I am attempting to repair a black 32 gb iPhone 4 gsm. Whenever you launch the camera the graphical shutter never opens and the slider for video/still kinda flickers. I have tried doing a power cycle, then tried resetting via home and power, tried doingma full restore and setting up as new iphone, then physically replaced the camera module, now I am stumped. The phone will not take pictures. Could it be a busted logic board? Thoughts?