HD Update

sharp aquos LC-42XD1EA mounted on wall bracket, TV makes high pitch noise?

have a sharp aquos 1050 HD ready LC-42XD1EA mounted on wall bracket, TV makes high pitch noise, which can be heard over the volume. when you mute the volume i can still hear the noise. i have tried disconnecting everything and powering everything on that electric run off and still the noise accurs. have disconnected everything electric on the ground floor of house where tv is and still the high pitch noise is there.. what could it be??
its still under garuntee and had 2 engineers look at it and both said its operational noise but its so loud and annoying

in the powersupply -transformer, coils and chock
can go faulty and make high pitch noise.if it’s
under gaurante call engineer.

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