KD48A9 Dolby Vision /HDMI 2.1?

[Josh009]

Hi there,

Two questions, number one. How do i access Dolby Vision? It says from retailers this tv has it but i can't locate it anywhere. There's no option in the picture mode settings and no option under video signal HDMI settings. All i get  is HDR10 and HLG, no option for Dolby Vision. Unless you have to be on a certain programme for it to pop up, i can't find it. 

Second question. Sonys own specs for this TV list "feature earc for HDMI2.1" does this mean its third HDMI port is infact a 2.1 or am i being mislead?

[Peter_S.]

Hi Josh,

I have to apologize - I mixed up the specifications of the models..

A9 does support eARC only from HDMI 2.1 specs but nothing else.

Please also check below information:

		HDMI 2.1 features
Type	Model	eARC	4K120	VRR	ALLM
8K LCD	ZH8	YES	YES*	NO	NO
	ZG9	YES	YES*	NO	NO
4K OLED	A9S	YES	NO	NO	NO
	A8	YES	NO	NO	NO
4K LCD	XH95	YES	NO	NO	NO
	XH90/92	YES	YES*	YES*	YES*
	XH85/91	YES	NO	NO	NO
	XH80/81	NO	NO	NO	NO

* Software update needed

Again, apologies for the confusion.

Cheers

Peter

[Josh009]

I'm not exactly versed in knowing a lot about this stuff. Are you saying that the eARC input doesn't rely on the current bandwith the other ports have? Does that mean it will take upless bandwidth than the others if you were running the tv at a higher spec when plugged into something like a PlayStation 5 at the other end? Or am i just making that up in my head 😂.

You'll have to describe it a bit better for me to understand, sorry. 

[Josh009]

Thanks Peter for the update. 

[rooobb]

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@Josh009  ha scritto:

I'm not exactly versed in knowing a lot about this stuff. Are you saying that the eARC input doesn't rely on the current bandwith the other ports have? Does that mean it will take upless bandwidth than the others if you were running the tv at a higher spec when plugged into something like a PlayStation 5 at the other end? Or am i just making that up in my head 😂.

You'll have to describe it a bit better for me to understand, sorry. 

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ARC/eARC are return channels features (ARC means literally Audio Return Channel), they send signal from the TV back to the compatible device (an audio device only).

Video signal go through an HDMI connection the opposite way (FROM the device to the TV)

The bandwidth allocated to each flow of the connection is not shared, so you cannot use less of ARC/eARC channel and more for the video signal. Nonetheless it seems that the port labeled as ARC/eARC on Sony tv may have more than the standard 18gbps on the video channel. But this is only speculation being that there is no statement from Sony on this.

Is it more clear?

Thanks @Peter_S.  for the clarification, i missed up things as well referring to A8 specification, but they are exactly the same of the A9

[Josh009]

Yes that clears things up for me, thank you very much. I do hope Sony could clarify if this Hdmi 2.1 input has more than 18gpbs bandwidth and it isn't just for the feature of eARC. I can't see it located anywhere in the manual stipulating otherwise.

Well atleast this has informed me of my options. All i wanted was to run this tv with 60hz4k with HDR10. I've since read about Chroma sub sampling with video games in particular and it seems to make very little to no difference from 4:4 4 to the lower 4:2:2, 4:2:0, unless you're using it as a PC monitor. Still the extra bandwith wouldn't go a miss. I'm completely uninterested in 120hz, it's not something i would ever notice if it's not present.

Anyway thank you again for your help, hopefully others will take advice from this to.