Noise coming from Macbook Charger when Scrolling??

[Simber]

Hey guys, after just getting my macbook fixed from staingate, I've noticed a new problem: when it is being charged from a power adapter, there is a static noise coming from the charger when im scrolling using the two fingers (im sitting at my desk and i can hear it in a quiet room, verrry noticeable when i put my ear on to it). When the macbook is unplugged and powered by battery, there is no noise.

Cause for concern? should i avoid using the charger? would this be replaced under warranty?

Regards, Simon

 

[RoboWarriorSr]

Hey guys, after just getting my macbook fixed from staingate, I've noticed a new problem: when it is being charged from a power adapter, there is a static noise coming from the charger when im scrolling using the two fingers (im sitting at my desk and i can hear it in a quiet room, verrry noticeable when i put my ear on to it). When the macbook is unplugged and powered by battery, there is no noise.

Cause for concern? should i avoid using the charger? would this be replaced under warranty?

Regards, Simon

was the charger grounded properly?

 

[Simber]

What do you mean by grounded?

 

[Simber]

was the charger grounded properly?

So I've tried grounding it, and there is still noise coming from it.

Sometimes is disappears, but when the noise returns, it is louder when i scroll or do anything that requires the computer to compute something (e.g. close a tab on google chrome)

I've run a diagnostic test at the startup by pressing D, and said there were no problems...

 

[RoboWarriorSr]

So I've tried grounding it, and there is still noise coming from it.

Sometimes is disappears, but when the noise returns, it is louder when i scroll or do anything that requires the computer to compute something (e.g. close a tab on google chrome)

I've run a diagnostic test at the startup by pressing D, and said there were no problems...

I know when I used Parallel and the charger wasn't grounded I could hear static noise, all disappeared once I used the longer adaptor but could it be the wiring in the building you're in? That's the only reason that I could think of. Before stopping by an Apple Store if one is nearby, try using the machine plugged in another building and see if that fixes it. If it doesn't I would stop by an Apple Store and ask them about it.

 

[Gav2k]

Just a note.

The charger is only 'grounded' when using the extension cable. It's not grounded when using the duck head.

This is likely just capacitor noise, which occurs with slight heat-generated vibration between the components of capacitors and circuit boards that are subjected to ac. Since ac switches direction at about 60Hz, you may hear a buzzing sound at about this frequency.