ACD LED charging Macbook Pro = Audio hissing (loud)

[shiny-blanket]

Help,

Recently purchased a 24" Cinema display along with a 15" macbook pro. The screen has yellow fringing on the edges (apparent on the discolored menu bar) and some dust under the glass.
I can live with this, however I've just noticed when the macbook is charging from the display it causes a really loud electrical hissing sound from the speakers. Remove the charger and it's fine.

Has this been reported as a widespread problem, or is it local to my display?

 

[jlpoore89]

Help,

Recently purchased a 24" Cinema display along with a 15" macbook pro. The screen has yellow fringing on the edges (apparent on the discolored menu bar) and some dust under the glass.
I can live with this, however I've just noticed when the macbook is charging from the display it causes a really loud electrical hissing sound from the speakers. Remove the charger and it's fine.

Has this been reported as a widespread problem, or is it local to my display?

First off I am really sorry for your discoloration and dust. I managed to get what seems to be a perfect LED ACD.

But anyways is this hissing coming out of the laptop, display, or external speakers???

On my old MBP if I had something like a printer plugged into a USB port a hissing noise would come out of my external speakers if they were turned up loud with nothing playing. It was just the ground current being amplified by the external speakers.

I do not seem to have this problem using mine in lid closed mode with external speakers plugged in.

 

[shiny-blanket]

It's definitely the speakers. Pressing my palm onto the unibody makes the frequency change. Could it be a shielding issue or something wrong with the display?

I've just removed the ACD charger and plugged in the portable charger and there's no hissing.

Just got a shock from removing the charger

Won't be plugging that back in.

 

[jlpoore89]

Yeah that's not normal. A little hissing is normal due to shielding and grounding, but a loud hiss and shock is not normal at all!!! And if it doesn't happen with your regular charger plugged in then it is definitely a problem with the display. And for $900 it sure as hell shouldn't attempt to electrocute you. If your within your 14 days exchanging should be a breeze if not it still shouldn't be hard because it shocked you and its a liability to Apple.

So I would definitely contact Apple whether it be a store or AppleCare immediately,

 

[Mactagonist]

Why would you be willing to live with any problem in your brand new product? Be it discoloration, dust in the screen or hissing, take it back.