Original post by: Fereidoon Abdolmaleki ,
I had the same problem. My problem onset first time when I used a Samsung charger. On that duration my battery was a little weak- about 80% efficiency. So l changed my battery and my LCD then my iPhone fixed. Also i have checked my new LCD and my new battery separately and really the problem was from my LCD. In addition I wanna say that my new LCD is not original. It’s a Chinese LCD with normal backlight. I hope you can solve your problem too.