How to Restore TV and Soundbar Audio After a Firmware Update

Why this problem is timely now

Autumn is when television audio faults become especially visible. Households return to longer evening viewing, football, games and streaming launches, while manufacturers continue shipping firmware and app updates across TVs, soundbars and media players. UK technology coverage regularly treats TV software as an ongoing platform rather than a finished product, and manufacturer support pages increasingly include post-update restart, HDMI control and audio-format checks.

Community support threads show the same frustrating pattern: sound worked yesterday, an automatic update arrived overnight, and now the soundbar displays no signal, the TV falls back to its own speakers, Dolby Atmos disappears or only one streaming app is silent. Sometimes the update genuinely contains a bug. Often it has changed an output mode, restarted HDMI control badly or exposed an old handshake problem that had previously been hidden.

This guide is deliberately recovery-led rather than product-led. The latest DigiTech article was a five-product PC and Desk Setup comparison, while Audio Gear was the least recently used category in the current rotation. A controlled troubleshooting article also avoids repeating the recent Sonos buying guide: the question here is how to make the equipment already in the room work again.

Before touching anything, define the fault precisely

“The sound is broken” is not a useful diagnosis. Spend five minutes finding the boundary of the failure. Try a live television channel if available, one built-in streaming app, a different built-in app and one external HDMI device. Then switch temporarily to the TV’s internal speakers. Note whether sound is completely absent, intermittent, delayed, restricted to stereo or missing only on a particular format.

If the TV speakers work on every source but the soundbar does not, concentrate on the ARC/eARC connection, HDMI control and soundbar input. If neither the TV speakers nor soundbar works in one app, the app or its selected soundtrack is the stronger suspect. If an external console is silent while internal apps work, test the console’s audio format and HDMI path. If everything is silent, check global mute, output selection and the update status before dismantling the installation.

Write down the exact TV, soundbar and streamer models plus their firmware versions. Photograph the current audio menus with your phone. That gives you a route back if experimentation makes matters worse and provides useful evidence if the manufacturer needs to investigate.

Do not confuse an update screen with a completed update

Some devices restart more than once, continue optimising apps after the picture returns or finish updating connected modules in the background. Confirm that the TV and soundbar both report the expected software version and are no longer displaying an installation, maintenance or restart prompt. Do not remove power while an update is actively being written.

If an update appears stuck, follow the manufacturer’s model-specific instructions rather than improvising. The safe recovery procedure for a television may differ from the procedure for a soundbar, wireless subwoofer or streaming box. A forced interruption at the wrong point can turn an audio inconvenience into a device that no longer boots.

Once the update is definitely complete, disable automatic playback and pause anything that could wake the system while you work. You want a stable test environment, not a console turning on the television halfway through a handshake reset because HDMI-CEC has decided to be helpful.

Step 1: establish a TV-speaker baseline

Select the television’s internal speakers in its sound-output menu. Disconnect Bluetooth headphones and stop casting sessions. Play a known source such as a normal broadcast channel or a familiar built-in app. Start at a modest volume and confirm whether both speech and programme audio are present.

If the internal speakers are silent, check mute, accessibility audio options, headphone output, Bluetooth routing and any “audio system only” setting. Restart the TV through its on-screen power or restart command if one exists. A quick press of the remote’s power button may only place the set in standby; it does not necessarily reboot the operating system.

If internal sound returns, leave it working for several minutes and test two sources. You have now proved that the TV can decode and reproduce audio. The remaining problem is likely between the TV and soundbar or within a specific source format. If the TV speakers remain silent across every source, skip ahead to the app, firmware and manufacturer-support sections rather than spending an hour changing ARC settings.

Step 2: perform a complete power and HDMI restart

HDMI equipment remembers device identities, supported formats and control relationships. An update can leave that information inconsistent. A proper restart clears more state than repeatedly switching inputs.

1. Turn off the TV, soundbar and every connected HDMI source.
2. Wait until update activity and drive indicators have stopped.
3. Unplug the TV and soundbar from mains power. Unplug external streamers and consoles where practical.
4. Disconnect the HDMI cable between the TV and soundbar at both ends.
5. Wait at least two minutes. Use this time to confirm the cable goes from the TV’s labelled ARC/eARC socket to the soundbar’s HDMI OUT (TV ARC/eARC) socket.
6. Reconnect only the TV-to-soundbar HDMI cable.
7. Restore power to the soundbar, then the TV. Allow both to boot fully before pressing more buttons.
8. Select the soundbar’s TV, ARC or eARC input and select the television’s external audio-system output.

The order is not magic, but simplicity matters. Leaving consoles, switches and streaming devices disconnected removes extra HDMI-CEC messages while the television and soundbar rediscover each other.

Step 3: restore HDMI-CEC, ARC and eARC deliberately

ARC carries television audio back down an HDMI connection that also handles video in the other direction. eARC expands audio capability and uses a more robust data channel, but both normally depend on the correct sockets and settings. HDMI-CEC provides device control and is often branded rather than named plainly: Anynet+, Bravia Sync, Simplink, Viera Link, EasyLink and other labels all refer to versions of the same family of control functions.

After an update, verify that HDMI-CEC remains enabled on both devices. Then check ARC or eARC. If eARC is set to Auto and audio is absent, temporarily disable eARC and test ordinary ARC. If ARC works, re-enable eARC after another restart. This does not prove eARC is permanently broken; it proves the basic return-audio path exists and narrows the problem to negotiation or format support.

Some televisions include a device-discovery or HDMI-device-list screen. Run it after the simple TV-and-soundbar connection is stable. Avoid renaming or reorganising every HDMI input during diagnosis. Cosmetic tidying can wait until sound survives several restarts.

Step 4: simplify the digital audio format

Audio-format settings commonly include PCM, Auto, Bitstream, Pass-through and manufacturer-specific wording. The most capable setting is not automatically the best diagnostic setting. Begin with a format both devices should understand.

Set the TV’s digital audio output to PCM and play ordinary stereo material. If sound appears, the physical connection and basic return channel are working. Change to Auto or Pass-through only after the baseline is stable. Then test Dolby Digital, Dolby Digital Plus and Atmos content separately. Do not jump from silence straight to the most complicated lossless format and assume the cable is the only variable.

External devices add another format decision. A games console may offer uncompressed PCM, Dolby or DTS. A streaming box may match content automatically or force a format. During recovery, choose Auto or a widely supported PCM/Dolby option. If only DTS titles fail, check whether the TV can pass DTS to the soundbar; many models cannot, regardless of what the soundbar itself supports.

Record which setting restores sound. If PCM works but pass-through fails only after the update, that is valuable support evidence and a usable temporary workaround.

Step 5: add sources back one at a time

Reconnect one external device and test it before adding the next. Begin with the device used most often. Confirm picture, stereo sound, surround sound, volume control and wake-from-standby behaviour. Then shut the system down and start it again. A setup that works only until the next morning is not fixed.

If one device breaks the whole chain, disconnect it and confirm that normal TV-to-soundbar audio returns. Check that device’s HDMI-CEC setting, output format and firmware. Some consoles and streamers assert themselves as the active source during boot, which can make the soundbar switch away from TV audio. Others remember a format the updated television no longer accepts.

If you use an HDMI switch, AV receiver, capture device or synchronisation box, leave it out until the direct route works. Then reintroduce it as a separate test stage. Every additional box expands the handshake and makes fault isolation harder. “It worked before the update” is useful history, but it does not identify which participant now disagrees.

When only one streaming app has no sound

If live television and other apps work, stop changing global HDMI settings. Open the failing app’s playback controls and select a different audio track. A title may default to Atmos, audio description or a language variant that triggers the fault. Try another programme in the same app because a single asset can be incorrectly encoded.

Fully exit the app, clear its cache where the platform allows, then restart the television. Sign out and back in only if a normal restart fails. Reinstall the app if the TV platform supports it, but record login details and profile settings first. Check whether the same account and title work on a phone, tablet or browser; that separates an account or service problem from the television app.

Also check service status and recent app reviews before factory-resetting the TV. If hundreds of users lost sound in the same app on the same day, changing ten local settings is unlikely to cure the service’s deployment.

When sound works but Atmos, surround or volume control disappears

A partial failure is usually more informative than complete silence. If stereo PCM works but Atmos does not, verify eARC, pass-through and source-format support. Built-in apps often deliver Atmos as Dolby Digital Plus over ARC, while an external disc player or console may use Dolby TrueHD or multichannel PCM that needs eARC. The logo on the soundbar does not guarantee that every television input passes every format.

If surround channels disappear, confirm the soundbar has not switched to a night, voice or stereo mode. Check whether the source is actually providing surround sound; menus, adverts and older programmes may be stereo. Use the soundbar’s information display or companion app to see the received format rather than judging from one quiet rear speaker.

If the TV remote no longer controls soundbar volume, HDMI-CEC may be the only broken layer. Re-run device discovery, check remote-control settings and remove duplicate infrared programming before resetting audio formats that already work. If volume works but the TV shows two competing on-screen volume indicators, disable any redundant universal-remote profile after the HDMI path is stable.

When the sound is delayed or drifts out of sync

Post-update processing changes can alter lip sync even when sound is present. First disable optional picture processing such as motion smoothing and excessive noise reduction. Game mode often reduces video delay and can reveal whether the picture pipeline is the cause. Then set both the TV and soundbar audio-delay controls to zero before adding compensation.

Test a built-in app and an external source. If the built-in app is synchronised but the console is not, adjust the console path rather than the whole system. If every source has the same fixed delay, use one device’s adjustment control—not both—so you can understand the direction and amount of correction. Wireless rear speakers and Bluetooth links can introduce their own latency and should be removed from the first test.

For a deeper lip-sync procedure, use DigiTech’s dedicated TV audio delay and lip-sync guide. The important rule is to establish which source and processing stage owns the delay before adding milliseconds at random.

Should you replace the HDMI cable?

Not first. A firmware update cannot physically downgrade a sound cable overnight. However, an update may enable eARC, a higher-bandwidth video mode or a different control path that exposes a marginal cable. Inspect the existing lead for damage, sharp bends and loose connectors. Reseat both ends and test a short known-good cable if one is already available.

Use the cable type appropriate to the full signal path. Ordinary ARC and compressed audio do not need exotic marketing. eARC and modern 4K/120Hz gaming paths are better served by a certified Ultra High Speed HDMI cable, especially when the same lead also carries demanding video. Keep the test cable short and connect directly; wall plates, extenders and switches can be added later.

No affiliate cable was included in this article because the three direct Amazon UK candidates tested by the required HTTP-first canonical parser did not expose an accepted Amazon merchant field, so none produced a compliant pass. That is a better outcome than forcing a convenient-looking link into a recovery guide.

Factory resets are a late step, not an opening move

A reset can remove account logins, channel tuning, calibration, accessibility settings, input names, network credentials and picture adjustments. It may also fail to remove the current firmware, which means the suspected software remains while all your useful configuration disappears.

Before resetting, export or photograph settings, record Wi-Fi details and check whether the manufacturer has published a targeted recovery step. Reset the least disruptive device first. If an external streamer alone is faulty, reset or reinstall that device before erasing the television. If the soundbar can reset its HDMI relationship without deleting room calibration, use that narrower option.

After a reset, rebuild the simple path: TV speakers, direct TV-to-soundbar connection, PCM audio, then one source at a time. Do not restore every old setting immediately. If the fault returns only after a particular option is enabled, you have found something useful rather than merely completed a ritual.

Know when to stop and contact support

Stop local troubleshooting if the television or soundbar repeatedly reboots, becomes unusually hot, displays an update or recovery error, loses power, produces electrical smells or cannot complete startup. Disconnect unsafe equipment and use the manufacturer’s official support route.

For a software fault, provide a concise test record: exact model numbers, firmware versions, update date, whether internal speakers work, whether PCM works, whether ARC works with eARC disabled, which sources fail and whether a direct known-good HDMI connection changes the result. Include photographs of error messages and a short video if the failure is intermittent.

Ask whether the issue is known and whether another firmware build, service-mode procedure or authorised rollback exists. Do not install firmware intended for a similar-looking model or another region. A model suffix can represent different tuners, panels or boards. Random USB firmware from a forum is not a recovery plan; it is a second incident waiting to happen.

Recovery decision table

A repeatable ten-minute recovery sequence

1. Test TV speakers with two known sources.
2. Record models, firmware versions and audio settings.
3. Confirm every update has fully completed.
4. Disconnect external HDMI sources.
5. Power down, unplug and disconnect the TV-to-soundbar HDMI cable.
6. Reconnect only TV and soundbar through the correct ARC/eARC sockets.
7. Enable HDMI-CEC and ARC; begin with eARC disabled if necessary.
8. Set digital audio to PCM and prove basic sound.
9. Move to Auto or Pass-through, then test required surround formats.
10. Add one source at a time and test restart, standby and wake behaviour.

If the failure appears at a specific step, stop there. Repeating the whole sequence while changing three other settings destroys the evidence you just created.

Related DigiTech guides

• How to Set Up a Soundbar Properly in a UK Living Room
• How to Fix TV Audio Delay and Lip-Sync Problems
• How to Improve TV Dialogue Clarity
• How to Cut Streaming Subscription Waste Before Buying Another TV Stick

Final verdict

A post-update audio failure is easier to solve when treated as a system boundary rather than a reason to reset everything. Prove the television can make sound, reduce the installation to TV plus soundbar, rebuild ARC or eARC with a simple PCM format, then reintroduce codecs and sources one at a time.

The method is intentionally dull. Dull is useful when four devices are all trying to wake, switch input, negotiate formats and control volume at once. If a manufacturer bug is responsible, the same controlled tests give support something better than “no sound, please help”. If a setting or handshake is responsible, you can identify the exact step that restores it—and avoid buying a replacement cable because a software update had a sulk.

Editorial notes

Lightweight UK trend research compared three candidate areas: post-update TV and soundbar failures, autumn smart-heating setup, and Wi-Fi 7/Wi-Fi 8 upgrade decisions. Current UK technology coverage and manufacturer support material showed continuing television-platform and firmware activity; community discussions showed recurring eARC, HDMI-CEC and app-only no-sound faults; and autumn viewing and seasonal television-buying coverage provided a clear practical hook. Smart-heating and next-generation Wi-Fi were rejected because DigiTech covered both areas recently.

The editorial rotation guard reported three product-led and five utility-led articles in the latest eight, so another five-product article was not required. Audio Gear was the least recently used category and did not appear more than three times in the latest seven posts. This article contains no full product sections and no contextual affiliate link: three relevant HDMI cable pages were checked through the required HTTP-first canonical parser, but all failed the accepted merchant-field requirement.

Review freshness

Last reviewed: 30 September 2026

Update cadence: Review after major television, soundbar, HDMI-CEC, eARC or streaming-platform firmware changes.