Chosen Solution
My phone did not dropped or wet.no reason to be damaged.
Hi, Try a factory restore to prove whether the problem is software or hardware related. Before you perform the factory restore, backup the phone using the phone’s backup feature. Ensure that the battery is fully charged before you restore the phone. Factory restore (also known as a hard reset) the phone using the phone’s factory restore feature. Be aware that a factory restore will erase all your data and downloaded apps. It will be like when you first got it. That is why it is important to do a backup first . Once the phone has been reset test the camera to see if it works OK or not. If it does then restore the phone with the backup that you made earlier, using the phone’s restore feature. If the camera still works OK then the reset has fixed the problem. If the camera doesn’t work OK again then perhaps a downloaded app is the cause of the problem. the trick is to find out which one. If it doesn’t then it may be that the camera itself has failed or perhaps it has a loose connection. Electronic components do sometimes fail, fortunately not often but they do. By main camera do you mean the rear facing camera? Here is a link to the ifixit Samsung Galaxy Note 4 Rear Facing Camera Replacement guide. This should allow you to at least check the connection and if it is OK replace the camera. Here is a link to the front facing camera replacement guide, if this is the camera that you meant. The replacement parts are available online.
Download the openCamera app from the google play store. If you still see the lines, then, yes you have a defective camera. Bad cameras were common in GS5 and GN4 phones. If you follow @jayeff instructions and decide to open the phone, I am giving you a very strong warning. The LCD is stuck to most of the critical components, BE VERY GENTLE when prying the glued LCD off, as that component is expensive and easily damaged.
