A television that displays a perfect picture but produces no sound can be frustrating, but this symptom is often easier to diagnose than it appears. In many cases, the issue is related to settings, connections, or software rather than a failed component. At TVpartsToday, we encourage a step by step troubleshooting approach so DIYers can confidently identify whether the problem is external, software based, or tied to an internal board.
Would you rather watch a video? Check out our helpful YouTube video, showcasing a LG main board swap to resolve no audio:
Start With Audio Controls and On Screen Settings
Before diving into hardware, confirm the TV itself is not muted or restricted by a setting. Increase the volume using both the remote and the physical buttons on the TV. Watch for any mute indicators on screen and test audio across different types of content such as live TV, streaming apps, or external players. If sound is missing everywhere, the issue is system wide rather than content specific.
Eliminate External Audio Equipment First
Soundbars, receivers, and Bluetooth speakers are common sources of audio confusion. Make sure any connected audio device is powered on, set to the correct input, and turned up. Disconnect all external audio equipment completely and test the TV using only its internal speakers. If sound returns after removing external gear, the TV is functioning properly and the issue lies with the accessory or its cables.
TVpartsToday Tip: When TV speakers work but external audio does not, replacing TV boards will not fix the problem. Always isolate the TV before assuming internal failure.
Verify the Correct Audio Output Configuration
Modern TVs allow multiple audio routing options, and a mismatched setting can silence the speakers entirely. In the audio menu, confirm the output is set to TV speakers when no external device is in use. If using HDMI ARC or optical audio, verify the selected output matches the connected port. Switching between audio formats such as PCM, Auto, or Bitstream can also restore sound if the TV is struggling to decode a signal.
Rule Out Source and Input Issues
Audio problems can appear isolated when a single app, HDMI device, or input fails. Switch between streaming apps, HDMI ports, and built in tuners if available. If sound works on one source but not another, the TV hardware is likely fine and the problem points to the external device, app, or cable.
Inspect and Swap Cables
Loose or failing cables are a frequent cause of audio loss. Reseat all HDMI and audio cables, then test with a known good cable if possible. Optical cables should be checked for cracks, tight bends, or debris at the connector. HDMI cables can fail in subtle ways, sometimes passing video without audio or the opposite, so replacing the cable is often a quick and inexpensive fix.
Reset Temporary Software Glitches
Power cycling clears many internal errors that affect audio processing. Turn the TV off, unplug it from power, wait at least 30 seconds, then reconnect and turn it back on. This forces the system to reload audio drivers and clear temporary memory conflicts.
Keep the TV Software Up to Date
Firmware issues can interfere with audio decoding, HDMI communication, and app playback. Check the TV’s software update menu and install any available updates while connected to Wi Fi. After updating, restart the TV to ensure the changes take effect.
Factory Reset as a Final Software Step
When all other setup and software steps fail, a factory reset can resolve deeper system conflicts. This will erase saved apps and settings, so it should only be used as a last software level solution. If audio still does not return after a reset, hardware becomes the most likely cause.
When No Sound Points to a Hardware Failure
If your TV consistently shows picture but produces no sound from any source, including internal speakers, an internal board is usually responsible. That board is usually the main board, which we have pictured below as an example:
The main board handles all audio processing, HDMI input communication, and speaker output control. When it begins to fail, sound may disappear entirely while the picture remains unaffected. This is one of the most common board failures associated with no audio complaints.
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The T Con board primarily controls picture timing and does not directly generate sound. While it rarely causes complete audio loss on its own, prior video issues such as flickering, lines, or sync problems can indicate broader signal communication issues between boards. In most no sound cases, however, the main board remains the primary suspect.
TVpartsToday Tip: Always match the exact part number when replacing a main board. Board numbers alone are not enough to guarantee compatibility.
Get the Right Replacement the First Time
TVpartsToday stocks replacement main boards, T Con boards, and other TV repair parts for a wide range of models. Our team can help confirm part numbers and compatibility so you can complete your repair confidently and avoid unnecessary returns.
A TV with picture but no sound does not automatically mean the screen or speakers are bad. With proper troubleshooting and the right replacement part, most audio issues can be resolved efficiently without replacing the entire television.
Need Help?
If you’re still unsure about the issue or need to replace a part, reach out to TVpartsToday. We can help you identify the exact cause of the problem and provide the right replacement part!
Would you rather watch a video? Check out our helpful Troubleshooting 101 playlist over on YouTube!
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