Question about Dell Latitude C640 Notebook

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Latitude c640 hello i have a dell and it will work on the battery and not the plug in so it wont charge

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It could be either the dc power jack where the ac adapter plugs in or the ac adapter itself.
a local computer shop can test the adapter and the computer.

Posted on Feb 17, 2008


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This sounds like a voltage regulator problem. You should have it serviced. If it is under warrenty contact dell, and if not any major computer shop should be able to assist you. Sometimes they can get the replacement parts and service this in store, but more often they will ship it out to have it serviced if it is at all possible. This is not a problem you can solve yourself without a significant amount of know how in laptop repairs. Please rate this solution below, as to how nobody has yet to do so for any of my solutions. Good Luck

Posted on Jan 19, 2008


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Posted on Jan 02, 2017

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Related Questions:

1 Answer

No AC, battery only, works in Dock

Try using the A/C adapter without the battery connected and see if your unit boots.
If it does, you will need a new battery, if it does not, question: do you see the led light up when you plug in the charger adapter ?
If you do not, you may need another charger.

Nov 24, 2009 | Dell Latitude C640 Notebook

1 Answer

My latitude c640 batter do not charge green and yellow light flash when ac plug in

The flashing LED is indicative of a failed battery. The battery for a protable system has a expected lifespan of 300 to 500 discharge recharge cycles, then will eventually fail. If you haven't replaced the battery that is the next step. If the battery has been replaced with a NEW battery and still doesn't charge, then the motherboard would need replacement.

Nov 03, 2009 | Dell Latitude C640 Notebook

1 Answer

New battery and still won't charge.

first, check that the battery connection isn't blocked by a sticker or something.
second: try disconnecting the battery and ac and hold the power button for 1 minute. then give the battery and ac another try.

let us know how it goes.

if it still doesn't work, time for a warranty replacement.

Jun 30, 2009 | Dell Latitude C640 Notebook

1 Answer

Dell latitude C640 laptop battery will not charge. Got a new?? battery but it won't charge either. I am able to run on A/C power just fine.. When I got the computer (used) the battery worked fine... what...

Try taking out battery and plug in power. If it works, battery is faulty. If not,
Try taking out your hard disk plug in power, if it works, hard disk is faulty. If not,
Try taking out memory card, if there's a sound, memory card faulty. If no sound, it's your motherboard that is causing the error.

Note: If machine is under warranty no need to pay for the repairs.

Jun 08, 2009 | Dell Latitude C640 Notebook

1 Answer

Dell Latitude C540/C640

I think you are wasting a lot of effort, I know how you feel and sometimes you cannot win.
Junk it for parts.

I do volunteer work for Technical Aid For the Disabled (a charity organisation) and repair/refurbish laptops and computers for disabled people and I hate to see good computers go to waste.

Nov 14, 2008 | Dell Latitude C640 Notebook

1 Answer

Dell c640 battery problem

This sounds like it is not getting enough amperage from the power brick- check which model power brick you have. I'm not 100% sure but the pa-6 family may not provide enough power to charge and run the laptop at the same time. the PA-9 should- if it's rated at 4.51 @20v - that works out to about 90watt. If you DO have a 90 watt power adapter and it's still giving the orange then red flashes- and will not charge when the laptop is off- you probably have either a bad battery, or the motherboard is faulty and has a bad charge circuit, or a loose power jack. What does pressing the little button next to the charge indicator on the battery do? Flashing every other led- 1,3,5 is BAD, so is 1 and 5. You also might have a 3rd party refurb- that had the guts torn out and is not properly "seen" by the laptop.

Dec 16, 2007 | Dell Latitude C640 Notebook

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