Facing TV Problems? Ask a TV Technician.
OK, does volume bar/level appear on screen when push volume button on TV or its remote?
OK, and you get sound when plug headphone in headphone jack on TV, correct?
I guess you got phone-call offer, please feel free to ignore it.
please knock the rear of TV gently with your palm to see if sound sill stay?
No, since the problem resolved without my answer as we were still troubleshooting it so no charge, please contact customer service for any billing issue.
Thanks and have nice time!