No Sund

1. Make sure the MUTE function has not been activated.
2. Try turning up the volume level.
3. Check that there are no headphones connected.
4. Try setting the Audio/Video (A/V) receiver to a different Surround Sound mode. IMPORTANT: Verify that the source you are playing is encoded with Surround Sound audio. If not, the audio will be very difficult to hear using a Surround Sound setting.
5. Set Surround Sound to OFF when playing a source that is not encoded with a Surround Sound signal. Check each speaker to make sure they are properly connected to the A/V receiver. Perform a Test Tone function to verify if the speakers are working correctly. Verify all external audio sources are securely connected to the appropriate inputs on the A/V receiver. NOTE: If the audio is being sent from a television to the A/V receiver, then it may be necessary to disable the internal speakers of the TV or set the audio output of the TV to FIXED or VARIABLE. If the audio output of the TV is set to VARIABLE, then you will need to increase the volume level of the TV. Make sure the correct audio input is selected on the A/V receiver. Confirm what type of HDMI® devices are connected to the A/V receiver and then check the following: Test each one of the HDMI inputs on the A/V receiver to confirm that all of the inputs for the A/V receiver are working. Try a couple of different HDMI cables to verify there is not a bad set of cables. Unplug the video source from the A/V receiver and connect the source directly to the television. If there is still a problem with the audio, continue to the next step. If connecting the source to the TV corrects the sound issue, service will be needed on the A/V receiver. Verify the DEMO (demonstration) mode is not active. Change the ATT (attenuate) setting. NOTE: The procedure to change the ATT feature varies by model. Reset the A/V receiver back to factory specifications. The troubleshooting steps listed above should resolve your issue. If you have completed all of the steps and the issue is not resolved, service may be required. For VAIO Computer products: Please call 1-888-4SONYPC (476-6972) for service information for your product. To check the status of your VAIO product repair, have your phone number or Best Buy service number available and call 1-800-433-5778. For all other Sony products: To send your product to a Sony facility to be repaired or to check the status of a repair, visit our eService web site. You can also drop your product off at one of our Store locations to have it repaired.

Go here for more
https://us.en.kb.sony.com/app/answers/detail/a_id/38388/c/65,66/p/41901,41902,42559/

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Hope that is helpful.
Kervz at www.satechhelp.co.za