I just made new video showing the process of iPhone 6 Plus backlight repair. This iPhone was shipped from one of south Florida shops. Initially it came with no backlight at all. After checking the voltages on the connector I determined that potentially one of backligh boosters is out. Still, I was slightly confused why the I’m not getting half backlight since one line was showing 20v. I’ve replaced the booster and still had no backlight. At the end I had to replace both filters as well. iPhone was fully functioning. Check out the video of that particular repair:
If you have issues with your backlight print the shipping form and ship the phone for fast backlight repair.