Emission materials don't show any light I'm using an emission texture to use as a light, but it doesn't show anything. What could be wrong?
When a put Render mode (cycles) doesn't work eiter.
Light should be seen behind the TV. Thank you in advance
If you are asking for backlight - ambient light behing a TV lightning a wall ...

add Area light between TV and wall that works for Eevee and Cycles

Cycles

Eevee

Using emission material require Light Probe - Irradiance Volume for eevee engine that seems to be too short distance between emiter and receiver, so probably harder to setup.