No sound from LG B5 to Wiim Ultra using HDMI

[Fralle]

Hi,

I’m having trouble getting audio from my LG OLED TV to my WiiM Ultra via HDMI ARC, and I’m hoping someone can help clarify what’s going on.
Setup:

TV: LG B5 OLED (2025 model, webOS)
Audio device: WiiM Ultra
Connection: HDMI cable from TV’s HDMI ARC/eARC port to HDMI input on WiiM Ultra

Problem:
The TV does not offer “HDMI ARC” as an audio output option.
The only available outputs are TV speakers or Bluetooth.
In the TV settings, eARC is greyed out / disabled and cannot be selected.
As a result, I get no audio from the TV to the WiiM Ultra over HDMI.

What I’ve tried:
HDMI cable is connected to the correct HDMI ARC/eARC port on the TV.
HDMI-CEC (LG calls it Simplink) is enabled on the TV.
Power-cycled both devices and reconnected the HDMI cable.

WiiM Ultra is powered on and connected before checking audio output settings.
Despite this, the TV never detects the WiiM Ultra as an HDMI ARC audio device, and HDMI ARC does not appear as a selectable output at all.

From my understanding, eARC being greyed out is expected if the connected device doesn’t support eARC — but HDMI ARC itself should still be available, which it isn’t.
Has anyone experienced this with WiiM Ultra and LG TVs? Is there a required setting on the WiiM Ultra to explicitly enable HDMI ARC?

Any guidance would be greatly appreciated.
Thanks!

 

[Fralle]

I found the solution. No need to answer this.

 

[QuarryHunslet]

I found the solution. No need to answer this.

If you post what the solution was, it might help others who have the same issue.

 

[Fralle]

It only worked one time and now it is back to Wiim not reacting at all when the TV is powered on. I don't have a clue what is going on. Any inputs would be appreciated.

 

[harkpabst]

What did you do to make it work one time?

 

[Fralle]

What did you do to make it work one time?

Actually I realise now it never did work. I used the remote and saw that that the volume did change on the ultra after settiing it to "pass-through". But the speakers was not connected at the time (I moved them to do the wall mount). Since the TV and Wiim where communicating after this change in the setting i took for granted everything worked.

But the thing now is that the volume changes when using the remote from the TV but there is no sound coming. Also the Wiim does not power on when powering on the TV. Some kind of communication between the devices must be going on at least.