LG 55UH770V - audio issues

[Ubergeeksov]

Hi,

 

I am hoping someone can help, as I've not been having any joy elsewhere.

 

I have an LG 55UH770V running the latest firmware/software.

 

I connect to my A/V receiver via HDMI 2 (ARC) and for TV apps (Netflix, Plex) have surround sound.

 

I connect my Xbox One and PS4 to HDMI 1 and 3 respectively. Up until yesterday I would then have surround sound, via ARC, playing from my A/V system for the PS4 and XBox One.

 

Yesterday, I noticed that the sound from the PS4 was only in stereo. On checking, the same is true for Xbox One. The Xbox will not even allow me to now select 5.1 or 7.1 in the audio set up, saying my receiver (i.e. the TV) does not support it. The TV apps, remain fine, playing surround sound

 

I cannot understand why this has suddenly happened or how to solve it.

 

Any help is appreciated.

[funmonkey100]

I had this problem with the same TV It used to work and then was only outputting stereo to my amp. I found out the problem was the sound out output for optical/HDMI arc under digital sound out was set to PCM and needs to be changed to Auto. I hope this works for you.

[funmonkey100]

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[Ubergeeksov]

Thanks FunMonkey. I have already tried that and it didn't seem to make a difference, but I will give it another go.

[funmonkey100]

I did also notice when I have both the internal speaker and digital out on at the same time it sent only stereo to the amp that was with Netflix app not sure about the hdmi inputs at the time only enabled digital out only as the fix for me.

[Ubergeeksov]

In the words of FE Smith, I am none the wiser, but better informed.

 

The problem appears to be limited to audio output from the consoles which is linear PCM. If I set the Xbox One or PS4 audio settings to bitstream and either Dolby or DTS, and provided that the digital sound out on the LG is set to auto (instead of PCM), then I have surround sound. However, if the audio output on the PS4 is set to linear PCM or on the Xbox One is set to uncompressed 5.1 or 7.1 (which I guess is linear PCM), then this is not detected by the TV, and I simply get stereo, irrespective of whether I have the digital sound out set to auto or PCM.

 

Will be calling LG tomorrow!

[Ubergeeksov]

Okay - "solved" this issue. The TV (nor TVs in general) does not support linear PCM passthrough other than 2.1. I have therefore configured both the XBox and PS4 to DTS output. Guess I was mistaken when I believed that it had been working previously.