I had an ipod touch 4th gen - did an lcd replacement and rear cam didnt work. Same issue, just froze up when cam app opened. Took apart ipod again and when i got to the rear cam i saw that it was not completely connected. Snapped a new one in place with the power OFF. Put back together and all was well. I dont know if the old cam would have worked and dont really care - its fixed. Hope this helps someone. Joe