Usually noises that are heard even while the TV is in the off state are power supply issues. Something is off frequency or a coil/tranformer is vibrating at a high rate. The part number for the power board is 263973 but the board is no longer available. If the power supply is going off frequency the voltages will change and possibly cause the set to loose its picture. If its just a mechanical vibration then picture loss could be because a failing lamp.
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