I bought a Hisense 55QD5N for a second display Windows 10. I am running a display port to HDMI cable to my primary monitor LGCX9 55. When I connect HDMI cable to Hisense as second display Windows recognizes the display, but Hisense only displays black screen. I can drag an app off the screen to the Hisense but it doesn't display.
If I run HDMI to Hisense as primary display it works fine.
If I run HDMI to other LG tv as secondary display it works fine.
Did two factory resets and firmware update. Hisense confirmed it can run 3840 x 2160. Tried changing the resolution and refresh rate but no luck.
Called Hisense and supposedly someone is supposed to be coming out. I have a feeling there are not going to be able to resolve this issue.