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i am having a similar problem
sorry i have no answers or anythin but i thought i'd empathize.
i have a inovatek in car LCD screen head unit. with the engine off, everything plays great including the screen but when i turn on my engine a very annoying noise is produced out of the rear speaker which are amplified. this sound's frequency is directly proportional to the revolutions of my engine.
i am hoping that if someone can answer your question, the solution may be helpful for my situation.
thank you
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