Sometimes a loose or faulty power connection can cause display issues. Restart your TV: Press the power button on your TCL Roku TV or use the remote control to turn it off, wait for a few seconds, and then turn it back on. Restarting can help resolve temporary glitches that may be causing the black screen.
Unfortunately….the TV Screen is bad. The LEDs are at fault.. It is nearly impossible to remove screen cover to replace the LEDs in any TV. When under warranty…we will receive a new panel (screen, once called the picture tube) and replace. Take boards out of bad TV and install into new panel. A new panel is as much as the TV $. d5lKhf.