Comment Its the voltage down-converter on the backlight (Score 1) 236
Apple has long acknowledged this issue. It has been in every laptop they have made. The problem is a capacitor in the voltage down-converter.
Previously the down-converter was in the top of the clamshell, but now it has been moved to the bottom case near the motherboard.
You can hear the same hiss/hum from the ballast in a florescent light. Since the backlight on a LCD is really just a thin florescent light.
If the issue is exceptionally bad, and easily reproducible you can send the machine into the depot for repair, worst case scenario you will not have your machine for up to 7 days.
Previously the down-converter was in the top of the clamshell, but now it has been moved to the bottom case near the motherboard.
You can hear the same hiss/hum from the ballast in a florescent light. Since the backlight on a LCD is really just a thin florescent light.
If the issue is exceptionally bad, and easily reproducible you can send the machine into the depot for repair, worst case scenario you will not have your machine for up to 7 days.
