I bought a new JVC television Model AV32R25EKS. It is just over 18 months old but all of a sudden as I turned the TV on all speakers started to omit a very loud noise similar to a pneumatic drill. The picture is fine but the noise is tremendous and cannot be turned down with the volume control. The sound is a very very loud buzz with a very rapid pulseing noise. Can you please help in any way prior to me calling a TV engineer out so at least I have an idea of what has gone wrong. Thankyou!

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