![]() By luck, I disconnected the bottom strip’s 58V supply as a test and all other strips came on and, even at 50% duty cycle, it appeared to have a nearly uniform brightness. I then began looking at the signals from the backlight PWM controller and saw that the darkened top strips were actually being PWM’d while the bottom half was full on. I tested all the strips before reassembling only to find the problem remained. I disassembled the panel and replaced all defective LEDs, some of which fail open causing an entire strip to go out while others fail shorted allowing other LEDs in the strip to continue working. I have a Vizio D55-F2 with a darkened top half that appears exactly like the picture in the original posting. It was almost as if it was applying a darkening gradient over the entire picture to cause it to emit less light. That faint line was driving me crazy! I can’t understand why that was the cause. Seems like a bug and not a feature in this case. If your Samsung TV has an eco friendly setting to adjust brightness based on ambient light, try disabling that setting. I noticed that when I changed various brightness levels the line would move up and down depending on the brightness, with brighter settings pushing it higher but never eliminating. Being a bit of an extreme troubleshooter I dug into TV settings. None of them worked and I was starting to get concerned. I do have xfinity so I tried many of the solutions here. I would describe it looking almost like the screen had an indentation or fold more than anything else since the picture underneath seemed fine. I had a problem with a single, slim, and kind of blurred looking darker line 1/4 to 1/3 of the way down my screen. BEFORE panicking from all these doomsayers on the net. my SAMSUNG is working flawlessly once again. in case something got hosed during the last firmware update. I decided to UNPLUG the DVR and let it do a complete POWER ON RESET. SO BEFORE I did that, I tried one last PD step. or spend an hour or two at the Comcast store waiting for a replacement DVR. No I'm thinking Im going to have to spend an hour on the phone with a tech that knows less then I do. I powered off the HDR but the problem still remained. Now I'm highly suspecting the Xfinity DVR device. so I tried a different cable and the problem did NOT go away this time. Now I know its either the HDMI cable feeding the signal or the xFinity box itself. I immediately noticed that the issue appeared to go away. I turned on my APPLE TV and switched to that as the source. Then, would the issue move when using another HDMI source. the first thing I wanted to do was to see if the problem went away if I changed channels. is connected to an Xfinity HDR and through HDMI cables. My Curved Samsung UN55JU6700 among several other devices. or did actual PD to eliminate issues with cables or devices connected to the TV. what I didn't see or read is where someone actually had a repairman look at it. or try to dial in and update TV firmware remotely. Supposedly people spoke to techs on the phone, which in most cases are reading from a tech manual. absolutely no one recommended a simple Problem Determination (PD) procedure to quickly determine if the issue was in the TV or outside the TV. I find it interesting that in almost every single case I read over the last 24 hours. I searched the internet for this problem and found many forums with pretty much the same resolution.
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