If the TV stays with the Led in standby, this fault is repaired with this firmware!
1- Unzip the attached file.

2- Copy the file SISEU23X8M.bin to the root of a Pen Drive.

3- Unplug the TV and insert the pen into the USB port of the TV

4- Connect the tv to the power, you will see that soon after the LED starts to flash slowly
and that after a few minutes it blinks quickly,
then disconnect the TV from the power and remove the USB pen.

5- Turn on the TV and tune again.