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820-3662 - Fans spin for a few seconds over and over.

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  • 820-3662 - Fans spin for a few seconds over and over.

    As in the title the fans spin for a few seconds then stop. Then spin a few seconds then stop and so for ever.

    Laptop looks absolutely spotless. Customer said it has been in a cupboard for a couple months.


  • #2
    CPU Vcore on L7310 coming on?

    Comment


    • #3
      Trying to find documentation for this board.

      Will get back to you shortly.

      Comment


      • #4
        Sorry, I thought I had the info for this board. Had it confused with the 3332 for a second.

        L7310 is very unstable. It goes from 1.7v down to 0 and back up.

        PP5v_S0 @ C7310 keeps dropping out.

        Comment


        • #5
          PP5v_s5 is stable at 5.04v
          PP5v_s4 drops to 0v every four or five seconds.

          Comment


          • #6
            U8170::4 drops to 0 every few seconds.

            This controls PP5vS4_EN.

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            • #7
              Power cycling.....Could be absolutely anything if there is no water damage. Inspect for corrosion or damaged/missing parts. This kind of behavior usually does not "just" happen.

              Comment


              • #8
                So the problem is not with U8170?

                The board is spotless, no corrosion what-so-ever.

                Just to be clear, only the 5v rails are power cycling and only from PP5vS4_EN.

                pp5v_S5 is stable.
                Last edited by gcain; 04-23-2017, 09:08 PM.

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                • #9
                  Why would U8170 be responsible, it is just SLP_S5 cycling? The whole board is power cycling and this could be anything. Unless you can find a clue this thing will be a nightmare.

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                  • #10
                    Hang on, I think I'm missing something here.

                    The whole board isn't power cycling. PP5v_S5 (and the 3v lines) is rock solid stable, only PP5v_S4 and onwards are cycling.
                    The power going into U8170 is stable, but the PP5v_S4_EN coming out is going up and down.

                    If the board keeps loosing the 5v_S4_EN signal, wouldn't this cause the 5v power rails above S4 to keep dropping out?

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                    • #11
                      Yes that is called power cycling. S5 is of course fine. My verdict still stands, this board is a rabbit hole without any clues to what happened. Could be corrupt BIOS if you want to try that, backup the original!

                      Comment


                      • #12
                        OK thanks.
                        Been a steep learning curve on this board...

                        Do you happen to have a bios binary for the 3662 with a clean ME region handy?

                        Comment


                        • #13
                          Here is a locked 3662, good enough for testing I guess. If it works we can fix your original BIOS.
                          https://drive.google.com/open?id=0By...WZfM3VZT3Q1WWs

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                          • #14
                            Thanks for that!

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                            • #15
                              This board came back to me finally.

                              Flashed the bios, exactly the same behaviour.

                              Sometimes only one fan spins. :/

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