Blank screen on monitor when tv is plugged into soundbar earc

[ginge353]

My set up
Lg ultrawide 49GR85DC-B
Samsung qn90f
Jbl Bar 1000 mk1
5080 + 14700k

Hi guys I’m trying to get this system set up so I can have it all plugged into and run atmos through the bar. I already have the pc set up to run like that it’s hooked up with hdmi from the gpu using a phantom monitor that way and it works well.
I only have one hdmi output from my gpu so I have to manually disconnect it from the soundbar and reconnect to the tv.
I already tested the atmos from the tv with atmos it worked well.
I don’t mind disconnecting things I had to do it with my previous soundbar.
The problem is when the tv is plugged into the soundbar with earc. If it’s plugged in like that and the tv is off the post screen comes up on the monitor which is plugged in with display port then the monitor goes to black screen.
I’m pretty good at stuff like this but this one I can’t work out. The only way is to have the tv unplugged from the soundbar if I want to use pc. It’s very frustrating.
Any help would be greatly appreciated

[MUC]

(04-06-2026 02:47 PM)ginge353 Wrote:  Any help would be greatly appreciated

Do I understand correctly? The desired connection setup is:

Nvidia GeForce RTX 5080 >>> DisplayPort >>> LG UltraGear 49-inch 240Hz Curved Gaming Monitor
The same Nvidia GeForce RTX 5080 >>> HDMI >>> JBL BAR 1000 MK1 Soundbar >>> HDMI OUT >>> Samsung QN90F TV (HDMI #3 eARC)

Issue: The monitor only displays an image when the TV is unplugged from the soundbar.

Is this correct?
What settings have you configured in Windows display settings and the Nvidia Control Panel?