I purchased a G3 off trademe last week and it arrived on saturday. Description said bought overseas, no warranty but in good condition and it was, practically mint condition. Tested it when i first got it and the camera worked then went about installing all my apps etc. Later in the day came a photo opp so went to take a pic and got a black screen, restarted thinking that it was typical android camera issue with some other app having the camera locked. However on reboot i had the same issue, tried various things thinking i had borked it with some app install, different camera app, factory reset, new rom, LG flashtool .kdz flash, nothing worked i have the same issue. Figured at this point it can't be software related, took back off phone when i noticed that 4 out of 8 or 9 screws are missing! Crap.
Took apart phone and camera was attached to the motherboard fine, reattached anyway and restarted phone - still no go.

The front camera works fine, using xcam or snapchat, its just the rear shutter that doesn't work.

What else can be done? will ordering a new camera module likely fix the issue? They are cheap as chips (how a 13mp sensor as good as the G3 can cost $9usd is beyond me).

Oh and the seller isn't replying at this point, good stuff.