Fix My TV Sound · 3D StudioSvenska

Model guide · TV

LG 77" C3 4K OLED evo Smart TV (2023)

Get sound working on LG 77" C3 4K OLED evo Smart TV (2023). Start with volume, audio output and your usual source, then follow the next check based on what you hear.

I have no soundHelp me reset it

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https://fixmytvsound.com/en/guides/lg-oled77c34la/

Model listed in Sweden · Model reference ↗

View product codes

Model code OLED77C34LA.AEU

Item number 602658

Support and manuals from LG ↗

Troubleshoot with your model

Model code: OLED77C34LA.AEU. Source market: Sweden. Match the whole code, including its suffix and generation, with the label or model information on your device.

Your model is preselected when you open the 3D guide. Also select the other device’s model if you use a separate audio system.

Start with these checks

  1. Play something and check volume

    Play a scene with speech. Cancel mute and raise the volume a little. If you use a TV box, check its volume too. Check whether sound is being sent to connected headphones.

    Does sound return? Replay the original programme and keep the audio output that worked.

  2. Compare TV speakers and the audio system

    Temporarily select the TV’s own speakers in its sound menu if offered. Listen to the same scene. The menu name and path depend on the model and software.

    Do the TV speakers work? Check the audio system’s input and connection. If the TV is also silent, compare sources in the next check.

  3. Compare programmes and sources

    Try another programme and a built-in TV app if available. Compare with your TV box or HDMI player. Note which sources produce sound.

    Is only one source silent? Check that source’s audio track, volume and output. If all sources are silent, run the model’s built-in sound test if its manual documents one.

  4. Check the connection you are using

    For a separate audio system, compare the socket labels with both manuals and select the matching audio-system input. Switch devices off before changing an accessible cable. Let any update finish first.

    Does a TV app work while the external player does not? Check the player’s connection and audio format. Change one setting at a time so you can identify what helps.

What is confirmed about this model’s connections?

These facts apply to the documented model variant. Check the other device’s connections and supported formats too.

Restart or reset?

A normal restart and a factory reset are different actions. Follow the model’s restart instructions and replay the same source. Wait for any software update to finish before disconnecting power.

The guide’s separate reset procedure may erase personal settings. Check the exact model and source market, record your settings and read what will be erased before confirming. A sound test or normal restart does not require a factory reset.

If the problem remains

Note the full model code, purchase country, selected source and input, cable type and which checks produced sound. Include any error message or indicator pattern. Manufacturer support can then continue from your results.

Black screen · TV will not turn on

Sources for the general checks

The checks above draw on manufacturer troubleshooting guidance. Use only connections and features present on your model; exact menus and reset sequences require that model’s own instructions.

TV sound over HDMI

HDMI 2 (eARC)

Look for number 2 next to the HDMI sockets on your TV. This input returns TV audio to a compatible soundbar or receiver.

LG Sverige · OLED77C34LA

Check my HDMI socket in 3D →

Full model codes on the label

The manufacturer lists these codes for this model.

Factory reset · OLED77C34LA

Check the model code and note your settings before clearing them.

  1. Open Settings, then All Settings.
  2. Select General and then System.
  3. Choose Reset to Initial Settings.
  4. Read the TV prompt. Confirm only if you want to erase the settings. Wait for setup to appear.
  5. Finish setup, select your usual audio source and test the same programme again.

Manufacturer support instructions · LG
Source market Sweden · Checked 2026-11-04

Model information from LG

Support for your country

Sverige · United States · Nigeria / Africa · Other countries

TV and speaker problems

Start with what you can hear or see. Each guide helps you compare sources, check a connection and decide what to try next.

All problem guides →