No hdmi signal

    Hello,

    I'm trying to replace my old (still working) AMD motherboard with a new one with a J5040 cpu (and an IT66317FN retimer) onboard but I'm not able to make it communicate with my old Samsung 4K IPS TV. So far I've been able to the get a hdmi signal only using a low-res vga-hdmi adapter. With LE10, using xrandr, I've been also able to see a fhd screen in the upper left corner of my TV screen set in 4K resolution. I upgraded LE to version 11 but the situation didn't improve.

    I'm aware it should be an hardware issue, but I wonder if someone could be so kind to suggest what to try in order to solve the problem.

    Thank you very much indeed!!!

    Two suggestions somehow related to the hdmi bandwidth drove me to set a 30Hz refresh rate in syslinux.cfg and disable the "HDMI UHD Color". Finally it works!