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Latitude D620 extremely slow when charging

Discussion in 'Dell Latitude, Vostro, and Precision' started by jshaw, Dec 9, 2009.

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  1. jshaw

    jshaw Notebook Enthusiast

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    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%.
     
  2. Commander Wolf

    Commander Wolf can i haz broadwell? Super Moderator

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    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.
     
  3. jshaw

    jshaw Notebook Enthusiast

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    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.
     
  4. jshaw

    jshaw Notebook Enthusiast

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    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"
     
  5. Commander Wolf

    Commander Wolf can i haz broadwell? Super Moderator

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    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?
     
  6. jshaw

    jshaw Notebook Enthusiast

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    yea, i think i'm still under warranty
     
  7. Commander Wolf

    Commander Wolf can i haz broadwell? Super Moderator

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    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.
     
  8. John Ratsey

    John Ratsey Moderately inquisitive Super Moderator

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    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
     
  9. jshaw

    jshaw Notebook Enthusiast

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    thanks john i'm using rmaclock until finals are over then i'll have dell replace it
     
  10. Dan141

    Dan141 Newbie

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    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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