In the TV's 'Sound' menu there is an entry for 'TV speakers'. Try setting it to 'on' and if the GT3.0 HDMI output has audio on it you should now get it from the TV speakers.
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2015 Rockwood Signature UltraLite 8282WS Platinum, GY Marathon LRD, TST 507RV TPMS
2005 GMC 2500HD CCSB D/A, Curt E16, Prodigy P2, Garmin RV760LMT w/BC-20 b/u cam
Self restraint is for the young. I'm old and want it NOW!
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