Apple tv 4k not accepting my 8k hdmi lead as being good enough for dolby vision on my sony kd55ag8 tv

Hi

Yes my apple tv works perfectly well with all HDMI leads. When setting up for use with my new Sony KD55AG8 I noticed that the Apple TV needed to test the HDMI lead in order for it to switch to DOLBY VISION the test failed and it reverted back to standard connection. The HDMI lead that I was using was a high speed lead so surprised it failed. My new HDMI lead is an 8K 60 which is capable of 120 at 4K so should be more than capable of passing the Apple TV 4K test.

According to the spec for my Sony OLED tv all HDMI inputs are 2.1

I did wonder if the ports had to be configured but could not find anywhere in settings or on Sony support site that this is possible on this TV

Thanks Urquhart1244 - it turns out you were right, I went through the TV settings again and found that HDMI 1 & 2 had to be switched to receive Dolby Vision or HDR. Many thank, its not always easy wondering around settings to find what you are looking for.

Apple Tv has now switched on Dolby Vision but to be honest I am not very impressed. It has now subdued the colours and doesn't appear to be as sharp so have switched back to standard settings and everything now looks better. I think I will live without Dolby Vision and HDR which does a similar thing to the picture.

Thank to everyone for replies to my question but problem now resolved

Thanks again - ending post