Right so we now know that the HDMI format settings on your TV are slightly different to mine.
Is your Blu Ray player connected directly to the TV if not can you connect it to the HDMI 4 port on the TV.
We know your Blu Ray player is capable of playing HDR content including Dolby Vision.
And we know that the TV can display Dolby Vision.
Can you confirm that the Blu Ray disc you are watching is a Dolby Vision disc.
Is the HDMI cable you are using a high speed HDMI cable (18GBs/sec) or better an Ultra High Speed cable
(48GBs/sec). Certified is best.
With a Dolby Vision disc in the Panasonic and the player set to output in Dolby Vision and connected to the
TV via a high speed or Ultra High Speed HDMI cable start playing the disc.
The TV should automatically pick up that the video signal is Dolby Vision, check with Settings (remote)> Picture Mode it should display the options Vivid, Dolby Vision Bright and Dolby Vision Dark.
If you don’t get those options in Picture Mode then press Settings (remote)> Picture Settings and scroll down to Video Signal.
What are the three options (HDR mode, HDMI video range, Colour Space) set to, ideally they should all be set to Auto.
If they are set to Auto does that make a difference. If you click right on HDR mode what options do you get.
If you are still not seeing the Dolby Vision options in Picture Mode then go back to HDMI signal format setting and experiment with the options under HDMI 4, Standard, Enhanced and Enhanced (4K 120) and see if that gets you the Dolby Vision option in Picture Mode.
You can also try those options with the VRR button switched on just to see if that makes a difference.
If you are absolutely certain that the disc you are playing is a Dolby Vision disc and the Panasonic settings are set to output Dolby Vision and you are using at least a high speed HDMI cable and the TV is set up as I have described and your still not getting DV then thats a head scratcher.
As another experiment download this Dolby Vision file to your computer then transfer it to a USB stick and play it on the TV using the TVs built in media player. (USB should be in any of these formats FAT16, FAT 32, exFAT or NTFS)
After inserting the USB wait a few seconds and you will a confirmation screen a USB has been detected with four options select View Content with Media Player.
Make sure the USB device is selected/ highlighted on the left side then click right and scroll up/ down, left or right to find the file and then select to play.
Download file here,
https://www.demolandia.net/downloads.html?id=86575423
When playing the file press Settings on the remote and then click on Picture Mode on screen, you should see the Dolby Vision options.
When the video starts playing you will have a pop up display on screen (lasts for 5 seconds) scroll right to the three dots, click.
From the pop up submenu select Details. On the right side you will see details of the video file, scroll to the bottom of the list and
under HDR it should say Dolby Vision and under Colour Space it should say BT.2020.
Are you seeing that.
