Asus n550jk electric noise

Aug 6, 2018
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So my 4 year laptop's charger was destroyed by my dog so i had to replace it with replacement ac adapter by asus and bring it to technician and i found out that my battery is also dying so the tech guy told me to just use my laptop without battery but i cannot use it for 3 hours bcause it may damage the other parts. When i got home i noticed a electric noise from the charging port im just concerned that it may blow or burn the motherboard, is it normal? I didnt hear the sound before cause it was loud on the service center. Plus the laptop is grounded i cant touch the keyboard and even the tpad
 
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