Unplug the TV immediately
Do not press on the screen
Check for visible cracks, lines, or black spots
Inspect the power cord and connections
Try a different power outlet
Test with a different HDMI or input source
Reset the TV if it still powers on
Replace the screen panel if the LCD or OLED panel is cracked
Replace the backlight if the screen is dark but the TV has sound
Replace the T-Con board if there are lines, flickering, or distorted images
Replace the main board if the TV has no picture but powers on
Contact the manufacturer for warranty service
Take the TV to a professional repair technician
Replace the TV if repair costs are too high