the mark in the upper left corner. (Note, cleaning a display before closing it up is non-trivial and simply not fun.
Since this wasn’t there before the repair job I can only presume that something done by the Apple tech damaged the display. I guess I’m going to have to take it back again and see what they’ll do.
I’m rather disappointed by this.
† These suction cups, Harbor Freight item number 46900, appear to be identical to iFixit item IF145-023-1. The color, description (lifts 15 pounds!), and even details of the molding are identical between the two.