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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