HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

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  • Sephir0th
    Badcaps Legend
    • Oct 2020
    • 1262
    • Germany

    #41
    Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

    This is not helpful. Voltage measurements are less than half of the "picture". Always check resistance to GND of the rails which are supposed to be up, but not coming up.

    I told already, you're probably dealing with multiple issues.
    FairRepair on YouTube

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    • Crabolog
      Member
      • Apr 2022
      • 30
      • Ukraine

      #42
      Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

      PU8
      pin 20 = 19.7v, infinite
      pin 16 = 6v, 65kOhm
      pin 4 = 25.5v, infinite

      PU12 acin = 65kOhm
      pu8 acpresent = 77kOhm
      acdet 70 kOhm

      pu7
      phase2 = 9kOhm
      lgate2 90kOhm
      phase1 20kOhm and rising
      lgate1 90kOhm
      entrip1 80 kOhm
      entrip2 90kOhm
      pgood 15kOhm and rising

      I'm not sure about power sequence here,what am I missing on pu7 to get powergood ?
      Last edited by Crabolog; 03-21-2023, 05:46 AM.

      Comment

      • mcplslg123
        Badcaps Legend
        • Jun 2015
        • 7262
        • india

        #43
        Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

        PU12 needs replacement or if you have all the tools and expertise, then cut the track of ACIN pin of PU12. If my memory is not failing PR175 is not populated and rather just a jumper. You need to disconnect ACIN. this pin is connected to charging IC. Actually PU12 is pulling down ACIN on charger IC. hence PU12 and charging IC needs isolation.

        However, the best option is to replace PU12 if you are not comfortable with this idea. This fault is quite common on Quanta R53/R33 board.

        Comment

        • Crabolog
          Member
          • Apr 2022
          • 30
          • Ukraine

          #44
          Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

          What should I check if I remove pr175? I still have 0.005v on PU8 pin5. Resistance to gnd is 75kOhms
          Last edited by Crabolog; 03-21-2023, 07:19 AM.

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          • Crabolog
            Member
            • Apr 2022
            • 30
            • Ukraine

            #45
            Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

            Same voltage and resistance on PU16 21 pin ACIN = 0.005v
            PU8:
            ACDET 2.75v
            ACN = 19.7V
            ACP = 19.7V
            VCC = 19.7
            CMSRC = 19.7V
            ACDRV = 25V
            PHASE = 2.8V
            SDA =3.3V
            SLC = 3.3V
            ILIM =3.3V
            SRP =2.8V
            SRN = 2.8V
            HIDRV = 2.8V
            LODRV = 0V
            BTST = 6V
            REGN6v = 5.99V
            ACPRES (ACIN) = 0.005V

            DC JACK ADID = 0.6v

            I'm not sure why acin is missing, will check pr80 and pr79
            Last edited by Crabolog; 03-21-2023, 10:37 AM.

            Comment

            • mon2
              Badcaps Legend
              • Dec 2019
              • 13913
              • Canada

              #46
              Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

              ACIN will have a pull-up on the pin as this is an open-drain output.

              So there is a logic low but will be floating when the adapter voltage is deemed to be ok. For this reason, the pull-up must be present to define the soft high state.

              Check the voltage to ground on each side of the pull-up resistor on this signal line.

              Comment

              • Crabolog
                Member
                • Apr 2022
                • 30
                • Ukraine

                #47
                Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                I assume pr80 is the pull up resistor here. It has 6v on one pin, and 0.005v on another pin that goes to ACIN on PU8.
                I've replaced it and pr79 with new 100k resistors, but no change.
                Resistance of pr80 to gnd is 85k, same for pr79

                PIN5 ACIN on pu8 has 80k to gnd
                Also I have 19.7v on pin1 of PR175 that I've removed, I assume that is not right.
                Last edited by Crabolog; 03-21-2023, 11:30 AM.

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 13913
                  • Canada

                  #48
                  Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                  Personally do not understand the need for PR79 in the circuit.

                  With both, PR79 & PR80 in the circuit, we have a voltage divider.

                  On such a design, PR79 should be removed and only an external pull-up (PR80) should be present.

                  Then the BQ charger can either drive a logic low (ie. 0 volts) onto this signal line OR allow for the pin to float / Hi-Z so that PR80 will pull the line HIGH to the REGN voltage.

                  Given that you see only 0v on this line and the resistance is not low, this can only mean that the charger IC is driving this pin LOW which results from the charger IC believing that the adapter voltage is absent or too low.

                  What is the voltage to ground of ACDET pin # 6 (with the power adapter connected) ? This is a threshold voltage that the adapter must meet or exceed to be detected.

                  Comment

                  • Crabolog
                    Member
                    • Apr 2022
                    • 30
                    • Ukraine

                    #49
                    Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                    ACDET pin 6 of PU8 = 2.75v
                    Last edited by Crabolog; 03-21-2023, 12:18 PM.

                    Comment

                    • mon2
                      Badcaps Legend
                      • Dec 2019
                      • 13913
                      • Canada

                      #50
                      Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                      See attached on the conditions that must be met before pin #5 will be in hi-Z state which will then allow for the external pull-up to bring this signal line to a logic '1'.

                      One of these conditions must be failing here.
                      Attached Files

                      Comment

                      • mon2
                        Badcaps Legend
                        • Dec 2019
                        • 13913
                        • Canada

                        #51
                        Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                        What is the voltage to ground of AD_TYPE ? This is the final shifted voltage used by the EC to detect the capacity of the power adapter. This pin is sampled by an analog to digital converter inside the EC @ U16.

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                        • Crabolog
                          Member
                          • Apr 2022
                          • 30
                          • Ukraine

                          #52
                          Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                          it's 0.598v

                          Comment

                          • mcplslg123
                            Badcaps Legend
                            • Jun 2015
                            • 7262
                            • india

                            #53
                            Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                            I've already given the solution. PR175 is not populated-so how you removed it? PR175 is a solid trace on motherboard and you need to cut that solid trace to isolate ACIN. Else,simply replace PU12.
                            Last edited by mcplslg123; 03-22-2023, 01:27 AM.

                            Comment

                            • mcplslg123
                              Badcaps Legend
                              • Jun 2015
                              • 7262
                              • india

                              #54
                              Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                              I've attached a image showing which trace is PR175 and where to cut the trace with an arrow.
                              Attached Files

                              Comment

                              • Crabolog
                                Member
                                • Apr 2022
                                • 30
                                • Ukraine

                                #55
                                Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                                Issue resolved after changing PU12, thanks

                                Comment

                                • mcplslg123
                                  Badcaps Legend
                                  • Jun 2015
                                  • 7262
                                  • india

                                  #56
                                  Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                                  Originally posted by Crabolog
                                  Issue resolved after changing PU12, thanks
                                  Well, glad to hear that you solved it. But, if you have acted earlier on my suggestion, precious time of others wont be wasted.

                                  Comment

                                  • mcplslg123
                                    Badcaps Legend
                                    • Jun 2015
                                    • 7262
                                    • india

                                    #57
                                    Re: HP Pavilion Laptop Motherboard Not Starting Up DA0R53MB6E1

                                    Originally posted by mcplslg123
                                    I've attached a image showing which trace is PR175 and where to cut the trace with an arrow.
                                    This problem can be resolved without replacing PU12, if you cut the trace at the marked area. have done that on many occassion.

                                    Comment

                                    • bembeno
                                      Badcaps Veteran
                                      • Feb 2016
                                      • 307
                                      • egypt

                                      #58
                                      Asking about DA0R53MB6E1 REV E R53 hp motherboard is the super io chip ( IT8518E ) should be programmed??

                                      Comment

                                      • mcplslg123
                                        Badcaps Legend
                                        • Jun 2015
                                        • 7262
                                        • india

                                        #59
                                        Not programmable. There may be separate EC bios chip near SIO.

                                        Comment

                                        • bembeno
                                          Badcaps Veteran
                                          • Feb 2016
                                          • 307
                                          • egypt

                                          #60
                                          Thank u man

                                          Comment

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