1. HDMI Connection: Make sure that the HDMI cable is securely connected to both the Blu-ray player and the HDTV. Ensure that it is inserted properly and make sure that you are not using a faulty or damaged HDMI cable.
2. Audio Settings: Check the audio settings on both your Blu-ray player and HDTV. Ensure that the audio output on the Blu-ray player is set to HDMI and the audio input on the HDTV is also set to HDMI.
3. Receiver or Soundbar: If you have a receiver or soundbar connected to your HDTV, ensure it is turned on and correctly configured. Make sure the correct input is selected on both your receiver or soundbar, and that the receiver and TV are properly connected.
4. Audio Format: Some Blu-rays may have different audio formats, such as Dolby Digital, DTS, or PCM. Some TVs may not be compatible with all audio formats. Check the audio format of the Blu-ray disc you're playing and make sure that your TV is compatible with that format.
5. Output Settings: Ensure that the Blu-ray player's audio output is set to the correct speaker configuration (i.e., stereo, 5.1 surround, etc.). If your Blu-ray player is connected to a receiver, make sure that the receiver's settings match those of the player.
6. Device Compatibility: Some TVs and Blu-ray players may have compatibility issues. Check the specifications of your Blu-ray player and HDTV to confirm compatibility.
If you have tried all of these suggestions and still do not have any sound, you may want to consult the user manuals of your Blu-ray player and HDTV for additional information. You may also consider contacting the manufacturer's customer support for further assistance.