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Replaced DC jack on Dell laptop - now AC adpter not recognized


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#1 AlinNYC

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Posted 21 December 2010 - 01:48 PM

I have a Dell Inspiron 9200 laptop running Windows XP SP2. I recently suffered a broken DC jack, which eventually caused the computer to stop powering up. I have now replaced the DC jack and the laptop runs OK on plug in power. But I get the "AC adapter not recognized" error message at start up, and so battery won't charge and I believe system isn't running at full speed. AC adapter is shown in BIOS (updated to version 001) as "unknown." The AC adapter I'm using is a very new Dell OEM, bought from them when the power problem first appeared. Battery is reasonably new and was charging OK before the DC jack problem. Dell has no answers. Is there anything I can do here, or am I doomed to using a slow computer on AC power only?

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#2 MrBruce1959

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Posted 21 December 2010 - 01:56 PM

Interesting that Dell has no answers when it is their equipment and their adapter that you have hooked up to the laptop. :whistle:

Do you still have the original power adapter that came with the laptop and does it still work?

Does the original plug fit the new power jack?

Bruce.
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#3 AlinNYC

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Posted 21 December 2010 - 02:56 PM

Yes, I still have the original adapter. It fits but it doesn't work, with either the old or new jacks. But now I think the reason it stopped working is that I bent the center pin while fiddling around with the old broken jack trying to make it work.

#4 MrBruce1959

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Posted 21 December 2010 - 03:35 PM

Okay, to get past this hardware I.D. issue.
I believe laptop adapters have hardware I.D.s built into them to which the laptop's chipset looks for.

This suggestion will make one adapter useless while saving the original.

This will involve cutting the wire off of the new adapter and cutting the damaged plug off of the original adapter.

This will also increase the length of the wire if you cut the wire on the new adapter as close to the power supply as possible.

You have to make sure you correctly match the wires!!! Failure to observe the correct wire to wire will cause reverse polarity and can damage your laptop!

Shielded wire goes to shielded wire.

Red to red

Black to black.

Any other color goes to matching color.

If for any reason, one wire has a wire color code that does not match the color code of the other, please post back here and let me know.

I suggest when you connect the wires together it is best done by putting shrink tubing on the wires and then tinning and soldering the wires together.
Then lightly heat the shrink tubing so it shrinks to conform to the wiring.

This is better than twisting the wires together and using electrical tape, which to me, this is less secure and looks quite awful in appearance.

What you will have now is the original adapter with its original hardware I.D.
A longer wire than before.
A new un-damaged plug at the end of the wire.

Most of the supplies I mentioned above can be found at any Radio Shack store.

Those supplies are listed below:

Solder

Soldering iron.

Shrink tubing for electrical wiring.

Hope this helps solve your problem.

Any questions or concerns please feel free to ask before continuing with my suggestion.

Please be advised, this procedure will void any warranties you had on your newer adapter and can no longer be returned for repair or refund.

Proceed at your own risk.

Please be sure your original adapter is in fact supplying power before you cut any wires, this can be done by checking the plug end with a VOM multi-meter set to DC volts. If the meter reads any voltage above 12 volts DC, the original adapter is still good and what I suggested above will work.

Please keep me updated.

Bruce.
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#5 AlinNYC

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Posted 21 December 2010 - 04:11 PM

Thank you so much for that quick and detailed reply. I would think that Dell's pricey replacement adapter should have the proper chipset in it to mate with the computer it's ostensibly for, but your possible solution sounds like a possible win-win workaround, so I'll give it a try. I have some of the materials here, but it will take me some time to get the other parts together given my busy holiday travel schedule. I'll get the stuff together and perform the repair as soon as possible and return here to report, although it may take a few days.

#6 MrBruce1959

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Posted 23 December 2010 - 01:56 AM

Okay and thanks for the update.

I'll watch this thread for your next post.

If you have any problems or questions, please feel free to ask. :wink:

Bruce.
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