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[jhnnlasnts]

This might be strange, but have you ever listened to the sound of your phone's original power adapter? Mine has a faint sound when plugged in, is it normal?

 

[FreeAllYouCan-OFFICIAL]

adapter doesnt make a sound.

 

[Shinsuke Nishizono]

Obviously it does. If you listen closely to your power brick, you will get sound like you did.

Even i using a Oppo Power Brick, same sound.

Eventually when you disconnect the phone from charging, it stops from fainting sound.