Quantcast Latitude D620 extremely slow when charging

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  1. #1
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    Default Latitude D620 extremely slow when charging

    I just discovered the reason why my laptop has been unbearably slow is because it is charging.

    When I unplug the charger, the laptop returns to normal speed. Does anyone know the reason why this is occurring and if it can be fixed?

    Also, I don't think the laptop is actually charging

    In the task manager I see the CPU usage at around 20% when its not plugged in, and the moment I plug it in, it goes to 100%, then I unplug it and it instantly goes back to 20%.
    Last edited by jshaw; 9th December 2009 at 08:23 PM.

  2. #2
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    Default Re: Latitude D620 extremely slow when charging

    I bet you've got this dreaded "unrecognized AC adapter" problem. The computer can't detect the type of adapter you're using, and throttles everything down such that it doesn't overload some cheap third-party thing it thinks you might be using. When you pull out the adapter, it switches to battery power, and since it thinks the battery is good, it'll run at full speed again.

    Check in BIOS to see if your AC adapter is recognized.
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    Default Re: Latitude D620 extremely slow when charging

    that sounds like it, sometimes an error from QuickSet pops up saying AC adapter cannot be determined...

    How would I fix this?

    btw I tried my friend's charger, I have the same problem using a different charger.
    Last edited by jshaw; 9th December 2009 at 10:50 PM.

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    Default Re: Latitude D620 extremely slow when charging

    OK i found a temporary fix so that I could have my laptop connected to a power source.

    basically I need to move the ac adapter into the back of the laptop so that it is BARELY plugged it (it will easily fall out if you touch it) but so that the laptop still recognizes itself as being connected to a power source but says "not charging"

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    Default Re: Latitude D620 extremely slow when charging

    Could be a number of problems... you've already eliminated any question of a power supply issue, so it must be an issue with the laptop. Based on what you're saying about moving the adapter around, you might just have a bad jack. If you're solder savvy, that should be simple to fix, but if not, it might cost just as much to have a shop replace the jack than to buy a new motherboard.

    EDIT: Come to think of it, are you still under warranty?
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    Default Re: Latitude D620 extremely slow when charging

    yea, i think i'm still under warranty

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    Default Re: Latitude D620 extremely slow when charging

    You should just call up Dell and have them replace your motherboard then. Tell them you've got this problem and that you've confirmed that the issue isn't with the power brick. They should give you a new board without too much hassle.
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    Default Re: Latitude D620 extremely slow when charging

    The centre pin of the PSU connector is used to carry the signal for the PSU type. Something is not connecting properly.

    If you are out of warranty then the fix is to install and run RMClock and set throttling at 100%. This will over-ride the BIOS.

    John

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    Default Re: Latitude D620 extremely slow when charging

    thanks john i'm using rmaclock until finals are over then i'll have dell replace it

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    Default Re: Latitude D620 extremely slow when charging

    I have the exact same problem, but my Latitude D620 is out of warranty. I have installed RMClock, but I am not sure how to set the throttling at 100%. Can anyone explain to me how to do this? I am running Windows 7

 

 

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