When an LG TV has picture but no sound, the Sound Test is the fastest way to separate TV speaker failure from HDMI, Bluetooth, or output settings. This guide is built around a simple rule: identify the exact device, model, symptom, and risk level before spending money on parts or service.
Device, model, and search intent
The target device is LG Smart TV, the model context is LG WebOS TV models with internal speakers, HDMI/eARC, optical audio, Bluetooth, or external soundbar output, and the visible problem is The LG TV has picture but no sound, sound only in one app, or external audio output fails. The code or alert to document is No sound / Sound Test failed. This matters because generic advice can be wrong when an error code has different meanings across brands or when a phone protects itself from heat or moisture.
Before changing settings, replacing a charger, ordering a pump, or booking service, write down the exact moment the issue appears. Does it happen at startup, while charging, during a drain cycle, after an update, under heat, or after water exposure? That timeline often separates an external condition from an internal failure.
First screen decision: continue, pause, or stop
If there is heat, water, smoke, electrical smell, swelling, a leak, or a repeated safety warning, the right move is to pause. Safe troubleshooting means external checks only: cables, hoses, filters, settings, airflow, and official documentation. It does not mean opening a sealed phone, touching appliance wiring, or bypassing a safety system.
If the device is still usable, gather evidence before resetting anything. Photos of the message, model label, battery screen, or appliance display can save time and prevent a technician from guessing. If the device is not safe to use, disconnect it only when you can do so without touching water or hot parts.
Signals that narrow the cause
- The picture works but there is no sound from TV speakers.
- Sound works in one app but not another.
- Sound returns when HDMI device or soundbar is disconnected.
- Bluetooth headphones or optical output were used recently.
- The LG Sound Test produces no sound.
Safe checks in order
- Check mute, volume, and whether headphones or Bluetooth audio are connected.
- Run the LG Sound Test from TV settings.
- Set Sound Out to TV Speaker for a clean baseline.
- Disconnect HDMI, eARC, optical, and Bluetooth audio devices.
- Test a built-in app and a different HDMI source.
- Restart the TV and update WebOS if available.
- If Sound Test fails with TV Speaker selected, stop and contact LG support or a technician.
How to read the result
A useful test changes only one variable at a time. If you change the charger, location, cable, app, hose, and filter all at once, you may make the problem disappear without learning what fixed it. Repeat the most important test under normal conditions before deciding that the issue is solved.
If the issue appears only with one accessory, room, cycle, load, or cable, the device itself may not be the root cause. If the issue appears across trusted accessories and normal conditions, the chance of a service-level fault rises. That is when your notes, photos, and official-source checks become valuable.
Quick decision table
| What you see | What it may suggest | Best next step |
|---|---|---|
| The issue appears only in one condition | External cause is possible | Change one factor and test again |
| The issue returns after safe checks | A part or sensor may need diagnosis | Stop repeated attempts and document results |
| Heat, water, burning smell, or battery swelling appears | Safety risk | Disconnect safely and seek qualified service |
Common mistakes that make this worse
Most expensive repair mistakes start with impatience: forcing a device to keep running, assuming one error code means the same thing on every model, or replacing parts without a documented reason.
- Replacing an HDMI cable before running Sound Test.
- Leaving Sound Out set to optical, Bluetooth, or eARC while testing speakers.
- Testing only one streaming app.
- Resetting the whole TV before noting which input failed.
- Ignoring intermittent sound after a soundbar or receiver update.
When home troubleshooting is not enough
Stop when the next step requires opening the device, measuring live electricity, handling a battery, touching water near power, moving a heavy appliance in an unsafe way, or bypassing a warning. A good repair decision is not only about cost; it is about avoiding damage, leaks, data loss, and personal risk.
When you contact support or a technician, ask them to connect the proposed repair to the exact symptom and model. A professional answer should explain why a part is likely faulty, what was ruled out, and what warranty applies after the repair.
Prepare this before contacting support
- LG TV model and WebOS version
- Whether Sound Test passes or fails
- Current Sound Out setting
- Connected HDMI/eARC/optical/Bluetooth devices
- Apps or inputs where sound fails
Prevention checklist
- Keep WebOS and soundbar firmware updated.
- Label HDMI/eARC ports and cables.
- Check Sound Out after using Bluetooth headphones.
- Test TV Speaker before changing several audio settings.
- Avoid forcing volume high when audio cuts in and out.
Related guides
- Arabic LG TV no sound guide
- LG TV Wi-Fi disabled guide
- Samsung TV network error guide
- TV and screen troubleshooting hub
Sources and references
This article uses manufacturer support pages and treats model-specific instructions as higher priority than generic forum answers.
- LG Support: Troubleshooting no audio on an LG TV
- LG Support: Troubleshooting no audio from TV
- LG Support: Performing a Sound Test
FAQ
Why does my LG TV have picture but no sound?
Common causes are mute, Sound Out set to an external device, HDMI/eARC issues, Bluetooth output, app-specific audio, or speaker failure.
What does LG Sound Test prove?
If Sound Test plays through TV Speaker, the TV speakers can work and the issue is likely input, app, or output settings. If it fails, service may be needed.
Should I reset the LG TV first?
No. Run Sound Test, check Sound Out, disconnect external devices, test apps and HDMI, and update WebOS before a full reset.