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Your Sonos Beam plays music from the app perfectly — but there’s dead silence when you switch to the TV. Before you assume the soundbar is broken, know this: in the large majority of cases, the Beam is fine and the problem is the HDMI handshake between your TV and the soundbar. This guide walks through the correct setup and then the fixes, in the order that actually resolves the issue.
A note on how this guide was written: we haven’t reproduced these faults in a lab. The sequence below is synthesized from Sonos’s official support documentation and the fixes most widely reported as working by Sonos Community members and specialist press. No invented error messages, no fabricated testing.
The 30-second diagnosis: is it the TV or the Beam?
Play any music through the Sonos app. If the Beam plays it normally, your Beam is working and the problem is on the TV/HDMI side — the speaker, its amplifiers, and its network connection are all fine. Everything below targets the TV connection. If the Beam is silent for music too, skip to the last section — that’s a different problem.
How the connection is supposed to work
The Beam connects to your TV with a single HDMI cable, but not just any port: it must go into your TV’s HDMI-ARC (or eARC) port — usually labeled “ARC” or “eARC” right next to the socket, often HDMI 1. ARC stands for Audio Return Channel: it’s the one HDMI port that can send audio backwards from the TV to the soundbar. Plug into any other HDMI port and you’ll get silence, because those ports only receive.
Two companions make ARC work. CEC (Consumer Electronics Control) is the control signal that lets the TV and soundbar talk to each other — it’s what lets your TV remote control the Beam’s volume. And your TV’s audio output setting must actually route sound to that port. All three — right port, CEC on, audio output set — have to be correct simultaneously. Miss any one and you get silence.
The correct setup sequence (first time)
If you’re setting up for the first time, do it in this order — the order matters:
- With everything powered off, connect the Beam to the TV’s HDMI-ARC/eARC port using the HDMI cable supplied by Sonos.
- Power on the TV first, then the Beam.
- On the TV, enable HDMI-CEC (see the brand table below — every manufacturer calls it something different).
- Set the TV’s audio/sound output to HDMI-ARC (not “TV speakers”).
- In the Sonos app, run TV Setup under the Beam’s room settings and follow the prompts — the app will test the connection.
- Only after the Beam is working, reconnect your other HDMI devices (cable box, console, streaming stick) one at a time.
The fix checklist, in order
Work through these in sequence — don’t skip ahead. Each step eliminates one common cause.
1. Confirm the port. Physically check that the HDMI cable is in the port labeled ARC or eARC on your TV. On many TVs only one of the three or four HDMI ports supports ARC. If you recently moved cables around (new console, new streaming stick), this is the prime suspect.
2. Turn on HDMI-CEC on the TV. This is the single most common cause of “was working, now silent” — a TV firmware update or settings reset can switch CEC off without telling you. Find your brand’s name for it in the table below and make sure it’s enabled.
3. Set the TV’s audio output correctly. In the TV’s sound settings, the output must be set to HDMI-ARC / external speaker / soundbar — not TV speakers. While you’re there, check the digital audio format: set it to PCM/Stereo or Dolby Digital to start with. If your TV is outputting DTS and you have the original Beam (Gen 1), that’s your problem — the Gen 1 Beam can’t decode DTS, so switch the TV to Dolby Digital or PCM. (The Beam Gen 2 and Beam Ultra handle DTS fine.)
4. Reseat the cable. Unplug the HDMI cable at both ends, check it isn’t bent or kinked, and push it firmly back in until it’s fully seated. HDMI connectors work loose over time, especially on wall-mounted TVs. If you have a spare known-good HDMI cable, try swapping it — cables do go bad.
5. Power-cycle both devices properly. Don’t just use the remotes — unplug the TV and the Beam from the wall, disconnect the HDMI cable, wait a full 60 seconds, then reconnect the HDMI cable and plug both back in (TV first, then Beam). This clears the HDMI handshake state, which is the actual mechanism behind most “it worked yesterday” failures. Sonos Community moderators recommend this as the first real fix for a reason.
6. Remove other HDMI devices temporarily. Unplug everything else from the TV’s HDMI ports (consoles, streaming sticks, cable boxes) and test the Beam alone. If sound returns, reconnect the other devices one by one to find the one causing the conflict — some devices fight over the CEC bus.
7. Re-run TV Setup in the Sonos app. Go to the Beam’s room settings → TV → TV Setup and run through it again. If the app reports it can’t detect the ARC connection even though the cable is in the right port, that’s useful information — it points squarely at the TV’s CEC/ARC implementation rather than the Beam.
8. Update firmware on both ends. Check the TV for a software update (TVs ship ARC bug fixes more often than you’d think) and check the Sonos app for system updates. Then repeat step 5.
What each TV brand calls HDMI-CEC
| TV brand | Their name for HDMI-CEC | Where to find it |
|---|---|---|
| Samsung | Anynet+ | Settings → General → External Device Manager → Anynet+ (HDMI-CEC) |
| LG | SimpLink | Settings → General → Devices → HDMI Settings → SimpLink |
| Sony | BRAVIA Sync | Settings → Watching TV → External Inputs → BRAVIA Sync settings |
| Panasonic | VIERA Link | Setup → VIERA Link settings |
| Philips | EasyLink | Settings → General → EasyLink |
| TCL / Roku TV | Control other devices (CEC) | Settings → System → Control other devices |
| Vizio | CEC | Menu → System → CEC |
Menu paths move between model years, so if yours differs, search your TV’s settings for the CEC name — it’s always there somewhere. Also note: on some TVs, ARC only works when CEC is enabled; they’re tied together, so a TV with CEC off may grey out the ARC audio output option entirely.
The optical adapter fallback
If HDMI-ARC simply won’t cooperate — an older TV with a flaky ARC implementation, or a port that seems dead — the reliable fallback is optical. The Beam Gen 2 ships with an HDMI-to-optical adapter in the box; Sonos also sells the adapter separately. Connect the adapter to the Beam, run an optical (Toslink) cable from the adapter to your TV’s optical output, and set the TV’s audio output to Optical.
Trade-offs to know: optical can’t carry Dolby Atmos (it maxes out at Dolby Digital 5.1), and you’ll lose the TV-remote volume control that CEC provides — you’ll control volume through the Sonos app or a programmed universal remote instead. But it’s a rock-solid connection that sidesteps every HDMI handshake problem, and for many setups it’s the pragmatic answer.
When it’s the Beam, not the TV
If the Beam is silent for everything — no music from the app, no TV audio — the checklist above won’t help. Try these:
- Check the status light: no light at all means no power (try a different outlet and cable). A flashing light means it’s still booting or updating — give it a few minutes.
- Make sure the Beam is on your Wi-Fi network and visible in the Sonos app. If the app can’t see it, that’s a network/setup problem, not an audio problem.
- If the app sees the Beam but nothing plays from any source, reboot it (unplug 10 seconds), then check for system updates.
- As a last resort, factory-reset the Beam and set it up fresh. If it’s still silent after a reset with a known-good network, that’s a hardware fault — contact Sonos support while it’s under warranty.
Lip-sync issues? That’s a separate fix
If you have sound but voices don’t match mouths, the usual culprit is the TV’s audio processing delay. Look in your TV’s sound settings for “AV Sync,” “Lip Sync,” or “Audio Delay” adjustment and nudge it until dialogue lines up. This crops up more often with optical connections than with HDMI-ARC, and enabling your TV’s game mode (which cuts processing) often reduces it.
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