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Return it this tv have intermittent problems with it tv Tuner signal board.That the board,where the incomming broadcasting signal cable plug into it.U should able just pick one option Mono or Stereo sorround sound on Audio Setting setting selection surround sound ON.
looks like ur screen is gone........or any other electrical problems are there.......call a service center and let it check out,,,,,,,a new screen is nearly $1000 so may a better idea to get a new tv if this is the cause
our brand new Vizio 32 HDTV has poor sound quality, so irritating in it's flat muffled character that I can't watch it. My electrical engineer husband as attempted to change it (he does not hear the difference between the Vizio and our two Sony...there is a BIG difference) by turning off the surround sound. But to me nothing has changed. What do you think? it sounds a little bit like an old radio or a broadcast from inside a closet. Hmmm
If the hissing noise is from the LCD, it could be from the power supply due to failing capacitors. This noise is generated when the TV is trying to compensate for the lack of voltage/curent requirements.
Unfortunately, we have the same problem. We hear popping and our sound goes lower. It is not the cable box for us, it's definitely the TV; however, it happens, on our set, after its been on for a few minutes and then goes away after half an hour or so -- however, this evening its been happening for the past hour and the TV has been on for the evening.