I hope its ok to use this thread since the title describes my situation.
I grabbed the nightly for the Pi4 (http://nightly.builds.lakka.tv/Lakka-LE9.2/latest/RPi4.arm/) and I burned the image and when I turn on the Pi the TV detects a connection but the screen just goes black and does not change. In case something went wrong I burned the image again on a different card but got the same result. I know this is based on LE9.2 so I downloaded that and it worked fine and booted into Kodi
I have burned plenty of images before for the Pi2 and Amlogic devices so I dont think the issue is with imaging the SD card.