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Question

LG C5 TV and Sonos Amp HDMI

  • September 23, 2026
  • 6 replies
  • 28 views

I have been trying to connect for some time now and have exhausted menu options between the two. Any help greatly appreciated.

 

I have a new LG C5 TV connected to the Sonos amp via approximately 12 feet active HDMI cable running from the TV to the amp in the basement. Well, I can get sound initially though ultimately cannot switch to another tv audio source. I can never revert back to television speakers nor play music from the amp. Additionally I have found that this will put the amp into a protected mode (blinking orange). I did not have any power source connected to the HDMI cable (active). I have read throughout this forum the incompatibility between the CEC HDMI arc and the LG line. I also have two HDMI cables routed in opposite directions.  I have tried every menu option available on the amp via Sonos as well as the television. (Powering down and restarting as well). I even tried a new amp.  But before I go about changing the cables, (which would take considerable work to reroute) I would like to see if this even makes sense before doing this. Thank you!

 

6 replies

  • September 23, 2026

If your amp is going into fault mode, you should check the speaker wiring:

No sound from Amp with a flashing orange and white light

As a test I would connect the Amp to the TV ARC/eARC with a regular HDMI cable, wire two speakers and see if everything works correctly. Then you’ll at least know if there’s a problem between the TV and Amp. Anyway, it’s a good place to start.


  • Author
  • Contributor I
  • September 23, 2026

Thank you. The amp has no fault when playing music regularly for months at all volumes and types of music.  I suppose my next step may try that.  Was thinking also about the optical hdmi adapter. Also did try a cec blocker and they prohibited any sound. Appreciate the thoughts. 


AjTrek1
  • September 23, 2026

Where are the speakers located the Amp is supposedly powering for TV audio?


buzz
  • September 23, 2026

Do these active HDMI cables support HDMI-eARC? Most do not.


  • Author
  • Contributor I
  • September 23, 2026

Approximately 20-25 feet in the ceiling a room above. 


buzz
  • September 23, 2026

What model HDMI cables are you using?