Why is my TCL TV stuck on red screen?

I'm sorry you've had this experience. It wouldn't hurt to try clearing your cache:

Hit HOME 5 times.
UP once.
REWIND twice.
FAST FORWARD twice. (Clears cache & tv reboots itself. Be patient. It takes 1-2 minutes for the tv to go black, and come back on)

That seems to fix some problems factory reset doesn't. 

Another thing you could try is factory reset, but tell it you'll setup the network later (but don't). This loads a minimal and seemingly different software (the antenna tv is very different, like it used to be before Roku messed it up). So far, this doesn't seem to fix any of the common problems resulting from Roku's untested updates. Maybe it's not that different. But, it wouldn't hurt to try it. If your tv worked again this way, you could add a $22 Firestick Lite to HDMI to stream that way (Sofabaton F2 remote to control the tv and stick).

Your tv should be under warranty still. That should make more sense. But, having your Roku tv disconnected from the internet protects it from untested updates.

I have a TCL Roku TV I haven’t even had it for a year, tv worked perfectly fine last night we even rented a movie from roku channel. Went to watch it today & at first when I clicked on Netflix the remote made the nose to confirm I clicked it but it wouldn’t open. It did nothing for at least 2 minutes. Then it told me I wasn’t connected to the internet. I tried to test my connection the first time it kicked me out I tried again it connected to the wireless but wouldn’t connect to the actual internet a screen came up telling me to reset my internet or restart the tv. I know my internet was fine because my phone is connected to my WiFi so I chose to reset the tv. It started to reset then the screen went black the red start up screen then came on & it’s been stuck on that screen for about an hour. I had looked online & saw people mention holding down the reset button by the HDMI ports, I tried that & nothing turned off but came right back to the red screen. I had then saw people saying they needed to unplug any HDMI cords that were plugged into the tv then reset it so I unplugged both of my HDMI cords & held the reset button for 30 seconds & still nothing. It’s just on the red screen. Any idea of how to fix this?? Thank you in advanced! 

I have seen similar issues regarding this matter. Lime others I bought this tv almost 2 years ago. I've had no issues with it and only used it lightly. Now all it keeps doing is turning off and on by itself in a loop. It shows the red tcl 4k screen for about 4min then turns off. It repeats this all day if I let it. I have tried holding the power button for 30 sec and nothing. I've tried un plugging and plugging it in after 20min. I've tried the reset button on the side, holding it and pushing it. Both ways just tur ed the TV off and it could tinied the same issue. I have no option to even go to any sort of menu for settings to view my model# or serial#. Whatz wrong with your product. It tells me to never buy a TCL or Roku product again.   

I ran into the same problem, I had to change the tv picture mode to movie in order to see a normal picture. I tried it every mode only movie mode works. This seams like a software or firmware problem. I’ve had my tv since November but didn’t operate it or plugged it in until January.