I'm in a similar situation , ami is this happening :
I have an iPhone 4 from my sister that I have changed the screen and even there, all right, but what is my surprise that after changing the display , the camera does not focus far ; bone , if you make a picture of something close , goes well, but if you do by far is blurry , not focused or touching the screen. I removed everything again , I reassembled and nothing, always the same result.
I thought , "is the camera " pedi a new camera and do not put it directly opens the lens, with the lens screen freezes , restarting a few seconds . I thought I put the camera could be wrong and change it, same result. Remove other iPhone 4 camera working perfectly and put it on this , same result , the target does not open . I got crazy . Any idea what can be ? If you have to spend the dough, the spend, but I need to fix it !
I have also tried to restore , and other actualziar and nothing, I managed software anything.