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MBA A1932 820-01521-A no Post after few seconds it restarts

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    #21
    Re: MBA A1932 820-01521-A no Post after few seconds it restarts

    Originally posted by mon2 View Post
    On the A1932, post the voltage readings of:

    SMBUS_3V3_BATT_SCL
    SMBUS_3V3_BATT_SDA
    I will do the measurements tomorrow and get back to you.
    Thank you

    Comment

      #22
      Re: MBA A1932 820-01521-A no Post after few seconds it restarts

      Originally posted by mon2 View Post
      On the A1932, post the voltage readings of:

      SMBUS_3V3_BATT_SCL
      SMBUS_3V3_BATT_SDA
      SMBUS_3V3_BATT_SCL: 3.297V
      SMBUS_3V3_BATT_SDA: 3.297V

      *there small fast fluctuations between 3.297V and 3.289V

      Comment

        #23
        Re: MBA A1932 820-01521-A no Post after few seconds it restarts

        ALL_SYSPWRGD: 1.8V it should be higher volt.

        Comment

          #24
          Re: MBA A1932 820-01521-A no Post after few seconds it restarts

          Originally posted by dellxps15 View Post
          ALL_SYSPWRGD: 1.8V it should be higher volt.
          how many volts should it be?

          Comment

            #25
            Re: MBA A1932 820-01521-A no Post after few seconds it restarts

            Confirm with the schematics but believe that the pull-up resistor is to 1v8 so ALL_SYSPWRGD is ok at 1v8.

            What is the exact voltage at PPBUS_G3H ?

            Comment

              #26
              Re: MBA A1932 820-01521-A no Post after few seconds it restarts

              Originally posted by mon2 View Post
              what is the exact voltage at ppbus_g3h ?
              ppbus_g3h: 12.63v

              Comment

                #27
                Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                Check each of the following rails:

                PP1v8_S3: Normal voltage is ~1.8v. Produced from U7800. (Powers system RAM.)

                PP1v2_S3: Normal voltage is ~1.2v. Produced from U8100/Q8100. (Powers system RAM.)

                PP1v_S3: Normal voltage is ~1.0v. Produced from U7800. (Powers some CPU functions.)

                Comment

                  #28
                  Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                  Originally posted by mon2 View Post
                  Check each of the following rails:

                  PP1v8_S3: Normal voltage is ~1.8v. Produced from U7800. (Powers system RAM.)

                  PP1v2_S3: Normal voltage is ~1.2v. Produced from U8100/Q8100. (Powers system RAM.)

                  PP1v_S3: Normal voltage is ~1.0v. Produced from U7800. (Powers some CPU functions.)
                  PP1v8_S3: 1.799V
                  PP1v2_S3: 1.199V
                  PP1v_S3: 1.004V

                  Comment

                    #29
                    Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                    The PCH will then de-assert (pull low) PM_SLP_S3_L and PM_SLP_S0_L momentarily to enable the final stage in the power up sequence.

                    Confirm the following voltages:

                    PP1v2_S0SW: Normal voltage is ~1.2v. Produced from U8240.

                    PP1v_S0SW: Normal voltage is ~1.0v. Produced from U7800.

                    PPVCCIO_S0_CPU: Normal voltage is ~0.95v. Produced from U8110/Q8102.

                    PPVCCSA_S0_CPU: Normal voltage is ~1.5v. Produced from U7100/U7290/Q7291.

                    PPVCORE_S0_CPU: Normal voltage is ~ 0.75v. Produced from U7100/U7210/U7230.

                    PPVCCGT_S0_CPU: Normal voltage is ~ 0.75v. Produced from U7100/U7410/U7430.

                    Comment

                      #30
                      Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                      Originally posted by mon2 View Post
                      The PCH will then de-assert (pull low) PM_SLP_S3_L and PM_SLP_S0_L momentarily to enable the final stage in the power up sequence.

                      Confirm the following voltages:

                      PP1v2_S0SW: Normal voltage is ~1.2v. Produced from U8240.

                      PP1v_S0SW: Normal voltage is ~1.0v. Produced from U7800.

                      PPVCCIO_S0_CPU: Normal voltage is ~0.95v. Produced from U8110/Q8102.

                      PPVCCSA_S0_CPU: Normal voltage is ~1.5v. Produced from U7100/U7290/Q7291.

                      PPVCORE_S0_CPU: Normal voltage is ~ 0.75v. Produced from U7100/U7210/U7230.

                      PPVCCGT_S0_CPU: Normal voltage is ~ 0.75v. Produced from U7100/U7410/U7430.
                      PP1v2_S0SW: 1.198V

                      PP1v_S0SW: 1.007V

                      PPVCCIO_S0_CPU: 0.957V at R8102, there is no PPVCCIO_S0_CPU at U8110/Q8102

                      PPVCCSA_S0_CPU: 1.109V from R7290, 1.144V from Q7291 CPUSA_SW_LL

                      PPVCORE_S0_CPU: 0.839V from R7230, R7210

                      PPVCCGT_S0_CPU: 0V from R7410, R7430 actually L7410, L7430 have 0V as well

                      Comment

                        #31
                        Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                        Is your trackpad / keyboard connected during these tests ?

                        Remove them if they are and test again.

                        You can use the ON/OFF button in the bottom right of the PCB to turn the logic board on/off (SWE010; PMU_ONOFF_L)
                        Attached Files

                        Comment

                          #32
                          Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                          Originally posted by mon2 View Post
                          Is your trackpad / keyboard connected during these tests ?

                          Remove them if they are and test again.

                          You can use the ON/OFF button in the bottom right of the PCB to turn the logic board on/off (SWE010; PMU_ONOFF_L)
                          all my tests are with the board out, that part of my board looks different..
                          Attached Files

                          Comment

                            #33
                            Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                            I want to take the time a THANK YOU for the effort and time your are spending helping me,
                            I really appreciate it!

                            Comment

                              #34
                              Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                              Originally posted by mon2 View Post
                              Is your trackpad / keyboard connected during these tests ?

                              Remove them if they are and test again.

                              You can use the ON/OFF button in the bottom right of the PCB to turn the logic board on/off (SWE010; PMU_ONOFF_L)
                              did the tests again and the same results

                              Comment

                                #35
                                Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                                Reflash the T2 Rom (U2890; 3v3 device) using the dump from here:

                                https://www.badcaps.net/forum/showth...ight=rom+dumps

                                * backup your original flash before erasing the device
                                Attached Files

                                Comment

                                  #36
                                  Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                                  U2890 is USB-C controller ROM, not T2.
                                  OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                                  Comment

                                    #37
                                    Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                                    Originally posted by mon2 View Post
                                    Reflash the T2 Rom (U2890; 3v3 device) using the dump from here:

                                    https://www.badcaps.net/forum/showth...ight=rom+dumps

                                    * backup your original flash before erasing the device
                                    reflashed (was fun removing that cover...) same voltages

                                    Comment

                                      #38
                                      Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                                      Originally posted by PACh View Post
                                      reflashed (was fun removing that cover...) same voltages
                                      Did you see post #36
                                      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                      Comment

                                        #39
                                        Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                                        U2890 is USB-C controller ROM, not T2.
                                        My bad - all in the basket of Tx propreitary crapware. The TBT rom was only to confirm the image is stable to maintain the 20V power delivery contracts.

                                        Is the display attached ? Can you test without the display to see if the results are different ?

                                        Can you confirm the voltages for the SOC ROM ?

                                        Check the Vcc; MISO; MOSI pins. Suspecting some I2C / SMBUS / SPI widget is timing out and the boot process restarts / loops.
                                        Attached Files

                                        Comment

                                          #40
                                          Re: MBA A1932 820-01521-A no Post after few seconds it restarts

                                          Originally posted by mon2 View Post
                                          My bad - all in the basket of Tx propreitary crapware. The TBT rom was only to confirm the image is stable to maintain the 20V power delivery contracts.

                                          Is the display attached ? Can you test without the display to see if the results are different ?

                                          Can you confirm the voltages for the SOC ROM ?

                                          Check the Vcc; MISO; MOSI pins. Suspecting some I2C / SMBUS / SPI widget is timing out and the boot process restarts / loops.
                                          Wait so I should have reflashed the T2 Rom chip not the U2890? I reflashed the U2890 NOT the T2 rom U4770

                                          Comment

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