[qp6019352]

First you say:

Originally Posted by saintfrenz

The TV does not have any options for changing RGB range anywhere as far as I could see.

Then you say:

Originally Posted by saintfrenz

After setting the HDMI Black Level to "Normal" (as opposed to "Low" before)

So, there is a option in the TV to change the RGB range .

Originally Posted by saintfrenz

PC" mode is the only one in which you get no chroma subsampling i.e. 4:4:4 chroma. Detailed review/settings on this TV is here

https://www.rtings.com/tv/reviews/samsung/mu6300

Yup. And PC mode will always expect RGB Full Range (0-255), the "HDMI Black Level" setting is not even available in PC Mode AFAIK.

Originally Posted by saintfrenz

P.S. from @qp6019352 description, it looked like color crush and not washed out.

Crushed/clipped black levels and colors would mean that the DisplayLink adapter is sending out RGB Full Range (0-255) and your TV is set up to expect RGB Limited Range (16-235) input. So, if you set your TV to expect RGB Full Range (0-255) input, the issue should be gone.