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    Gigabyte GA-Z270P-D3 Boot Loop

    Bought this second hand motherboard.
    Seller told me was working fine.

    Boot loop happens

    24 pin + 8 pin power connectors without any processor, ram, mouse, keyboard installed. Loops inmediately, lasts half a second

    Power with only CPU installed, the loop lasts 2-3 seconds.

    No post, no beeps.
    Motherboard looks fine, nothing rusty or burnt.

    I´ve flashed official Gigabyte BIOS with CH341a usb programmer, both main & backup BIOS chip. Procedure finishes correctly.

    PCH gets warm even loop is very short. CPU keeps cold.

    Digital multimeter measurements:

    Inductors near PCH show 12v & 1v

    Inductors near cpu socket shows 1,02v & 0,86v

    Inductor near RAM socket shows 1,2v

    In continuity mode all solid capacitor seem good, even smd caps tested.

    There are other many smd chips i haven´t tested, dont know how.

    Bios chip is a Macronix 25L6473F, 8 pin is missing voltage.

    Two PSU´s & processors tested with the motherboard.

    Sorry for my horrible explanation, i am not a native english speaker.

    Thanks
    Last edited by pelolu; 07-03-2021, 10:21 AM.

    #2
    Re: Gigabyte GA-Z270P-D3 Boot Loop

    Check out some of the discussions on here by DICKY69 I only read briefly about how there is bios and also the TPU firmware which is like a pre-bios bios thing, Im not exactly sure if this applies to your board but a z270 is for sure a high end board.

    Sorry i cant be of much help
    Successfully completed Repairs:


    Current repairs:

    Comment


      #3
      Re: Gigabyte GA-Z270P-D3 Boot Loop

      @taxxin
      Actually it is SMDFlea that knows about the TPU firmware, I'm a beginner on that same as you. Apparently it does apply to all Zx70 motherboards

      Unfortunately so far we couldn't identify the TPU ROM on my board but I'll get back to it and have a good look tomorrow
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        #4
        Re: Gigabyte GA-Z270P-D3 Boot Loop

        Originally posted by taxxin View Post
        Check out some of the discussions on here by DICKY69 I only read briefly about how there is bios and also the TPU firmware which is like a pre-bios bios thing, Im not exactly sure if this applies to your board but a z270 is for sure a high end board.

        Sorry i cant be of much help
        Thanks for the answer.

        As far as i know my motherboard does not have the tpu module, or either i can´t find it.
        Thought it was a feature implemented in Asus motherboards.

        Comment


          #5
          Re: Gigabyte GA-Z270P-D3 Boot Loop

          I think I located the TPU ROM on my board
          https://www.badcaps.net/forum/showthread.php?t=83211
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            #6
            Re: Gigabyte GA-Z270P-D3 Boot Loop

            What about buying a new BIOS chip, and replace it with the M_BIOS one?.

            Is it possible that the main BIOS chip is defective somehow?

            Comment


              #7
              Re: Gigabyte GA-Z270P-D3 Boot Loop

              Main Bios

              Comment


                #8
                Re: Gigabyte GA-Z270P-D3 Boot Loop

                Just reprogram the BIOS_M and BIOS_B with a known good file
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                  #9
                  Re: Gigabyte GA-Z270P-D3 Boot Loop

                  Originally posted by dicky96 View Post
                  Just reprogram the BIOS_M and BIOS_B with a known good file
                  It´s useless, tried with Asprogrammer, Neoprogrammer, Colibri & a bunch of BIOS files downloaded from Gigabyte official web site and also the original dump file that came with the motherboard.

                  Must be a motherboard power issue, as the loop happens with no cpu installed.
                  Last edited by pelolu; 07-13-2021, 02:09 AM.

                  Comment


                    #10
                    Re: Gigabyte GA-Z270P-D3 Boot Loop

                    Tested the 12 Vcore mosfets with DMM.
                    4C010N (N channel 30v, 46A) Diode mode, drain-source voltage 0,496v
                    4C06N (N channel 30v, 69A) Diode mode, drain-source voltage 0,116v

                    High mosfets are low from specification 0,4-0,9v

                    Comment


                      #11
                      Re: Gigabyte GA-Z270P-D3 Boot Loop

                      Originally posted by pelolu View Post
                      Tested the 12 Vcore mosfets with DMM.
                      4C010N (N channel 30v, 46A) Diode mode, drain-source voltage 0,496v
                      4C06N (N channel 30v, 69A) Diode mode, drain-source voltage 0,116v

                      High mosfets are low from specification 0,4-0,9v
                      Test in ohms mode, 2k on the meter if you have that. one way should be 250-500 the other OL/1
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                        #12
                        Re: Gigabyte GA-Z270P-D3 Boot Loop

                        Originally posted by SMDFlea View Post
                        Test in ohms mode, 2k on the meter if you have that. one way should be 250-500 the other OL/1
                        Made further measurements in diode mode

                        4C010N reversing probes 0L
                        4C06N reversing probes 0.116v. Same as positive source & negative drain

                        4C06N resistance mode 100 ohms (caps after inductors have the same value)
                        4C010N resistance mode 9,26 kohms

                        Are all in circuit measurements.
                        I can´t activate the mosfets by putting positive probe in Gate & negative in Source.

                        Comment


                          #13
                          Re: Gigabyte GA-Z270P-D3 Boot Loop

                          Originally posted by pelolu View Post
                          Made further measurements in diode mode

                          4C010N reversing probes 0L
                          4C06N reversing probes 0.116v. Same as positive source & negative drain

                          4C06N resistance mode 100 ohms (caps after inductors have the same value)
                          4C010N resistance mode 9,26 kohms

                          Are all in circuit measurements.
                          I can´t activate the mosfets by putting positive probe in Gate & negative in Source.
                          Test in ohms mode
                          All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                          Comment


                            #14
                            Re: Gigabyte GA-Z270P-D3 Boot Loop

                            Originally posted by SMDFlea View Post
                            Test in ohms mode


                            I call it resistance mode, I think we are talking about the same, right?

                            Comment


                              #15
                              Re: Gigabyte GA-Z270P-D3 Boot Loop

                              Yes. The 600 setting is ok.
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                                #16
                                Re: Gigabyte GA-Z270P-D3 Boot Loop

                                Originally posted by SMDFlea View Post
                                Yes. The 600 setting is ok.
                                100 ohms mosfet OFF drain to source
                                The other way is mosfet ON?, can´t activate

                                Comment


                                  #17
                                  Re: Gigabyte GA-Z270P-D3 Boot Loop

                                  Tested all solid capacitors with ESR meter, all below the worst reference value.

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