When I have a USB cord plugged into the power board, I hear a high pitched noise and then when I remove the cord, the sound stops. No one else hears this.
How to troubleshoot a power adapter or transformer that is making a loud humming or buzzing sound. | Sony USA
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![laptop - Power supply makes high frequency noise, is it damaging my battery? (or other parts of the computer) - Super User laptop - Power supply makes high frequency noise, is it damaging my battery? (or other parts of the computer) - Super User](https://i.stack.imgur.com/moQwP.jpg)
laptop - Power supply makes high frequency noise, is it damaging my battery? (or other parts of the computer) - Super User
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