LG OLED C1/C2 DTS No Sound: Choose a Compatible Audio Route

Quick Answer

LG's 2021–2022 C1/C2/G1/G2 consumer TVs do not provide the same DTS decoding/pass-through behavior as newer LG generations. If a file or disc with a DTS soundtrack plays video but no audio through the TV path, do not assume the speakers, HDMI cable or eARC hardware failed. Confirm the selected track, then either let the source decode DTS to supported PCM, choose an alternate Dolby/AAC track, or connect the player directly to a DTS-capable receiver/soundbar.

The correct route depends on channel count and HDMI topology. Stereo PCM is broadly compatible. Multichannel PCM and lossless DTS require a source and audio device that support them and a path with adequate capabilities. Optical can be useful for diagnosis but cannot carry every modern lossless or multichannel PCM format.

Symptoms of a DTS Compatibility Problem

A movie has picture but silence only when the DTS track is selected.

Switching the same title to Dolby Digital, AAC or stereo restores sound.

TV menus and streaming apps produce sound normally.

A player connected directly to the receiver plays DTS, but the same player through the TV/eARC path does not.

The receiver display shows no codec lock or PCM when DTS was expected.

Plex/Kodi reports “direct play” for video but audio is unsupported or transcoded.

TV speakers are silent for one local file while ordinary broadcasts work.

Every source and every codec is silent. That is a broader output/hardware problem, not DTS-specific.

Audio cuts intermittently during an otherwise supported track. That is dropout diagnosis, not a missing codec.

Use one legally obtained disc or local file with known audio tracks. Random downloaded samples may have malformed containers or incorrect labels.

Causes: Codec, Decode and Transport

The TV does not decode the selected DTS path

Manufacturers license codecs by model generation. A television can support Dolby formats while lacking DTS decode/pass-through. Product specifications and manuals for the exact regional model are the authoritative source; a current G4/C4 guide should not be applied backward.

Pass-through is not the same as decoding

Decoding converts compressed DTS to PCM. Pass-through sends the original bitstream to another device. A TV might lack one or both behaviors. Selecting Pass Through cannot create a codec capability that the chain does not expose.

The player is configured for bitstream

A Blu-ray player, PC app or media box may send DTS untouched. If the TV is the next device and cannot handle it, silence results. Changing the player to decode compatible PCM can solve the issue without changing the file.

PCM channel/bandwidth limits

Stereo PCM is simple. Multichannel PCM generally needs HDMI/eARC and compatible channel negotiation; optical S/PDIF does not carry high-channel-count uncompressed PCM. A fallback to stereo may be expected if the path cannot negotiate more.

Container/app behavior

Plex, Kodi or another server may direct-play, transcode or reject a track based on reported client capability. The server dashboard shows whether audio is being transformed. A failed transcode or disabled server transcoding is not a panel fault.

Step-by-Step Safe Fix

1. Prove the audio track

Open the player's audio/subtitle menu and note the selected language, codec and channel layout. Switch to another included track. If Dolby/AAC/stereo works at the same timestamp, speakers and basic output are functioning.

Avoid trailers whose audio is unknown. On a PC, inspect the file with a trusted media-information tool rather than relying on its extension.

2. Test TV speakers

Select TV Speakers and play a known supported source. Then play the DTS title. Supported audio working plus DTS silence indicates capability/routing. If even menu sounds fail, follow LG's no-audio troubleshooting instead.

3. Inspect the exact model specification

Record complete model suffix and firmware. C1/G1 are 2021 and C2/G2 are 2022; their audio support differs from later LG TVs that reintroduced DTS-related capabilities. Do not assume “LG OLED” is one codec list.

4. Choose source decoding

Set the player to decode DTS to PCM. Begin with stereo PCM. If multichannel is required, connect over HDMI/eARC and verify that the receiver reports multichannel PCM. Do not select an artificial channel layout unsupported by the soundbar.

For Plex/Kodi, review the playback/server status. Permit audio transcoding to a compatible codec when direct DTS is impossible. Transcoding can use server CPU and may alter lossless quality, but it is safer than forcing unsupported TV behavior.

5. Route the player to the receiver

Connect Blu-ray/media player directly to a receiver or soundbar that explicitly supports the DTS format. Send video from that device to the TV. This bypasses the TV's audio handling.

Check video capabilities before making the topology permanent. An older receiver may decode DTS perfectly yet block 4K120, VRR or Dolby Vision. Consoles/PCs may need direct TV video and source-decoded PCM over eARC instead.

6. Test eARC with PCM

Use the LG port labeled eARC and the audio device's ARC/eARC output. Enable supported eARC/Simplink and choose a compatible Digital Sound Output. Verify stereo PCM, then multichannel PCM. A disappearing link is an eARC problem; steady stereo fallback is capability negotiation.

7. Compare optical only as a diagnostic

Optical can verify that TV audio output works with compatible stereo/compressed formats. It is not a universal DTS-HD Master Audio or multichannel PCM route. Do not downgrade the entire setup based on one successful optical test unless its limits meet your needs.

C1/C2 Topology Examples

Blu-ray with DTS-HD MA: player directly to a DTS-HD-capable AVR, AVR video to TV. If the AVR cannot pass desired HDR video, use a player with separate audio HDMI outputs or source decoding where supported.

Plex on webOS: DTS direct play may be unavailable. Configure server/client for compatible audio transcoding or use an external player whose decode/output path is known.

Windows/macOS PC: let playback software decode to PCM and verify OS speaker layout. A Mac/adapter/output path may expose only certain channel modes.

Console: console audio settings can convert output, but disc-app support and licensing differ. Use platform documentation and receiver display rather than assuming the game audio menu controls disc playback.

Cautions

Do not enter the service menu, install unofficial firmware or force a hidden codec flag. Codec licensing/support is not unlocked by TPC/GSR or factory panel settings. Do not repeatedly replace HDMI cables when every non-DTS format is stable; cables do not add decoders.

Avoid claiming that a future firmware will add DTS. Use the capabilities available now. If audio hardware supports DTS but loses lock intermittently, investigate firmware, eARC and cable separately.