Question noising display when laptop charge

Nov 9, 2020
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i was given old monitor (samsung b1930n) for my second monitor with my laptops (acer e5-476g). it works fine until i charge the laptop and then my external monitor makes noising display.
when i unplugged the laptop charger, that noising display disappear (and i dont hear any humming noise sound)

pls help
 
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