Unless you are an electronics engineer, it is unlikely you can fix. Look on the back for a fuse holder. If there is check it with a multimeter. It may be protecting the audio parts. Make sure you don't have a button press for a different audio source than what you think and also check if you have switchable speaker outputs. Finally make sure the speakers are connected and the dog hasn't pulled them out.
Service Manual
https://www.audioservicemanuals.com/j/jvc/jvc-rx/261782-jvc-rx-817-vtn-service-manual
Strangely there are far more Service Manuals and no Owner Manual!!
https://www.google.com/search?q=JVC+RX+817+owner+manual
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