Changing the mode with the * button on remote from "vivid" to "movie" mode worked for me.
Go to settings, and restart the TV from there. Worked for me twice!
Press * on your remote
Scroll down to PICTURE SETTINGS, then press ok to open
Press right arrow to place tv on Movie mode.
Your color should restored to normal. There are also finer adjustments you can make a that time if u so choose.
picture directions below.
IMG_1026.PNG
IMG_1027.PNG
Hope this helps!!
This has been happening intermittently for me over the past two months. Sometimes I will be in the middle of watching something on DVD, sometimes I'll be in an application channel, or sometimes I will navigate home and not take immediate action for more than 5 minutes.
The experience is that the screen dims almost to black (not quite) but is so dark that I cannot see to navigate to system info or to see any help screens. Often when I try to power down, the system does NOT actually power down completely (based the red light indicator at the bottom of the set). I have left it this way for 30 minutes before powering back up, and still see the super dim screen.
Sometimes if I leave it for several hours and come back, it will power up with full visibility on the screen. Other times I have had to manually disconnect the power cord, leave it for 30 minutes, and plug it back in.
Originally I thought this might have been due to the system looking for system updates or applying them, but when this happened LAST NIGHT (while using hdmi cable connected through blueray port to stream a movie from my laptop -- screen when dark 3 times while still playing audio -- SUPER annoying), when I finally got to the system info screen to look at the last system scan, it had been 12 hours earlier.
System details: ROKU TV 5121X; TCL MODEL 40FS3750; Software version 9.4.0 build 4200-08; Last Updated Dec 12 10:35 pm
followup -- I have reported this issue to support.tcl.com/us
Did you ever get this problem resolved? I am having the same or similar problem regarding dim/dark screen. I have also submitted a support ticket. Have tried many factory resets, etc. Nothing works.
Yeah, I ended up getting a new TV
Ours has been getting darker for months. This morning, it's completely dark. Tried unplugging for 5min, as seemed to fix for some folks - didn't work for us. Can't even attempt to change settings because nothing is visible on the screen (we did try earlier when it started getting darker, but it didn't help).
