As far as a way of checking & knowing if it's broken u can try *#*#7378423#*#* to enter service menu from phone dialer. At least that's the service menu number for r800i, I think Verizon's r800x was different number. You can check almost all parts of the phone But I don't remember if front & rear camera had an option.
Sent from my ICS KA twizz-elve
Devices: AT&T Samsung Galaxy S4(Root)4.4 SS-Chaos 2.3.0
Minix Neo X7 4.2.2(Root)-Android TV Box
AT&T Sony Xperia Play(Root)4.1 Super JB
You know you wanna Root it, Cmonnn.