GigaByte AX370 Gaming K7

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • foshland
    Senior Member
    • Jan 2017
    • 122
    • Spain

    #1

    GigaByte AX370 Gaming K7

    Hi to all, i have 2 of those motherboard, same model, same revision, the first one had BIOS corruption and is now working, the other one had BIOS corruption and I programmed them, motherboard starts but I only get 00 error on the 2 digit display, I have all the voltages OK and have tried with the bios chip from the working one, with same result. I have revised the socket and all the pins holes seems OK, If I put the oscilloscope in the BIOS chip I get no communication, just a straight line.

    What can I look now?

    I want to know if the BIOS chip should send in the pin 2 when powered up or if it is waiting comunication from another chip.

    Thanks to all
  • 90Ninety
    Senior Member
    • Aug 2011
    • 86
    • UK Mains Voltage 240V 50 Hz

    #2
    How did you program the BIOS chip .. did you remove it ? I had this board before , it has dual BIOS chip , and two switches on the motherboard at the bottom . The two switches were , one for allowing dual bios ( Off or On ) , the other to select which bios ( BIOS 1 or 2)

    You may have the Dual BIOS switch off , and are measuring or flashing an inactive chip ?

    Comment

    • foshland
      Senior Member
      • Jan 2017
      • 122
      • Spain

      #3
      Hi, I removed the 2 bios chip, and programmed the 4 of them (2 of every motherboard, with the last BIOS) and tested in the working board, they work ok, I know how the switches works and I´m using (in the non working board) in single bios mode, but it doesnt work in bios 1 nor bios 2.

      I use the same CPU (Ryzen 5 2600) in the 2 boards, and the same memmory module and PSU.

      The main problem I have is that I dont know if, when board is started, the BIOS chip is waiting for some data from the CPU or another part of the board, or if the BIOS, when powered up, will send data by itself.

      I dont see any kind of data in any pin of the bios chip using a oscilloscope in the non working board and If I take out the bios chip in the 2 boards, I see the same, no signal in any pin. In pin 8 I have 1.8V.


      The pin 2, 3, 4, 5, 6, 7 and 8 are shared between the main and backup BIOS, only pin 1 (CHIP SELECT) goes to a circuit that seems to choose main bios or backup, I think there is the problem, but I dont understand how it really works.

      Im uploading the PDF of the board, in case someone can give me some kind of help, the bios section is on page 9


      Thanks in advance





      Attached Files

      Comment

      • 90Ninety
        Senior Member
        • Aug 2011
        • 86
        • UK Mains Voltage 240V 50 Hz

        #4
        Try some of the eariler BIOS files .. Often you cannot jump BIOS versions , meaning you have to go from 21,22,23 and so on

        Comment

        • foshland
          Senior Member
          • Jan 2017
          • 122
          • Spain

          #5
          Tried earlier BIOS, nothing changed, I have no signal in any pin of the BIOS chips (measured with oscilloscope). I have checked all the resistors and componentes between bios chips and CPU socket, they are all OK.

          I think the CPU is not triying to read from BIOS, maybe it is in some kind of sleep state or similar, hope someone knows something about what to check now

          Comment

          • rogfanther
            Badcaps Veteran
            • Jul 2006
            • 458
            • Brazil

            #6
            Do you have more information about the initial "bios corruption" What caused it, etc ? Also, have you checked the CR2032 battery and socket, just to be sure ?

            Comment

            • foshland
              Senior Member
              • Jan 2017
              • 122
              • Spain

              #7
              Hi, no, I bought those 2 boards as broken, no more information of where they come from. The first board, the repaired one, had the 2 BIOS corrupted, just flashed them and the board is working perfect now. The second board, at first time, seemed to have the BIOS corruption too, but now im not sure, when the chips where connected in the board they where not readable, i had to desolder them, flashed and verify that they are ok, after that, I checked the no read from BIOS problem Im facing, I have tried the 4 bios chips in the working board and they work. The 4 chips in the non working board are not working, no signal in any pin, I have correct 1.8V at pin 8, but no other BIOS signal.

              Thanks to all

              Comment

              • rogfanther
                Badcaps Veteran
                • Jul 2006
                • 458
                • Brazil

                #8
                If the boards are really equal, prepare 2 bios chips with versions that work on the other board, and install on the patient one.

                Then , with cpu and ram, measure voltages on the working one. Not only the bios chip, because that is not the problem, but on most big inductors and mosfet´s near the cpu. Do the same then with cpu and ram installed in the second board.

                Comment

                • foshland
                  Senior Member
                  • Jan 2017
                  • 122
                  • Spain

                  #9
                  Hi again, meassured all the voltages possible against the working board and they are the same, 0.8 (aprox), 5, 12, 1.2, 1.8 and all the meassured ones. I am now thinking its something related to EC (I have 2 EC chips and 2 EC bios) or SIO chips.

                  (As far as I know I have Resume reset at 1.8V in the nearest test point to the CPU and continuity with that point and the CPU pin connection)

                  Can someone give me a direction to what more to test?

                  Thanks a lot

                  Comment

                  • anikin73
                    Senior Member
                    • Mar 2022
                    • 112
                    • singapore

                    #10
                    1) did you try and use oscilloscope to measure bios is read ?
                    2) I believe you did measure correctly all the voltages including CPU voltages. ? VCC 2.5 ?VDDQ ?
                    3 ) the reset signal at PCIE A11 is high ? is the clock signal at PCIE slot A13 A14 high ?
                    4 ) if so, you have to find the signal that will activate bios read ....
                    5) if all voltages have, then very hard to diagnose .sorry...

                    Comment

                    • anikin73
                      Senior Member
                      • Mar 2022
                      • 112
                      • singapore

                      #11
                      another 2 things you can do: look under microscope for broken lines or missing parts.

                      Comment

                      • foshland
                        Senior Member
                        • Jan 2017
                        • 122
                        • Spain

                        #12
                        Hi and thanks a lot for the guidance - help. I answer in red color, by now the pin A13 and A14 is low as I see, just 300mV, answer below.


                        Originally posted by anikin73
                        1) did you try and use oscilloscope to measure bios is read ? Yes, I did, no movement at any pin, just steady values (hi or low, but steady, no signal movement)
                        2) I believe you did measure correctly all the voltages including CPU voltages. ? VCC 2.5 ?VDDQ ? (Yes, I think I did, but only at coils, will try to post a image of values measured)
                        3 ) the reset signal at PCIE A11 is high ? Yes, Its 3.3V, but sometimes it goes to 0V for a little time and again and again. is the clock signal at PCIE slot A13 A14 high ? I just have 300mV in those pins
                        4 ) if so, you have to find the signal that will activate bios read .... please tell me how that signal is called, or tell me how this works, as i thought, the CPU sends CS (Chip select) to the bios and it sends info by pin 2 (or pin 5 dont know yet), but I think im missing something
                        5) if all voltages have, then very hard to diagnose .sorry... No sorry needed, you all helps me a lot to learn and any kind of help is invaluable, received as gold, so thanks to all

                        About looking with microscope, I have looked a lot and found nothing with the visual - microscope inspection

                        Comment

                        • anikin73
                          Senior Member
                          • Mar 2022
                          • 112
                          • singapore

                          #13
                          3 ) the reset signal at PCIE A11 is high ? Yes, Its 3.3V, but sometimes it goes to 0V for a little time and again and again. If drop to 0V means, some voltage not stable… or cpu contact is poor. ..
                          the 0V is it due to psu or motherboard restart ?

                          is the clock signal at PCIE slot A13 A14 high ? I just have 300mV in those pins​ . Yes it is. Let me check AMD motherboard,which signal will cause a signal to bios chip.

                          Comment

                          Related Topics

                          Collapse

                          Working...