Galaxy Note 4 not working camera hardware issue after LCD replacement

Hello,

I have replaced the broken screen in my Note 4, after that I installed latest update, did factory reset clear cache, but when i launch camera app, it says camera failed.

I have tried using camera from working note 4 and still the same thing.

I want to do soldering work as mentioned in this video https://www.youtube.com/watch?v=Bfr7N8Zz..., but I'm afraid I could destroy the motherboard,

any help?