Turbo-X Quanta QL4 VCORE missing

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  • Nightwalker
    Senior Member
    • Oct 2012
    • 76
    • Greece

    #1

    Turbo-X Quanta QL4 VCORE missing

    Hello everyone

    Turbo-X laptop, same motherboard as LG R590.
    Laptop came after water felt on keyboard, turns on, fan start spinning for 1-2 seconds but nothing on screen(internal+external)
    Clean all the board with Isopropyl.
    All voltages seems ok, except VCORE voltage is 0-0.4
    GPU and CPU get hot as usual but fan wont startup again, only at boot(55 C temp after 2-3 minutes)
    I change ISL62882(CPU POWER IC), same readings(see attachment)
    Also attached schematic!
    Any ideas?
    Attached Files
  • atsio
    Badcaps Veteran
    • Oct 2013
    • 819
    • Greece

    #2
    Re: Turbo-X Quanta QL4 VCORE missing

    Give voltage on all pins of ISL62882

    Comment

    • Nightwalker
      Senior Member
      • Oct 2012
      • 76
      • Greece

      #3
      Re: Turbo-X Quanta QL4 VCORE missing

      Thanks for reply Atsio

      But what do you mean?

      Comment

      • atsio
        Badcaps Veteran
        • Oct 2013
        • 819
        • Greece

        #4
        Re: Turbo-X Quanta QL4 VCORE missing

        Measure the voltage with power button pressed on all pins of regulator

        Comment

        • Nightwalker
          Senior Member
          • Oct 2012
          • 76
          • Greece

          #5
          Re: Turbo-X Quanta QL4 VCORE missing

          Sorry for late answer, i was out of town..

          These readings are with power on(after button pressed)
          If power button is off only VIN, +5,+3 are enabled
          Forgot to tell, current goes at 0.86 and stays there!

          Comment

          • atsio
            Badcaps Veteran
            • Oct 2013
            • 819
            • Greece

            #6
            Re: Turbo-X Quanta QL4 VCORE missing

            You forgot the readings

            Comment

            • Nightwalker
              Senior Member
              • Oct 2012
              • 76
              • Greece

              #7
              Re: Turbo-X Quanta QL4 VCORE missing

              I mean these readings already posted at first post are with power on!

              Comment

              • atsio
                Badcaps Veteran
                • Oct 2013
                • 819
                • Greece

                #8
                Re: Turbo-X Quanta QL4 VCORE missing

                Sorry, I didn't noticed them

                Comment

                • atsio
                  Badcaps Veteran
                  • Oct 2013
                  • 819
                  • Greece

                  #9
                  Re: Turbo-X Quanta QL4 VCORE missing

                  21.5v is a little bit high. Why is that?

                  Comment

                  • Nightwalker
                    Senior Member
                    • Oct 2012
                    • 76
                    • Greece

                    #10
                    Re: Turbo-X Quanta QL4 VCORE missing

                    I'm using this:
                    http://www.inter-tech.de/index.php?o...id=247&lang=en
                    As a universal adapter, for different laptops, with no problems so far.
                    I can take readings with bench power supply if needed ;-)

                    BTW, why PGOOD is 0.07v?
                    Last edited by Nightwalker; 05-19-2014, 09:00 AM.

                    Comment

                    • atsio
                      Badcaps Veteran
                      • Oct 2013
                      • 819
                      • Greece

                      #11
                      Re: Turbo-X Quanta QL4 VCORE missing

                      If you remove the processor, do you have any voltage on PL7? What is the resistance to ground on PL7 with and without processor?

                      Comment

                      • Nightwalker
                        Senior Member
                        • Oct 2012
                        • 76
                        • Greece

                        #12
                        Re: Turbo-X Quanta QL4 VCORE missing

                        No voltage..resistance with cpu is 0.8 Ohm, 2.0 Ohm without CPU

                        Comment

                        • atsio
                          Badcaps Veteran
                          • Oct 2013
                          • 819
                          • Greece

                          #13
                          Re: Turbo-X Quanta QL4 VCORE missing

                          Remove pl7 and check which side has the short

                          Comment

                          • Nightwalker
                            Senior Member
                            • Oct 2012
                            • 76
                            • Greece

                            #14
                            Re: Turbo-X Quanta QL4 VCORE missing

                            I remove also PL8, short is at cpu side reading 10 ohm without CPU and 2.5 Ohm with CPU
                            MOSFET side reading is 180 Kohm and counting..

                            Comment

                            • atsio
                              Badcaps Veteran
                              • Oct 2013
                              • 819
                              • Greece

                              #15
                              Re: Turbo-X Quanta QL4 VCORE missing

                              Do you have voltage on mosfets side when you remove PL7 and PL8?
                              Use the regulated power supply to inject voltage on PL7 from the CPU side. Set voltage 0.5v and 0.5A and check if anything is getting hot. If there isn't any responce, increase amps slowly and check. Do that without CPU.

                              Comment

                              • Nightwalker
                                Senior Member
                                • Oct 2012
                                • 76
                                • Greece

                                #16
                                Re: Turbo-X Quanta QL4 VCORE missing

                                No voltage at all!
                                BUT..
                                I found the short, it was at PC172 NEC/TOKIN capacitor inside CPU socket. I begun desolder these caps before go with "whats hot" procedure and with the first i removed, short disappear. Now resistance is 50 Kohm falling without CPU, 28 Ohm with CPU!
                                After replace, next step is to replace again ISL, do you think its already fried?

                                Comment

                                • atsio
                                  Badcaps Veteran
                                  • Oct 2013
                                  • 819
                                  • Greece

                                  #17
                                  Re: Turbo-X Quanta QL4 VCORE missing

                                  Replace the TOKIN and then deside for the ISL

                                  Comment

                                  • Nightwalker
                                    Senior Member
                                    • Oct 2012
                                    • 76
                                    • Greece

                                    #18
                                    Re: Turbo-X Quanta QL4 VCORE missing

                                    Tokin replaced, now i have 0.04V at PL8, PL7 with and without CPU.
                                    PQ44, PQ45 mosfets (AON6428L) are fried..
                                    http://www.aosmd.com/pdfs/datasheet/AON6428L.pdf
                                    Can i replace them with:
                                    http://www.vishay.com/docs/73451/73451.pdf

                                    ??
                                    Last edited by Nightwalker; 05-20-2014, 10:31 AM.

                                    Comment

                                    • joelz
                                      Member
                                      • Aug 2013
                                      • 18
                                      • jakarta

                                      #19
                                      Re: Turbo-X Quanta QL4 VCORE missing

                                      Try to Remove PR34,PR23,PR38 end PR37 this will cut Isum- end Isum+ pin on isl626882 to calculed volted for feedback from inductor PL 7 power on the laptop end try to measure on PL7

                                      Comment

                                      • Nightwalker
                                        Senior Member
                                        • Oct 2012
                                        • 76
                                        • Greece

                                        #20
                                        Re: Turbo-X Quanta QL4 VCORE missing

                                        Hello again!

                                        I decide to change all mosfets with the originals(PQ45, PQ44, PQ39, PQ34 with AON6428L and PQ42, PQ41, PQ38, PQ33 with AON6718L) also change again the ISL.
                                        Same result, 0.04V at PL7, PL8 without CPU.

                                        Also remove the four resistors as Joelz suggest, power led flashing after power button pushed, 0.01V at PL7. With resistors back, power led stable and 0.04 again.

                                        Any suggestions?

                                        Comment

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