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Dangerous Apple Power Adapters?
An anonymous reader writes "Even with all these exploding Dell notebooks and other notebook safety problems, Apple has seemed relatively immune. Every once in a while, some odd thing came along, but it seemed like relatively calm waters. Not anymore — Apple's notebook power adapters appear to be the source of some serious safety concerns. Every iBook and PowerBook user should read this and keep a close eye on their adapter — the adapters suffer from very poor design including wires that seem prone to short out and burn and zero short circuit protection."
Apple had a power adapter safety recall by the Consumer Product Safety Commission back in the G3 era, and a battery recall last year. Is this a new problem?
Anyone that has owned powerbooks or ibooks knows about the crappy power adapters. I have personally lost three, of which only one was covered under warranty. The two biggest weak points:
1. the connector that plugs into the laptop did not have enough ribbing material, so it frayed easily.
2. the thin cable that runs from the laptop into the brick had zero ribbing, it just simply ran into a hole. Frayed easily, I even had one catch fire.
After three Apple laptops I even started noticing how Apple tried to attack these problems. If you look at the last power supply shipped before the magnetic connectors came out, you will see that the "thin" cable is almost twice as thick as the one that shipped with iBook G3s and Titanium Powerbooks. You will also notice much thicker ribbing at both ends of that cable.
The worst of this is that the apple branded adapters were $79 apiece, while a perfectly working replacement, with much sturdier cables, could be had for $35.
Pedro
----
The Insomniac Coder
The details you will need to know are: The gentleman, who complains about the problem, is a bubbeling idiot.
The power rating of these power bricks is 45W (for my iBook). Fourtyfive watts. If you concentrate that amount of electricity in a small volume, it is quite sufficient to set most synthetic materials alight. The possible exception being Teflon.
His comments (yes, I did RTFA) about the brick not having any kind of short circuit protection is groundless. He has experienced one type of SS protection, the type found in many large PC PSUs, which needs a power off to reset. Another type is the foldback, or current limiting SS protection circuit, which increases available power immediately after the short is removed. So it is no wonder that he could sense the power (by repeatedly shorting out the brick?! Asking for trouble, is he?) as soon as no short was present.
He would have a solid argument if he was able to draw an excessive current through the short, larger than, say, the 1.875A (45W @ 24V) the brick is specified for.
I just tried testing for this problem using the brick for my iBook, but failed miserably, since I don't have the proper connector to mate with the low voltage end: The thing won't even power on unless it is plugged into the iBook. This may be a design change since my brick is apparently of a more recent design as compared to the one shown in TFA.
So in summary the actual news items here are:
*) Frayed wire can short out.
*) A short may not be sufficient low ohmic to trip the power limiter in the PSU, yet the power you can draw through it may be sufficient to cause fires. (This is no different than for any other electrical appliance. AKA: Badly maintained electrical installations can kill you.)
*) Apple didn't employ sufficient strain relief at the point, where the power wire leaves the power brick.
Move along, nothing to see here.
Apple Authorized Service Provider. hey, that's me :) Certified to work on everything apple sells, warranty repair.
I have yet to see a single pack catch fire. And I've replaced quite a few of them. Damaged, yes. They definitely need to improve their strain reliefs, and magsafe is brilliant. But defective by design? Not from a safety perspective. They DO need to improve the strain reliefs though.
If one tire in 20,000 started to bulge on the sidewall after 30,000 miles, and the owner didn't notice it until 2 months later the tire blew, you can't blame that entirely on Goodyear. All products break, and the consumer does have a reasonable responsibility to identify a product that has failed and may create a safety hazard.
Now take the ibook g3 logic board recall. Now those I have seen maybe 4 dozen of. THOSE are defective. But THIS, this is just a blip.
Actually now that we have magsafe, I don't expect this to even happen once in a blue moon. The power cords are 2x as thick, and if you are a total yutz trying to use your macbook 5.95 feet from the wall using a 6.00 foot power cord, POP and out releases the magsafe before you can jack up your cord. Something tells me OP will just glue it in, break another cord, and cry for us some more.
I work for the Department of Redundancy Department.
I work in a lab where we have dozens of these bricks. We lend them out to students all the time, who do god knows what with them. Over the course of several years, we've not had one problem. No shorting out, no signs of wear, nothing. I personally have one as well, going on three years now. I take it with me every day, usually just throwing it in my bag. It looks the same as the day I got it and shows no signs of wear upon serious inspection. Mac users are a VERY VOCAL bunch. It is impossible to gauge the severity of a problem by listening to the Mac community.
Maybe a problem, likely not. Mac users tend to go nuts about manufacturing errors more so than others. Anyway, I got a macbook a couple weeks ago -- has the magsafe connector. I recall not too long ago tons of news about the magsafe burning up at the computer side. I noticed that when I pull the connector straight out from the computer, it stresses the joint where the wire and plug meet. Thing about a magnetic connection is that it is hard to pull the two sides straight apart, but easy to break if attacked from an angle. So now I just push on one side of the connector and it breaks away without difficulty or wire stress.
I know everyone always claims to be gentle on their machines, but when I look at other people's laptops -- I suspect the truth is much rougher. Anyway, don't yank the adapter around by its cord and I bet it'll fine.
What changed under Obama? Nothing Good
This article makes some sense. But when he tries to explain that it should trigger an GFCI (or even AFCI), he gets way off track.
It would never trigger an AFCI, because there's too much smoothing circuitry between the output and the wall plug. No matter, as an AFCI is designed to protect against arcs in the walls and frayed AC power cords. So the AFCI comment didn't make sense.
Also, the GFCI comment doesn't make sense either. A GFCI is supposed to notice power being drawn and not returned on the neutral. The Apple power supplies are designed to be 2-prong devices, so they could never dump significant power on the ground pin and trigger a GFCI. The only way it could trigger a GFCI is if you shorted the live end of the cable to a separate return, like earth ground or a hot tub or whatever. Then the power would not come back on the neutral and would trigger the GFCI.
Anyway, a GFCI is supposed to prevent against things like dropping a live appliance into a puddle of water or whatever, not shorts internal to low voltage cables.
His spark test maybe means something, I see what he is talking about there. But I'm not sure about his testing methodology. Maybe he's testing a case expecting it to shut down and instead Apple just current limits, which is an acceptable alternative. I just can't tell with only the data on that page.
The article summary is definitely full of unwarranted hyperbole. The article isn't even close to triggering a level of "source of some serious safety concerns".
http://lkml.org/lkml/2005/8/20/95