Denon X3600 with Phillips 65PUS6703 TV Audio Issue

Gaz020

Standard Member
This has been a bit of an ongoing issue for me but seems to have gotten much worse recently.
I have the AVR connected via ARC, and Chromecast with Google TV and PS4 connected via the (HDR) HDMI ports on the TV. Note that HDMI 1 which supports ARC does not support HDR which is a huge frustration in itself.
The audio setup is Atmos 5.1.4.

The issue is that I can be watching something and all of a sudden the audio on all channels will start to distort. I would describe it as a sort of digital crackling which follows the audio, ie: the volume of the crackling follows the speech. To me it feels like some sort of decoding issue but I can't be sure.

Sometimes pausing and unpausing will make it go away, if watching TV, changing channel can help (I also get an issue more often on Freeview where changing channel results in no sound at all until channel is changed).

I found yesterday that in particular, with Amazon prime playing on the Chromecast and TV set to multichannel bypass for audio, the problem was at its worst, in fact it's the only time I've been able to forcebly replicate the issue.

I tried putting in my old Onkyo AVR with the Phillios TV for a few days and had no such issues. I also swapped the TV for my older but still 4K LG TV with the Denon AVR and also had no such issues.
The only thing I would say there is it's not a completely fair test, as the LG TV unlike the Phillips will not pass through Atmos. And likewise, the Onkyo is an older basic model and does not do Atmos, so in both cases I have to assume the audio format is going to be different from the Phillips/Denon setup.

List of things I have tried, to no avail:

  • Factory reset AVR and setup everything from scratch
  • As above for TV
  • Swapped and upgraded HDMI cables
  • Tested sources on both HDMI 2 and 3, problem never occurs on the PS4 regardless of which port it's connected to
  • Run HDMI separately to avoid potential interference issues
  • Run optical cable instead of ARC
  • Tried various audio settings on TV and Amp, whilst changing to stereo does take the audio issue away, I certainly don't consider it a fix!

All of the above leads be to guess that it's an issues specific to audio decoding or passthrough in the TV, on decoding in the AVR. Most likely a hardware fault.
Though it's intermittent, I don't think it relates to heat, as I've seen the issue persist when both devices have just been turned on, equally it can be on for some time before it happens.

I am already speaking to the manufacturers as both are under warranty, but thought I'd see what people's thoughts are on here?

Thanks
 

Gaz020

Standard Member
Just another thing to add. Where last night I was able to replicate the problem on Amazon prime repeatedly, ie: the problem was there regardless of whether I rebooted all devices, changed cables etc, today I have tried the same film with same settings and no audio issue!

I've even tried turning on/ off certain electrical equipment in case is interference on the AC side with no luck.

Any ideas please or does this sound like faulty hardware?
 

Iancoates

Standard Member
I know it does not help, but I have a silmilar problem with similar setup, avr X 3600 and Phillips 65 PUS6753 tv. Distorted crackles on some hdr tv channels and I also loose sound when I change the tv channels and then have to switch off the avr. All this has started a couple of weeks ago.
 

Gaz020

Standard Member
Well its certainly interesting to hear I'm not the only one. Before I bought the Denon, I had a 10 year old Onkyo hooked up, and before I replaced the TV I had a 5 year old LG with WebOS. I can't help but feel from the day I got the Philips TV, that there were some underlying frustrations over the LG- menu system is horrible and slow, clicks and pops changing channels and inputs.
I wonder if the Denon, rather than being at fault is more sensitive and so highlights some potential processing or passthrough issues of the TV, though it's really impossible to say as I have also upgraded the Chromecast and whereas a year ago I was only passing through Dolby digital, I'm now using Atmos where it's available.

Most strange though is that having suffered for weeks with the issue it's pretty much stopped dead (bar the odd click at the start of a film).
It stopped after one evening I was experimenting with the setup and did the following-

I found that using Amazon prime on the Chromecast is the easiest way to replicate the fault, put a film on which had previously displayed the issue. Both TV and AVR were turned on from cold.
After initially there were no audio issues, but after about 30 minutes they appeared.

I then turned off and unplugged the AVR and used the internal speakers of the TV which were fine, reconnected the AVR and the issue was still there on the AVR.
I left the AVR off for about an hour but left the TV on, reconnected and the issue was still there.

So I tried the opposite. I turned the TV off and the AVR on, played music through the AVR for about an hour using the inbuilt Spotify app to keep the AVR warm whilst I let the TV cool down.

I then put the TV and same film back on throught the AVR and no audio issue and not had an issue since.

In trying the above I was expecting to determine that perhaps heat was causing one or other device to cause the issue. For reasons I can't explain the fault has not returned.
 

Gaz020

Standard Member
I spoke too soon, after 2.5 weeks the issue has reappeared this morning!
 
Last edited:

Darbo

Active Member
I spoke to soon, after 2.5 weeks the issue has reappeared this morning!
I would consider not using arc, use optical instead, i used to have this tv and arc is terrible but optical works a treat, in fact this seems to be a thing with Philips televisions across the board.
 

Gaz020

Standard Member
I have tried optical for the purpose of fault finding, the fault was still there. Even it it wasn't it's unfortunately not a long term solution as optical does not support Atmos, on top of that it does not provide CEC.
 

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