I had the Lens Cap problem on my camera for about 2 years and after fiddling with it just recently some how have it fully functional again. I set the camera to Manual, Menu, System, Cam Reset, Execute. I think I did this a few times and turned my camera on and of a few times and now my screen showed white blurred streaks when I pointed it at light sources. So then I pointed the camera not directly at the sun but near it so see what would happen tot eh white streaks. They covered the screen for a second, the screen went blank and then everything worked just as before. I doubt this will work for everyone but it worked for me.
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