Powershot G11 LCD Screen Issue

My Dad has a Canon Powershot G11 where the LCD screen would shut off sometimes when the screen was moved. We suspected a damaged LCD hinge flex cable so bought a replacement off ebay, however when he fitted it the screen did not display at all and the lense would not open and close fully when turned on. When I had a look I noticed that he had inserted the flex cable in to the LCD driver board the wrong way around. When I turned it around the camera seems to operate correctly but the LCD screen was still blank (the backlight did turn on). We tried going back to the original flex cable but that made no difference. I suspect that powering on the camera with the flex cable plugged in the wrong way around may have damaged the LCD driver board, does this sound right to you and if so is it likely to have damaged the LCD screen as well?