"Is everything dark or completely black? Can you see a picture at all? Is the “darkness” uniform across the entire screen?
I would suspect that the back light is not working correctly. If the picture is there and uniformly dim, I would suspect that there is a problem with the power supply. The LEDs that provide the back light may not be fully energized. If that is the case, the power supply is faulty. If you can, post a picture of the boards inside the unit by taking off the back. That will help to confirm our suspicions.
"Wow. DON’T go opening your TV, on this person’s ‘whim’... GEEZ!
There’s a LOT more they could have asked and looked into, before asking you to go above & beyond.
Googling the model & issue would have revealed (if they had bothered) that this is a common complaint with the 2017 models-on, and software/feature related (unless you actually have a defect)
Also, he could have asked is it constant or re-occuring(?)
I also have the same frustration with the same model and why I came here.
This happens EVERY evening, around 9pm, (During the day it’s normal again)
Yes, I disabled power-saving and it only got a shade lighter.. so particularly infuriating.
Lastly, I’d ask have you tried other modes, such as launching a video game or app through PC/HDMI(?)
When I launch a game, it becomes bright again and normal.. But the desktop is dim, just like TV mode.
This is another BIG clue, it’s NOT a hardware issue..
Please drop the screwdriver & back away from the set!!
This person isn’t going to replace your set, if something goes wrong & I bet taking it apart won’t lead to anything.. (good that is)
"Lol I don’t think anybody is going to start taking their tv apart if they don’t feel confident enough to do so. Give the guy some credit…I doubt he’s a mindless moron who just follows the advice of a stranger just because it’s posted as a response on this site.
FYI I had the same problem as he did. Sporadic dim screen not affected by any settings changes, uniform to all inputs. I checked my voltage as the other user suggested and sure enough, wasn’t getting enough out it to the LEDs. Bought a new power supply board and problem fixed!"
