Dell Inspiron Mini 10 , 17v on power switch

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  • degutji
    Senior Member
    • Dec 2012
    • 173
    • Indonesia

    #1

    Dell Inspiron Mini 10 , 17v on power switch

    Have a nice day to u all,

    Need advice on MB KIU20 LA-9051P Dell Mini 10
    First Come with condition, Power on just for a few second and off,
    Plug power from my PSU show 0.002A - 0.025A, when I hit power on, the current not moving at all. JP42 ( on/off switch ) get 17v instead 3.3v as usual.
    5v and 3.3v is present, JBATT1 normal. What I have done :
    1. Flash Bios
    2. Reballing ICH7 Chip
    Problem still there...
    Actually there is Acer As 4937G with same problem power switch got 17v.
    Need advice from you all, what next...?

    Best Regards
    Attached Files
  • degutji
    Senior Member
    • Dec 2012
    • 173
    • Indonesia

    #2
    Re: Dell Inspiron Mini 10 , 17v on power switch

    Comment

    • cephei328
      sparky
      • Feb 2014
      • 49
      • NewZealand

      #3
      Re: Dell Inspiron Mini 10 , 17v on power switch

      Hi mate,

      This is strange issue which happens on some motherboards

      I have face this issue mostly in Acer motherboards where you will have 17 volts near power button instead of 3.3 volts

      But when you check pin 117 in EC/SIO chip it will read 3.3 volts.

      I have solved this issue by replacing BIOS chip (re-flashed) in Acer motherboard once.

      So try replacing BIOS chip

      Also check PQ1 on page 30.
      Good Luck
      Last edited by cephei328; 06-13-2014, 02:44 AM.

      Comment

      • degutji
        Senior Member
        • Dec 2012
        • 173
        • Indonesia

        #4
        Re: Dell Inspiron Mini 10 , 17v on power switch

        Thx Cephei

        re-flash bios chip with working one that I save before, exactly model and type.
        Yes Indeed, you are correct, on EC/SIO pin#117 and #32 it have 3.3v
        PQ1 on #1,2 read 17volts and #3 read 18volts
        Is it normal ?

        Comment

        • cephei328
          sparky
          • Feb 2014
          • 49
          • NewZealand

          #5
          Re: Dell Inspiron Mini 10 , 17v on power switch

          No its not normal. it should read 3.3 Volts

          Check PC9 for short

          Comment

          • degutji
            Senior Member
            • Dec 2012
            • 173
            • Indonesia

            #6
            Re: Dell Inspiron Mini 10 , 17v on power switch

            Originally posted by cephei328
            No its not normal. it should read 3.3 Volts

            Check PC9 for short
            No short on PC9 and PC10
            (Take out from MB and test with DMM)
            Last edited by degutji; 06-13-2014, 05:40 AM.

            Comment

            • whaldsz
              Badcaps Veteran
              • Apr 2013
              • 395
              • Philippines

              #7
              Re: Dell Inspiron Mini 10 , 17v on power switch

              17v is normal at 51_ON# upon plugging in the adapter. It should go low to 3.3v when you press the power button.

              Check pin 100 of SIO for 3.3v before/after power button is pressed. This will indicate if BIOS is working normally.

              Comment

              • degutji
                Senior Member
                • Dec 2012
                • 173
                • Indonesia

                #8
                Re: Dell Inspiron Mini 10 , 17v on power switch

                Originally posted by whaldsz
                17v is normal at 51_ON# upon plugging in the adapter. It should go low to 3.3v when you press the power button.

                Check pin 100 of SIO for 3.3v before/after power button is pressed. This will indicate if BIOS is working normally.
                Thx for your replies whaldsz

                there is no 3.3v before and after , it's that mean bios problem ?

                Comment

                • degutji
                  Senior Member
                  • Dec 2012
                  • 173
                  • Indonesia

                  #9
                  Re: Dell Inspiron Mini 10 , 17v on power switch

                  Comment

                  • whaldsz
                    Badcaps Veteran
                    • Apr 2013
                    • 395
                    • Philippines

                    #10
                    Re: Dell Inspiron Mini 10 , 17v on power switch

                    possibly yes. try reflash the BIOS then check for 3.3v at RSMRST# again.

                    Comment

                    • atsio
                      Badcaps Veteran
                      • Oct 2013
                      • 819
                      • Greece

                      #11
                      Re: Dell Inspiron Mini 10 , 17v on power switch

                      Your problem probably has to do with PQ1.

                      Comment

                      • arieshenri
                        Member
                        • Jul 2011
                        • 10

                        #12
                        Re: Dell Inspiron Mini 10 , 17v on power switch

                        Hi there, Just want to share my case.

                        Sometimes on some laptop, 17-18v on power switch is normal. Try hitting power button, then turn off, then check voltage on power switch, if it goes back to 3.3v, then it is normal. I also don't know why it happens.

                        For turn on then turn off after a couple seconds, i have this experience where gate on 5valw to 5vs switching mosfet have abnormal voltage. So 5valw is having 5v then try hitting power button - gate has voltage from ec / chipset (i forgot). But the output on 5vs is less than 5v (it was around 3-4v). Then assuming mosfet is broken, try finding replacement and replace the mosfet. Then try hitting power button, power drop has gone, 5vs has 5v. Then laptop working properly. Try tracing the alw voltage to vs voltage switching.

                        Hopefully it has the same problem that i have experienced.

                        Comment

                        • arieshenri
                          Member
                          • Jul 2011
                          • 10

                          #13
                          Re: Dell Inspiron Mini 10 , 17v on power switch

                          Bios problem usually is related to rsmrst# and s5_enable. But try it anyway, because it will not do any harm as long you have backup the original rom / bin.

                          Comment

                          • ponga
                            Member
                            • Nov 2012
                            • 10
                            • united arab emirates

                            #14
                            Re: Dell Inspiron Mini 10 , 17v on power switch

                            i just repair one acer at your same case, 17v on power pin, but in my case i found some corrosion in the motherboard, i just clean the corrosion, and i found a cold solder in the corrosion part. RESOLDER AND DONE..

                            Comment

                            • degutji
                              Senior Member
                              • Dec 2012
                              • 173
                              • Indonesia

                              #15
                              Re: Dell Inspiron Mini 10 , 17v on power switch

                              Originally posted by whaldsz
                              possibly yes. try reflash the BIOS then check for 3.3v at RSMRST# again.
                              Thx whaldsz, Still same, no 3.3v before and after ( flashing bios 2x )


                              Originally posted by atsio
                              Your problem probably has to do with PQ1.
                              Thx Atsio, replaced PQ1 but no change, still 17v

                              Originally posted by arieshenri
                              Hi there, Just want to share my case.

                              Sometimes on some laptop, 17-18v on power switch is normal. Try hitting power button, then turn off, then check voltage on power switch, if it goes back to 3.3v, then it is normal. I also don't know why it happens
                              Thx arieshenri, I'll try that

                              Originally posted by ponga
                              i just repair one acer at your same case, 17v on power pin, but in my case i found some corrosion in the motherboard, i just clean the corrosion, and i found a cold solder in the corrosion part. RESOLDER AND DONE..
                              Thx ponga, already do that before, maybe I miss on that area, I'll try any possible

                              Comment

                              • degutji
                                Senior Member
                                • Dec 2012
                                • 173
                                • Indonesia

                                #16
                                Re: Dell Inspiron Mini 10 , 17v on power switch

                                Still can't find on the problem is..

                                Comment

                                • whaldsz
                                  Badcaps Veteran
                                  • Apr 2013
                                  • 395
                                  • Philippines

                                  #17
                                  Re: Dell Inspiron Mini 10 , 17v on power switch

                                  then you need to replace the SIO chip. also check if the crystal is giving out 32.768Khz.

                                  Comment

                                  • atsio
                                    Badcaps Veteran
                                    • Oct 2013
                                    • 819
                                    • Greece

                                    #18
                                    Re: Dell Inspiron Mini 10 , 17v on power switch

                                    51_ON# should be low in order to open PQ1's gate. 51_ON# is geting low when EC_ON is high. No RTC voltage, something is stoping SIO from raising that signal. Check for shortages on coils, and if OK, replace SIO.

                                    Comment

                                    • dspok
                                      Badcaps Veteran
                                      • Jan 2014
                                      • 553
                                      • Nepal

                                      #19
                                      Re: Dell Inspiron Mini 10 , 17v on power switch

                                      I have same problem today, did you manage to solve it?

                                      Comment

                                      • polytek
                                        Badcaps Veteran
                                        • Dec 2013
                                        • 496
                                        • TUNISIA

                                        #20
                                        Re: Dell Inspiron Mini 10 , 17v on power switch

                                        hi, look at page 28, if the gate of Q12 is shorted to source, the 3.3V become 17V,
                                        check if Q12 is shorted, if yes replace and try to mesure again.
                                        Attached Files

                                        Comment

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