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No Dolby Digital if HDMI-CEC is on (PCM still works) - QN95A

(Topic created on: 15-03-2022 10:12 AM)
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scrollek
Journeyman
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Just purchased QN95A (with One Connect Box) and noticed the following behaviour:

When using HDMI-CEC functionality, TV is not sending Dolby Digital audio via either HDMI-ARC or Optical. It is simply dead quiet. PCM audio format works fine. Sometimes there is loud click when audio formats are switched before audio goes silent - like digital noise for a fraction of a second.

When HDMI-CEC is disabled, then I get both PCM and Dolby Digital audio formats via optical cable, HDMI cable in that case is not available for audio at all. The issue exists when HDMI-CEC is enabled on both AVR and TV (This is required to enable swicthing and volume control using TV remote).

Receiver is Yamaha RX-V473 (it suports HDMI-CEC, HDMI-ARC and audio formats ie. PCM, DD, DD+). Everything works without any issues with 2 year old Q80R.

Already tried: 6 various HDMI cables, resets, cold reboots, disconnecting power, etc. TV is on the latest firmware.

There are many posts regarding HDMI-CEC and ARC issues with Samsung TV but I didn't find anything about losing only Dolby Digital while PCM would still be working.

Obviously using only PCM audio format or disabling HDMI-CEC on brand new TV is not an option to me.

Any advice welcome.

26 REPLIES 26
ComoQ
Student
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 I am having the exact same problems with my new Q80. I have updated the software and it is not working.

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gotomasz
First Poster
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Po aktualizacji oprogramowania do wersji 2101 rozwiązało problem Netflix, amazon i cała reszta aplikacji w tv obsługują już dźwięk przestrzenny

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PaulM1
Moderator
Moderator
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Hi, according to my trusty translator, @gotomasz has confirmed the following:

"After updating the firmware to version 2101, Netflix solved the problem, Amazon and all the rest of the applications on the TV now support Surround Sound."

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gomezepor
First Poster
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 I am having the exact same problems with my new QN90B. Any Solution? Tanks!

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mr_markus
First Poster
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Same issue with Q80B and current firmware (1020). PCM works fine, but DD only via optical output.

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gomezepor
First Poster
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what is your soundbar?

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Duc Dinh
First Poster
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After a loss of time and money on myself cinema setups, I've see that one of the comments above was right, eARC is a high-bandwidth audio format DD, so ARC devices old will usually fail to decode and noise "tach tach' or only transfer to PCM instead of DD.

Same thing happens with my soundbar. in my old tv i can listen to DD via optical, after switching to DD+ only tv, my soundbar is noise with "tach tach" sound and sometimes only PCM is output.

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