Dell E6540 La-9412p

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  • Thermaltake
    Brain badcap
    • Aug 2015
    • 332
    • D12

    #1

    Dell E6540 La-9412p

    Hi, I have Dell E6540, and laptop was working strange. CPU always on 0,9Ghz, on startup when I press power button laptop was powering On than shuts down and power up again, and boot in Win. normal. But it's turning on and working.
    I disassemble the laptop and found on MBO that cap beside PQ706 have some black smoke on board and on the other side of the MBO section PU800 protective plastic that goes on top of the board have little whole on the plastic, meaning that this chip overheated and I see that one leg of that chip is damaged probably due overheat. My question is can only these two be the reason why laptop wasn't accepting battery, and CPU was working on 0.9Ghz only ?

    I manage to find new chip for PU800, but can't find the values of that cap.



    I attached pictures
    Attached Files
    Last edited by Thermaltake; 02-26-2023, 02:29 AM.
  • gs84
    Member
    • Dec 2022
    • 36
    • Ukraine

    #2
    Re: Dell E6540 La-9412p

    use schematics: 22U_0805_25V6K

    Comment

    • Thermaltake
      Brain badcap
      • Aug 2015
      • 332
      • D12

      #3
      Re: Dell E6540 La-9412p

      Thanks.

      Couldn't find it on schematics, I am expert in that field.

      Comment

      • reformatt
        Badcaps Legend
        • Feb 2020
        • 1403
        • Australia

        #4
        Re: Dell E6540 La-9412p

        Depends on what the cap is being used for in that part of the circuit. If it's just decoupling the main power rail (as it looks to be with two side by side), these are usually 10uf. If it's part of the boost circuit of a buck converter for example, then you need a donor or schematic to determine.

        Slow CPU speed and not charging with Dell's is the system not recognising the power adaptor via PSID.

        Comment

        • Thermaltake
          Brain badcap
          • Aug 2015
          • 332
          • D12

          #5
          Re: Dell E6540 La-9412p

          cap and bq chip changed, and laptop is working normal now. Thanks everyone

          Comment

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