Chromecast device not visible in Roon Web Displays (ref#IX4GCM) [Ticket in]

bernhardt.home · December 15, 2025, 11:59am

Hi! What’s not quite right with Roon?

· None of the above quite fits

None of the above quite fits

· None of these quite match

Tell us what's going on

· Chromecast device (LG OLED 83C31LA) Not visible in ROON Web Displays

Tell us about your home network

· UNIFI Dream Machine SE 2024 + Network + no VPN + no VLAN

vadim · December 15, 2025, 12:03pm

Hi @bernhardt.home, welcome to the Roon Community

Thanks for the details.

To clarify first — could you please check and share the exact webOS version running on your LG OLED 83C31LA?

Not all LG webOS versions support native Chromecast, and Roon Web Displays can only discover Chromecast-capable devices when the Chromecast service is actually present and active on the device.

Once we know the webOS version, we can confirm whether this model/OS combination should be discoverable by Roon or if this is an expected limitation.

bernhardt.home · December 15, 2025, 5:11pm

Hello! Chromecast Service is available over other units but ROON does not reach it. See the screenshots.

vadim · December 16, 2025, 12:05pm

Hello, @bernhardt.home.

Thank you for the update.

Please check if the TV is available in Settings → Audio → Chromecast.

bernhardt.home · December 16, 2025, 4:42pm

Hello,

No, it is just visible as an AirPlay-device. it hast only been visible for a short moment as web display/ chromecast audio device in the past. Never again.

benjamin · December 16, 2025, 8:02pm

Hi @bernhardt.home,

How is the TV connected to your router, as well as your Roon Server?

Is there an option to update the firmware on the LG?

From a recent Roon Server diagnostic report, we can see that Roon does initially see the LG via Chromecast successfully:

Info: [cast] discovered CastDevice[DeviceId=OLED83C31LA-..._googlecast._tcp.local, Name=OLED83C31LA, Address=192.168.1.47]

It then fails to classify the device:

Trace: [devicedb] [autodetect] No Match for DeviceAutodetectData[Type=Cast Model=OLED83C31LA]

This tells us Roon’s device database does not recognize this Chromecast as a valid Cast endpoint, so the TV advertises itself, but does not present the expected Cast profile.

A few additional troubleshooting steps for you to try:

Perform a factory reset on the TV
Temporarily check and disable IPv6 within your router settings

Let me know if either help, thank you!

dennis_mclaughlin · December 16, 2025, 9:37pm

I use an external Chromecast Ultra to display Roon
on my LG Oled G2 , this setup i found was better than the tv’s pre installed Chromecast.

bernhardt.home · December 17, 2025, 7:21am

Hello! There is no update available. I tried several things, in clouding hard-/ softreset and ipV6 en-/disabling. Nothing works at the moment.

vadim · December 17, 2025, 11:38am

Hello @bernhardt.home,

Thank you for your patience and for trying the suggested steps.

We’ve reviewed the diagnostics and confirmed that while the TV advertises itself as a Chromecast device, it does not expose a Chromecast profile that Roon can reliably classify as a supported Cast endpoint. We’ve reported this behavior internally to our R&D team for further review.

That said, since this appears to be a model-specific behavior tied to the LG TV’s Chromecast implementation, and not a widespread issue across Chromecast devices, any potential fix would likely take a significant amount of time and may ultimately depend on changes from the TV manufacturer.

At this point, the most reliable workaround remains using an external Chromecast device (such as Chromecast Ultra), as noted by another user in the thread.

We appreciate you bringing this to our attention and helping us document the behavior.

bernhardt.home · December 17, 2025, 1:28pm

Thank you very much!

vadim · December 17, 2025, 1:51pm

Hello @bernhardt.home

Thank you for the update. As soon as I have more information from the R&D team, I will update you here.

system · December 24, 2025, 1:51pm

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.

alex_h · January 13, 2026, 8:15pm

Hello @bernhardt.home ,

Thanks for your patience while we continue investigating the Chromecast behavior on your LG OLED TV (model OLED83C31LA).

To help us understand exactly what’s happening, we’d like to gather some more detailed diagnostics. Please follow the steps below carefully — this will allow us to see how the TV advertises itself on the network and why it disappears from Roon after a few minutes.

1) Restart Roon Server

Please restart your Roon Server and wait for it to fully come back online.

Once Roon starts, check whether the LG TV appears as a Chromecast or Web Display device in Roon during the first 3–5 minutes.
If it does appear and then disappears, please note this — it’s an important clue.

2) Reproduce the issue

After enabling both flags:

Restart Roon Server again
Wait until the LG TV first appears and then disappears from Roon
Let us know the time stamp (exact time + date) when problem is reproduced

4) Confirm Chromecast works outside of Roon

Finally, please confirm whether you can cast to the LG TV from another app or device (for example YouTube, Chrome, or another Chromecast-enabled app). We expect this to work, but we need to confirm.

Once we receive these logs, we’ll be able to see exactly how the TV advertises its Chromecast capabilities and why Roon loses the connection.

Thank you for your help — this information is essential for us to determine whether this is a compatibility issue, a network issue, or something we can address in Roon.

Best regards.