I recently replaced the CCD sensor on my old S1 IS and now it works great. I was getting the black picture problem. Overall, replacing the CCD was a medium difficulty repair, with the hardest part removing the glue that was placed around the screws holding in the CCD and finding the correct bit (T4) to remove those screws. Overall, it took me about 1-2 hours to repair. I found the replacement CCD chip on ebay for $10.