help with laptop dell DAJW8CMB8E1

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  • marcelofct
    Senior Member
    • May 2019
    • 122
    • chile
    #1

    help with laptop dell DAJW8CMB8E1

    good morning friends I hope you can help me I have this equipment and it does not turn on, I connect the charger and I have
    the 3.3v alw but not the 5v alw check the ic pu4 (RT8223PZQW)
    I do not have the entrip1 but I do have the entrip2, I assume that this is my problem to be able to activate the mosfet pq49 and pq45 according to my appreciation

    attached schematic

    please help
    Attached Files
    Tags: None
    • lapfix
      Badcaps Legend
      • Mar 2020
      • 2720
      • my workshop
      #2
      Re: help with laptop dell DAJW8CMB8E1

      Power sequence P 5/6 you must have this signal = ALW_ON to get +5V_ALW.so check this signal before

        Comment

        • marcelofct
          Senior Member
          • May 2019
          • 122
          • chile
          #3
          Re: help with laptop dell DAJW8CMB8E1

          Originally posted by lapfix
          Power sequence P 5/6 you must have this signal = ALW_ON to get +5V_ALW.so check this signal before
          checked ALW_ON and it is not generated by the kbc (IT8528) if it is not generated by the kbc, should I check if it has the 3.3v vcc? sorry for my little knowledge but I'm learning
          Last edited by marcelofct; 05-13-2021, 01:34 PM.

            Comment

            • marcelofct
              Senior Member
              • May 2019
              • 122
              • chile
              #4
              Re: help with laptop dell DAJW8CMB8E1

              someone with any ideas

                Comment

                • mon2
                  Badcaps Legend
                  • Dec 2019
                  • 14148
                  • Canada
                  #5
                  Re: help with laptop dell DAJW8CMB8E1

                  As per above advice,

                  1) see page 5 and follow the red circles which denote the power up sequence

                  2) ALW_ON is generated by the EC - check the direction of the arrows which indicates that the EC is using an output port pin to drive the ALW_ON signal.

                  3) What is the voltage reading of ALW_ON ? Place your meter in DC volts mode, then red probe on ALW_ON rail and black probe on ground.

                  You can read ALW_ON @ Q32B, pin # 2.

                  If this pin is not logic '1' = should be +3v3 (or close to this value) then the EC needs to be investigated.

                  Confirm that the trace is not broken between the EC and Q32B, pin # 2.

                    Comment

                    • marcelofct
                      Senior Member
                      • May 2019
                      • 122
                      • chile
                      #6
                      Re: help with laptop dell DAJW8CMB8E1

                      Originally posted by mon2
                      As per above advice,


                      What is the voltage reading of ALW_ON ? Place your meter in DC volts mode, then red probe on ALW_ON rail and black probe on ground.

                      the voltage is 0v pin 83 EC

                      You can read ALW_ON @ Q32B, pin # 2.

                      .-on pin 2 voltage is 0.1v

                      If this pin is not logic '1' = should be +3v3 (or close to this value) then the EC needs to be investigated.

                      Confirm that the trace is not broken between the EC and Q32B, pin # 2.
                      .-the trace is ok I measured continuity


                      thank for your help , i still learning

                        Comment

                        • Sephir0th
                          Badcaps Legend
                          • Oct 2020
                          • 1282
                          • Germany
                          #7
                          Re: help with laptop dell DAJW8CMB8E1

                          Resistance to ground of PQ32B Pin 2?
                          FairRepair on YouTube

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