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.
Try raising the backlight setting to high
I also had a severe hum or buzz that was NOT a ground fault loop issue or any other such problem.
Hummed to the point that reading in the family room was annoying !
I took my amp to a Very Qualified shop and the technician simply insulated the transformer 40.00 usd
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Audio failed with a loud buzz, may be capacitor failure. TV about 3 years old.
Just brought the new tv home and connected it last night. Did not notice any noise at all until this morning. It quits buzzing when the speakers are muted, and is louder as the volume is turned up. I will try to troubleshoot when I get home from work. Thanks for the advice.
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