Thunderbolt Display Hum from USB ports

A number of people on a number of threads have reported strange sounds (hum, hiss, crackle) coming from their Thunderbolt monitors. Some reflect electrical interference from other appliances. Some are the result of defects in the Thunderbolt firmware that has allegedly been fixed. A lot of the problems seem to be connected to the speakers. My problem has nothing to do with the speakers, but with a quite pronounced hum (nothing subtle -- you can hear it ten feet away) that arises unpredictably, and can be changed or even temporarily elminated by changing the screen angle. To me it sounded like what in other contexts would be a "ground hum," and perhaps that's what it is, I don't know. What I do know is that, if you have this particular problem, you can solve it by removing all USB devices from the ports on the back of the monitor. These work as ports, but they do produce the hum, at least on mine, regardless of what you plug into them.
There's really no excuse for this kind of thing, but lets face it, Apple products can sometimes be surprisingly shoddy.

See: Thunderbolt Display Firmware 1.2 broke the USB inside the display.
No solution yet. I have a call in w/ Apple Support later today. I recommend you all start calling them.
Symptoms are: TBD connected, Mac goes to sleep or hibernate...when it wakes, USB (including Audio) is inoperative. Unplug/plug TBD back into Mac, item restores.
SMC and PRAM resets do not work permanently...restarting Mac (whether MacBook, Mac Mini or MB Air) doesn't work permanently.
The audio card in the TB Display is a USB device. If you look in your system report you'll see that it's connected.
Here's another thing you can try...Start FaceTime...You'll notice your FaceTime camera doesn't work (in the display) either. It's USB also.
I would strike a guess that the USB driver got borked on the firmware update.

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You can do this. Please use this link
[http://www.google.co.in/search?hl=en&client=firefox-a&rls=org.mozilla%3Aen-US%3Aofficial&hs=uHu&q=java+read+data+from+usb+port&btnG=Search&meta=&aq=f&oq=]
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ReadySHARE USB Hard drive access issue from a Mac Computer (Time Machine or iTunes not working properly)
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http://kb.netgear.com/app/answers/detail/a_id/22763/~/readyshare-usb-hard-drive- access-issue-from-a-mac-computer-%28time-machine-or
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Solved!
Go to Solution.

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Message Edited by BMCit on 01-28-2009 01:56 PM

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