LG TV No Sound: Complete Diagnostic, Fixes & When to Repair or Bin It
The picture is fine. The TV turns on, the channels change, the apps load. There’s just no sound. Or the sound cuts in and out. Or it only comes from one speaker. Or it worked yesterday and now it’s gone.
For the full index of LG TV faults — sound, power, picture, remote, and connectivity — see LG TV Problems: Troubleshooting Guide to Every Common Fault.
Here’s the thing most people get wrong: they assume the speakers have failed and start looking for a repair. In reality, no sound is often a setting, a cable, or a stuck headphone jack sensor — all three are free to fix. Only when those are ruled out does the fault move to the speakers, the amplifier, or the main board. And even then, there’s a cheaper alternative: external speakers or a soundbar, which often cost less than the repair and sound better than the TV’s internal speakers.
This post walks through the audio chain in order, tells you how to isolate the fault, and shows you how to decide between repairing the TV and adding external audio. For the full LG TV fault reference in one place — picture, sound, power, apps, and connectivity — see the LG TV Fault Diagnosis Guide →
Quick Checks Before You Open Anythingre switched off. This is the simplest and most common cause.
Symptoms:
No sound at all on any input
Mute icon on screen that won’t clear
Volume stuck at zero or won’t increase
Sound disappeared after someone used the TV or changed a setting
How to test it:
Press the mute button to clear any mute state. Turn the volume up and confirm the on-screen bar moves. Then go into Settings → Sound → Sound Out and check it’s set to TV Speakers. If it’s set to Optical, HDMI ARC, Bluetooth, or any external output, switch it back. On newer LG TVs this is under Settings → Sound → Sound Out → TV Speaker.
Cost: $0.
Repair or Bin? Repair. Free, and it resolves a significant share of cases.
2. Wrong Audio Input Setting on the Source Device
Why it stops the sound: The source device — set-top box, console, streaming stick, or Blu-ray player — may be set to output audio through a connection that isn’t being used. The TV is fine; the source is sending sound somewhere else.
Symptoms:
No sound on one input only
Sound works on the TV’s own apps but not on an external source
The source device’s display shows an audio output setting
How to test it:
Open the source device’s audio settings and confirm it’s set to output over HDMI (or the connection you’re using). For a set-top box, check the audio output isn’t set to optical or analogue. For a console, check the audio output isn’t set to a headset or a different connection. Also check the source device isn’t muted and its volume is up.
Cost: $0.
Repair or Bin? Repair. Free setting change.
3. Loose or Faulty HDMI Cable
Why it stops the sound: HDMI carries both audio and video. A damaged cable can carry a perfect picture and no audio — the audio pins or conductors fail while the video ones hold. A loose connection does the same.
Symptoms:
Picture is fine, sound is missing
Sound cuts in and out
Sound works on some inputs but not others
The fault started after moving the TV or the connected device
How to test it:
Unplug and reseat both ends of the HDMI cable. If that doesn’t fix it, try a different HDMI cable — this is the fastest test. If a different cable works, the original was the fault. Also try a different HDMI port on the TV, since a single failed port can cause the same symptom.
Cost: $5–$20 for a replacement cable.
Repair or Bin? Repair. Cheap and simple.
4. Failed Headphone Jack Sensor
Why it stops the sound: The TV mutes the internal speakers whenever it detects headphones in the jack. If the sensor sticks, the TV thinks headphones are connected permanently, and the speakers stay muted. This is a common cause that most people never suspect.
Symptoms:
No sound from the speakers, but sound works through headphones
Headphone icon on screen with nothing plugged in
The fault started after headphones were used
Volume control works but no sound comes out
How to test it:
Plug a pair of headphones in and pull them out several times — this can free a stuck sensor. Shine a light into the jack and check for debris or a bent contact. If the headphone icon stays on screen with nothing plugged in, the sensor has failed.
Cost: $0 to free it. $20–$50 for a replacement jack if the sensor is genuinely dead.
Repair or Bin? Repair. Free to try, cheap to replace.
5. Failed Internal Speakers
Why it stops the sound: The internal speakers age, especially if the TV has been played at high volumes for years. When they fail, the headphones may still work — which confirms the fault is in the speaker stage, not the audio processing.
Symptoms:
Sound through headphones but not speakers
Sound only from one speaker
Distorted or crackly sound
Sound cuts in and out at higher volumes
How to test it:
Plug in headphones. If the headphones work and the speakers don’t, the audio processing is fine and the fault is the speakers or the amplifier. This is the test that separates the two stages. Testing the speakers themselves requires opening the TV and measuring resistance across the speaker terminals — a technician task on most sets.
Cost: $20–$50 for a replacement speaker pair.
Repair or Bin? Repair on a TV under five years old. On an older set, weigh the repair against the cost of external speakers.
6. Failed Audio Amplifier
Why it stops the sound: The audio amplifier boosts the signal to the speakers. When it fails, you get no sound at all, or very faint sound, even though the speakers themselves are good. On most TVs the amplifier is part of the main board, so this fault and the next one overlap.
Symptoms:
No sound from speakers, headphones work
Very faint sound at maximum volume
Distorted sound at any volume
The fault appeared suddenly, not gradually
How to test it:
This is difficult to test without opening the TV and measuring the amplifier output. If the speakers test good but there’s no sound, the amplifier is the next suspect. On most modern LG TVs the amplifier is integrated into the main board, so the repair is a board replacement.
Cost: $60–$150 (main board replacement, which includes the amplifier on most models).
Repair or Bin? Repair on a TV under five years old. On an older set, external speakers are often the better solution.
7. Failed Main Board
Why it stops the sound: The main board processes the audio signal. If its audio processing fails, no amount of speaker or amplifier testing will fix it — the board has to be replaced.
Symptoms:
No sound on any input, headphones don’t work either
Other functions affected — apps, inputs, or the menu
Error codes or erratic behaviour
The fault followed a power surge or a failed firmware update
How to test it:
This is the diagnosis of elimination. If the settings are correct, the cable is good, the headphone jack is clear, and the speakers test good, the main board is the remaining suspect. Inspect the board for visible damage — burnt components, bulging capacitors, or a burnt smell.
Cost: $60–$150 for the part, plus fitting.
Repair or Bin? Repair on a TV under five years old. On a TV over five years old, weigh the repair against a new set or a soundbar.
8. Firmware Fault
Why it stops the sound: Occasionally a firmware update introduces an audio bug — the TV’s software is fine but the audio processing behaves incorrectly after the update.
Symptoms:
Sound disappeared immediately after a firmware update
Sound works on some apps but not others
Sound comes back after a restart, then disappears again
The fault is intermittent and doesn’t follow a pattern
How to test it:
Check whether the fault started on the same day as a firmware update. Try a factory reset — Settings → All Settings → General → Reset to Initial Settings. If the sound returns after the reset, the fault was the software. If it returns and then disappears again after the next update, contact LG support for a firmware rollback.
Cost: $0.
Repair or Bin? Repair. Free, and it resolves software faults.
9. External Speaker or Soundbar Fault
Why it stops the sound: If you’re using a soundbar or external speakers, the fault may be there, not the TV. The TV is sending audio out, but the external device isn’t playing it.
Symptoms:
No sound from external speakers or a soundbar
Sound works from the TV’s internal speakers but not the soundbar
The soundbar has power but no audio
The fault started after changing the soundbar’s input or settings
How to test it:
Check the soundbar’s input setting matches the TV’s output (HDMI ARC, optical, or Bluetooth). Check the soundbar’s volume is up and it isn’t muted. Test the soundbar with a different source — a phone over Bluetooth, for example. If it plays from another source, the fault is the TV’s output setting or the cable between them. If it doesn’t play from any source, the soundbar has failed.
Cost: $0 to fix a setting. A replacement cable is $5–$20.
Repair or Bin? Repair. Usually a setting or cable.
Repair vs Replace: The 50% Rule
If the repair costs more than 50% of the price of a new equivalent TV, replace it.
Typical repair costs:
Free fixes (mute, audio output, headphone jack, firmware): $0
Cheap fixes (HDMI cable): $5–$20
Medium fixes (replacement speakers): $20–$50
Expensive fixes (main board, including the amplifier on most models): $60–$150
Alternative: external speakers or a soundbar, $50–$150
New TV cost: $300–$1,500 depending on size and model.
When to repair:
The fault is a setting, cable, or headphone jack sensor
TV is under 5 years old with a speaker or main board fault
Repair cost is under half the new TV cost
When to bin:
TV is over 5 years old with a main board fault
Repair cost approaches half the new TV cost
Multiple faults at once
The alternative worth considering: on any TV where the internal audio repair is borderline, a $50–$150 soundbar sidesteps the repair and gives better sound than the TV’s internal speakers ever did. For an older TV with a main board fault, that’s often the smarter spend.
What You Can Safely Do Yourself
Safe DIY repairs:
Check and clear mute and volume
Change the audio output setting to TV speakers
Check the source device’s audio settings
Test and replace the HDMI cable
Try a different HDMI port
Free a stuck headphone jack sensor
Factory reset for a firmware fault
Test and reconfigure a soundbar or external speakers
Technician required:
Internal speaker replacement (requires opening the TV back)
Audio amplifier or main board replacement
Any repair that involves the power supply or panel
FAQ
Why does my LG TV have no sound?
The most common causes are a muted TV, a wrong audio output setting, or a loose HDMI cable. Check these first before assuming a hardware fault.
Why does my LG TV have sound through headphones but not speakers?
This points to a failed internal speaker or a failed audio amplifier. If the headphones work, the audio processing is fine.
Why does my LG TV have no sound on one input only?
This points to a source device or cable issue, not a TV fault. Test the source on another TV to confirm.
Why does my LG TV have no sound after a firmware update?
This is usually a software or setting fault introduced by the update. Check the audio output setting and consider a factory reset or firmware rollback.
Why is my LG TV sound not working but the picture is fine?
The video and audio paths are separate. A cable that carries video but not audio, a wrong audio output setting, or a failed speaker stage will all produce a perfect picture with no sound.
Is it worth repairing an LG TV with no sound?
Usually yes, if the fault is a setting, a speaker, or a headphone jack sensor. If the main board has failed, repair is worth it on a TV under five years old. Otherwise, external speakers are often the better solution.
Where to Go Next
This post has covered every common cause of no sound on an LG TV and the decision framework for repair versus replacement. Depending on your situation, one of these is your next step:
If you’ve worked through the settings, the cable, and the headphone jack and the sound is still missing, the dedicated guide covers the full audio chain in order — input and source testing, cable testing, headphone jack testing, speaker and amplifier testing, and main board diagnosis — with the repair-or-replace threshold for each component.
Get the LG TV Has No Sound guide — $3.95 →
If your TV won’t turn on at all, that’s a different fault — power supply, backlight, or main board rather than the audio chain.
Get the LG TV Not Turning On guide — $3.95 →
If you want the full LG TV fault reference in one place, the LG TV Fault Diagnosis Guide covers every common fault — picture, sound, power, apps, and connectivity.
Get the LG TV Fault Diagnosis Guide — $7.95 →
Related Articles
LG TV Red Light Blinking 3 Times?
Decode the blink pattern and find the fault.
LG TV Remote Not Working?
Fix remote pairing and response problems.
LG TV Keeps Turning Off?
Diagnose why your LG TV shuts down on its own.
LG TV Turns On By Itself?
Diagnose why your LG TV powers on without being asked.
