Question about Dell Latitude C640 Notebook

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Dell c640 battery problem

Hello,
I have a dell c640. Just replaced battery and when I have it plugged into the laptop, and plug charging cord in, the charging indicator flashes orange twice rapidly then green. it cycles like this until I unplug it. then when I return the plug it is a solid green. What does this mean? Also, it does not charge when the laptop is powered down. The laptop only appears to be charging when it is powered up.

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  • skeebaone Dec 18, 2007

    THE BATTERY SEEMS TO CHARGE UP WHEN THE LAPTOP IS POWERED ON, BUT NOT WHEN SHUT DOWN.

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  • 88 Answers

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.

Posted on Dec 18, 2007

  • Grant Cameron
    Grant Cameron Dec 19, 2007

    to say the least - that is strange. try upgrading to the latest bios via dell for the d640 and see if that helps. other than that- I don't really know without diagnosing it in person and trying different things in person.

  • Grant Cameron
    Grant Cameron Dec 24, 2007

    my battery just started doing the same thing- looks like it's yet another crapped out battery due to an internal counter IN the battery- you get about 200 charge cycles and then it STOPS WORKING. Thanks for nothing Dell. The batteries are fine- but the charge circuit stops letting it charge or drain the battery- you're screwed- look for a new one- used ones can go at any time it seems...Another great marketing ploy to increase their consumables profits.

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2 Answers

My daughters power supply for her C640 has a pinch


I suggest you DONT USE PINCH POWER CORD FOR SAFETY.

PLEASE TELL ME IS YOUR POWER CORD & THE PINCHED CORD ARE SAME? I MEAN SAME MODEL? AFTER PLUGING OF YOUR CORD, THE BATTERY CHARGING LIGHTS ITS ON? IF NO THEN I GUESS THAT CABLE NOT SUPPORT HER LAPTOP.
VISIT A DELL SERVICE CENTER OR A SHOWROOM AND BUY NEW CORD WHICH IS MADE FOR YOUR DAUGHTER LAPTOP MODEL.
OTHER WISE SOME CHANCES OF SHORTCIRCUIT ON MOTHERBOARD.

Thanks, i am waiting for your feed back & if you satisfied then thumps me please.

Jan 31, 2010 | 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

3 Answers

Dell c640 not charging battery


I have found a few things with this model, first if the laptop works on ac power when the battery is out then try pushing the button on the battery itself and see how many lights light up. If they are not green replace the battery it just wore out. Second if you can wiggle the power cord and you see the charge light flash on and off then the solder joints are cracked on the main board and you will have to take the main board out of the case and drill out the 3 rivets on the metal bracket covering the plug and bend it out of the way then there are a small brown and a small black block near the plug resolder the ends of these facing the plug. bend the bracket back into place and epoxy it where it was. put the main board back in the case hook all the stuff back up and now it will charge your battery. If you are not good at this stuff I would not try it yourself. I have fixed 2 c640s this way and it is slow careful work.

Jun 24, 2008 | Dell Latitude C640 Notebook

2 Answers

Latitude c640


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

Jan 19, 2008 | Dell Latitude C640 Notebook

1 Answer

Power & Battery in a Dell Latitude C640


If the laptop does not run plugged into AC power, then you may have a defective power brick or a power problem with the laptop.

I would try another power brick. If that doesnt do it then your power jack inside the machine may be damaged and usually that means the motherboard is cracked. The only fix in that case is a new motherboard ($150-$200 plus labor) OR you can get the Dell C PORT II port replicator which has its own power jack.

Hope this helps!

Dec 28, 2007 | Dell Latitude C640 Notebook

1 Answer

No power


check your power supply and make sure the proper power at the ends and the light is on the power supply, I no those C640 s have a problem with the darn plug in and the pins in the laptop may have got bend or broken check that out and if all the pins are not bent. your power supply may be bad check that out, if so you can go to Dellsupport.com and order one for fairly cheap. I think that will fix your problem.

Dec 21, 2007 | Dell Latitude C640 Notebook

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