This automatic setting helps make sure your screen is readable wherever you go. Under Brightness and color, look for the Change brightness automatically when lighting changes check box, and then select it to use this feature. To find out if your PC supports this, select Settings > System > Display. Some PCs can let Windows automatically adjust screen brightness based on the current lighting conditions. (If the slider isn't there, see the Notes section below.) Select action center on the right side of the taskbar, and then move the Brightness slider to adjust the brightness. For more info, see Adaptive brightness and contrast in Windows. Some Windows PCs can automatically adjust the screen brightness and contrast based on content that’s displayed on your built-in screen. You might also see another check box displayed: Help improve battery by optimizing the content shown and brightness. Even if you use it, you can still move the Brightness slider to fine-tune the brightness level for a built-in display. Select Brightness, look for the Change brightness automatically when lighting changes check box, and then select it to use this feature. To find out if your PC supports this, select Settings > System > Display. (If the slider isn't there, see the Notes section below.) At least now the TV works.Select the Network icon on the right side of the taskbar, and then move the Brightness slider to adjust the brightness. I had an HD antenna with a booster that used the USB port for power and I have a feeling that fried my board but who knows. If you tried all the other fixes suggested and none of them work, before you curb the TV, I would try replacing the main board. There are some videos online to walkthrough the process but it is pretty simple. So I bought a new main board for like $28, only took about 15 minutes to install it. I was able to connect to wifi in the reset menu while the button was held down so that board seemed to be working fine too. The screen looked fine during the red logo loop and also while the reset button was held down so in my opinion that board was fine, the power stayed on the entire time the reset button was pressed so it seemed to me the power board was fine. So a bad USB port along with a reset button that only responded when held down the entire time led me to believe this was an issue with the hardware, specifically the main board. But the TV would not recognize the thumbdrive so it seemed like the USB port was bad. I thought maybe it was a firmware issue and loaded an update on a USB thumbdrive and tried to use that during the reset process. I tried to keep the reset button pressed down the entire time while I went through the reset process but it would come to a point where the tv needed to reboot and it would then act like I let go of the button and go back to the red logo loop. As soon as I let the button go it would go back to the red logo loop. But I noticed that if I held the reset button down for about 40 seconds it would go to the reset menu. The reset button on the back wouldn't work either. Every trick to fix it I read online didn't work. Unplugging made no difference, 1 hr, overnight, still the same red logo loop. It would stay stuck on this loop until I pulled the plug. Then after 10 seconds or so it would turn back on by itself, spend 15 seconds stuck on the red logo screen and turn back off. Was working fine one minute then shut off a show to put my son to bed, after that the tv would turn on, show the red TCL logo screen then turn back off after about 15 seconds. My model 50S425 that is a bit over 1 year old, started doing the same thing.
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