A little late commenting, however:  If the power supply is external - replace it. I had a 10" monitor that ran from a 12 VDC wallwart - it was very noisy. Shut the monitor off and it was quiet. So, I brought power to it from my main 12 VDC line and the noise was gone. &^*%$ cheap wallwarts!! Good luck!!!

Bill W2BLC

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