Start with the simple checks: confirm the television is not muted, raise the volume gradually, and make sure the correct input is selected. Test a different channel or streaming app to see whether the problem affects every source. If only one device is silent, check that device's volume and audio settings before changing the television.
Look at the audio output setting. A television may be set to send sound through a soundbar, receiver, headphones, or another output rather than its built-in speakers. If you use HDMI ARC or eARC, confirm that the compatible ports are connected and that audio return is enabled where required. Reseat cables and inspect connectors for visible damage.
Restart the television and connected audio equipment by following their normal shutdown instructions, then test again. Review recent changes, such as a new cable, software update, or altered sound format. If external speakers work but internal speakers do not, or the issue persists across all sources, consult the manufacturer's troubleshooting guidance before performing a factory reset. Write down customized settings first, since a reset may erase them.