Laptop making noise when power cord plugged in

[movo]

Writing this question here because the original "Laptop making noise when power cord plugged in" has been closed. With 27000 views and no solution, seems a bit nonchalant to close right?

My laptop sometimes makes a 'beep-beep' or 'tick-tick' rhythmic noise. Sounds like static. It starts off slow then gets louder and faster. Lately it's been less rhythmic, less silence between the noise, and more continuous, like a bee buzzing. I've narrowed it down to using Sound and the Charger at the same time:

Example 1

- Play a movie with the sound up and power cord connected -> Static noise starts gradually then gets louder and faster.

- Play a movie with sound up and NO power cord -> no Static sound.

Example 2

- Browse to a site with embedded video ad. Ad plays on mute automatically (i.e. NO sound is coming out of the speakers), power cord connected -> Static noise starts gradually then gets louder and faster.

- Browse to a site with embedded video ad and NO power cord -> no Static sound.

Example 3

- Open instant messaging tool of your choice (e.g. MS Teams), new message received with sound notification on, power cord connected -> Static sound starts loud and fast, and gradually gets softer and further apart until it stops.

- Open instant messaging tool of your choice, new message received with sound notification on, power cord NOT connected -> No Static sound

Example 4

- Open Android emulator, power cord connected -> No Static sound

- Open camera app on emulator (no sound coming from speakers), power cord connected -> Static noise starts after few minutes.

Tried disabling the Bang & Olufsen features, cleaning out junk from drives, deep cleaning registry, resetting and eventually new Windows installation with latest drivers. Nothing's helped. Definitely a manufacturer's fault on the hardware.

[sandytechy20]

@movo

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