Question No signal

Oct 18, 2020
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I have a Sony UBP X800 4K DVD player, a LG SJ8 Sound bar and a LG OLED TV 55C8. I connect the DVD player to HDMI In on the Sound bar and HDMI Out on Sound bar to HDMI ARC (2) on the TV. I get no signal, though the advice on here is to connect them all this way using HDMI cables for the best sound. Any suggestions please?
 
Good Morning, just have the DVD into the TV and the soundbar into the TV. This will work just as well. HDMI IN is not 4K passthrough. Kind regards LG