Question about Hitachi 53FDX01B 53" Rear Projection Television
Your sets use CRT technology and the whistling is probably caused by the failure of the high voltage supply which operates at ultrasonic frequencies and normally should not be audible at all.
When the frequency falls to the point of being heard, the circuit is no longer producing the high voltage needed by the CRTs.
Not knowing your sets, I can't say whether the HV supply is separated from the main supply or not but you should be able to determine this by opening the back of the unit and visually tracing wiring and cables from origins to the CRT area. If it is separate, then a call to the US Hitachi customer service should get you the cost of a replacement or repair.
Posted on Feb 15, 2009
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