Adapter Connector
2011
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How to repair Dell MK911 ac adapter
Your laptop goes dead and you don't understand why because it's plugged in. The very first thing you should look for is status LEDs. The transformer brick or ac power adapter usually has a status led on it to show that it's plugged into a good outlet and is functioning. If the laptop power adapter LED is not lit and the cord is firmly seated in both the transformer and the wall outlet, then the AC adapter is probably bad. But troubleshooting most power problems takes a little more effort. Fortunately, it's also common for the failure to be the power cord itself, as I've noted with some Toshiba models. Many HP and Compaq models use "L" connectors which are less prone to failure, and Sony and Dell cords seem more robust as well, but it's always a possibility. It seems to me I've seen "L" connectors on Dell MK911 ac adapter as well.
If the status LEDs on the laptop blink when you wiggle the power cord or if they can be kept on if you position the cord just right, the failure is either the power cord or the power connector inside the laptop. Of the two, you want the problem to be the power cord because it's much easier to fix. A power cord can look perfectly good (see above) but be broken inside, normally as result of letting it dangle off the back of the laptop when you work on your lap. The length of cable running from the Dell MK911 ac adapter to the laptop is shielded coaxial cable, with the inner conductor attached to the inner part of the barrel connector and the outer part serving as ground. The actual AC power cord is often detachable from the power adapter and is unlikely to fail as long as it's seated.
Many power cords also include a large choke, probably a ferrite, which I assume is to prevent RF interference generated by the laptop from leaking back onto the cord and turning the length between the laptop and the power adapter into an antenna. Frankly, I just cut them off on a repair if they are close too the barrel connector. It's nice to have a reasonable wire stripper so you can strip the coax in one shot rather than worrying away the sheathing with a cheap tool. You want to take about an inch of the outer sheath off and then twist the braid shield together. Some techs like to preload the braid with solder before tacking it to the power connector, but if there's a tab you can wrap it around first it's not really necessary.
I prefer to buy new connectors than to try to reuse the original for several reasons. First, the original ac power adapter for laptop will have a molded casing on the connector, and the only way to get it off is to hack away a little at a time with a razor. I've done it and effected a repair when I was traveling and had no other choice, but the braided conductor on my Dell notebook was soldered directly to the outside of the barrel rather than having its own solder point, like a replacement connector. It's also very difficult to solder factory connectors without melting the insulator unless you have a hot, fine tip iron. I get my replacement connectors at Radio Shack for a buck or so, bring the original for sizing. The inside and outside diameter have to be an exact match, so you might even want to bring your notebook to the store with you.
If you are working with the cord length still attached to the power adapter, make sure you slide the shell for the new connector onto the cord and faced the right way before you solder on the connector. Otherwise, you'll be faced with doing it all over or just taping the heck out of the connector. The length of the barrel connector that fits into the laptop body is somewhat flexible, too long can work, to short and you may be able to back-off a little on the connector shell. To the left, you can see the inner (yellow) of the laptop power cord soldered to the center tab of the barrel conector, and the braid soldered to the outer tab. If you have a heatshrink gun and tubing you can make a much neater job of it than I'm doing here:-)
Obviously, you don't want the two tabs to touch or it just shorts out, so you can work a little tape around one of the tabs if you are paranoid, but leave room to get the shell on. The shell is actually threaded, as is the connector, so they usually hold together pretty good. Since this particular failure gave me so much grief the first time it happened, I always travel with a spare replacement end for my laptop power cord. While my first replacement is still holding up, should it fail, I can just undo the splice and tape the replacement end on in a matter of minutes. It's unfortunate that so many people buy a new laptop power adapter or even crack their laptop open and start fooling with the inside receptacle when the problem is just the connector on the power cord.
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I need help connecting DS to my Verizon FiOS ZyXEL USP Adapter/Connector.?
I ahev been trying to connect using the Wireless USB ZyXEL Thing I got that pulgs into my computer from Verizion FiOS to my DS for Wi-Fi. Each of the connections are sucessfull. Then when I try to connect fully, It is unsucessful. WHY!? How can I connect to WI-Fi? Thanks in advance!
If it is wireless why does it have to plug into the computer?
Old Apple MagSafe Power Cord Fraying? Apple May Replace It (Forbes)
In a note sent to Apple sent to customers this week the Cupertino,
Calif.-based Mac and iPhone maker said it will replace some of the older
toddler-proof 'MagSafe' power cords featured on Apple’s notebooks, or provide
a refund if you've had to replace the cord, even if they're out of warranty.
The problem? Something Apple calls 'strain relief.' That bit of jargon refers
to damage to the power cord, either where the cord meets the connector itself
- the part that hooks the cable to the body of a notebook -- or to the power
adapter that plugs into a wall socket. Apple’s ‘MagSafe’ power cords,
introduced in 2006, pop out of a notebook if they’re tripped over, preventing
the machine from falling to the ground and breaking. The original MagSafe
cords had a ‘t-shaped’ design, with the cord connecting to the middle of the
plug that hooks up with Apple’s notebooks. Newer cords have an ‘l-shaped’
design with the cord connecting to the side of the plug. The new design,
presumably, places less strain on the cord. Apple’s offer stems from a class-
action lawsuit against the company that asserted Apple’s 60 and ...
Air Tool Universal Connector Adapter
