No flicker or fade since my last update 4 days ago. To my understanding from what I've researched, the CPU connectors are becoming loose, which is why this method works for 99% of the people who try it. Putting pressure on the CPU allows it to touch the connectors. If the problem returns, try opening the back up again and insert a bigger size square card this time. I find for some reason that opening up the back and repositioning the card helps.
I had a minor screen flicker this morning. I opened up the back again and just repositioned the card behind the CPU. I closed it back up and haven't came across the flicker for the rest of the day. Will keep everyone updated.
I started testing this method on 11/23/2016. 13 days in so far with not one flicker or fading issue. Battery life has greatly improved as well as device overheating.
I've watched other Youtube videos on how to fix the common flickering and screen fade to black issue for the LG G3. I've read that people have baked their motherboards or put a piece of paper on top of the camera cables.
I've tried the paper trick but the problem still persists and there's no way in heck that I was going to bake my motherboard.
I felt the issue was with the CPU and not the camera. I cut up an old credit card and placed it behind the CPU. So far, I'm going on a week with absolutely NO SCREEN FLICKERING OR FADE TO BLACK. And surprisingly, my battery life and phone overheating has greatly improved as well... I didn't expect that!
If this works for you, let me know by leaving a comment or hit that "like" button. So far I'm going on a week with no issue. I will keep you all posted regularly.
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Video recorded on a Canon G7x.
Video edited with Windows Movie Maker.