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HP Spectre x360 - Metallic noise when charging

HP Spectre x360 (2016)
Microsoft Windows 10 (64-bit)

Hello

I'm using the new HP Spectre x360 laptop and I'm experiencing an annoying issues. Whenever I connect the charger there is a "metallic" noise from the laptop. In a quiet room there is no problem hearing it. Almost sounds like an old mechanical hard drive but more metallic and high pith. I only hear this when the charger is connected

 

I had the laptop replaced by this but still have the same issues. I have three different original power adapters and I have the same issue with all of them. I have also tried to disable the keyboard baclighting since I read that could cause issues previously.

 

I don't really want to send this one back too since I think that the third laptop will have the same issue. Mst be others noticing this? Any solution, workaround or clue what is causing this?

 

Best regards

Johan

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