When it comes to sensitive electronics like your computer, tablet, recording equipment, etc, the ground wire protects the device from being fried in the event of a power surge or heavy static electricity buildup.
This could be from liquid getting into it, a loose wire, a broken switch or circuit board, or any number of other things. Here's why: the ground wire on any laptop's power supply serves two important functions:įirst, as in all grounded appliances, it prevents you from being shocked, burned, or electrocuted in the event of an internal fault. While many people claim they can fix things without doing this I've seen the damage by not doing it, as it can cause damage that overtime can cause the device to fail. If you do open your system to add more RAM or swap-out your HD (or do any other service internally) then you should follow good ESD protection practices. Also using a grounded cord Vs the two prong fold down option on the brick makes no difference as well (except maybe some EMI emission). The scoop on ESD is as long as you don't open your system to replace the RAM or HD your laptop is not at any more at risk being plugged in or running off the internal battery. In fact the current buzz on the bad 3rd party iPhone chargers in China and elsewhere is likely do to a bad connection inside the charger! In any case you wouldn't want a direct path to ground as you could then be at risk of electrical shock. So there is no direct connection to Ground. Within the brick and feeding into the system via the MagSafe connector the laptop power feed is isolated via a transformer and filter circuitry. So you had either one connection grounded and the other not! How confusing!įYI - In other countries you may not have this as an option as local electrical codes may dictate a grounded plug is needed in all cases. Yet, you could snap off the cord and place the supplied two prong foldable plug unit onto the brick (here in North America). Early systems had just a two prong cord (here in North America). Apple sells your MacBook, MacBook Pro & MacBook Air with a grounded power cord.
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