No Image on Samsung 75" TV

I'm using the latest version of Libreelec on a Raspberry Pi 4 and I am trying to use it with a 75" Samsung TV. My issue is that if I use all the same hardware and cables and boot it up with Raspbian installed, all works fine and it displays correctly on the TV, but if I swap out the SD card and boot up with Libreelec, I just get the no source error on the TV. I know the SD card is fine because if I plug it into a monitor Librelec is running. Libreelec doesn't seem to like the Samsung TV. Is it something to do with default resolution and scan frequency and I need to modify the boot file?