It is a bad power supply for the backlight. That is the only section capable of such a noise. Good luck i hope this helps. I know i have heard similar sound from a laptop with similar issues! Prodzilla
Thanks for the info I'll look into it soon.
This problems ur tv it is having,it could be only causes by two sources one a bad or dead incomming broadcasting signal wire that plug into the tv Tuner signal board.Take out the incomming signal wire if u have a loud blank static noise picture on the lcd screen for a picture,than it is the incomming broadcasting signal cable wire,that u call the cable company for the replacement of the wire.The other are the 1 or 2 long LCD inverter boards are dead,not giving the LCD screen panel a help to produced a backlight for a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those 1 or 2 refurbishes long LCD inverter boards for the replacement.Not the tv power supply board problem,because u have power and statics noises came out of the tv speakers,mean tv have power and power board is good.
do you have any audio-try hitting input button after unit is on and hissing.
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