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Based on what you have tried if a buzz or loud static via the speakers you have something wrong in the audio output circuit of the set--problem here is that circuit may be part of the Main board that processes all signal---a look inside---following the speaker leads back would lead you to that board.
A simple thing to do to narrow it a little (you may have done this) is with sound all the way off put your ear to the internal speaker--hear anything at all like a deep hum?
Depending on age of set and cost of the board likely bad it may or may not be a do it yourself repair.
my hitachi 55ex15k will come on and work for a while then the screen goes really bright and some lines come through the entire picture then it shut off
sounds like you have a gun or picture tube shorting. check the bottom of the tubes when you turn it on and see it one of them is lit up more then the other two if you find that then unplug the circut board thats pluged into the tube and turn on the tv again and see if you problem goes away minus that color.
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