Annoying buzz!!!
be certain its not your cable providing the noise by being ungrounded .or interference from some other device connected or around tv.
disconnect everything except the cable.
turn off all dimmer lighting around tv. try now.
are you using a cable box, if so bypass ,plug cable directly into tv.
try sound again.
then remove cable and plug in dvd or vcr. and try audio now.
if it continues no matter,
its a warranty repair or just use external speakers ,cable boxes can control the audio to ext speakers.
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