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HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

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    HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

    HP Envy X360
    Motherboard:Laduree 1.0 MB 14257-2
    CPU:SR23W i7-5500U
    KBC:ENE KB9028Q C

    At first, the board was dead no lights nothing after connecting the charger.

    After visual inspection, I noticed damaged components in the charging circuit:
    PR4408, PR4415, PR4416, PU4406
    I replaced them (including high side and low side MOSFETs PU4406 and PU4405).
    Later on the 20th leg of the charger, I still had low resistance, so I replaced the charger chip
    After replacing the charger chip I have a white led when I plug the charger.

    At this moment laptop behave like this:
    After I press the power button the light on the power button blink white for a second a fan twitch for a little
    After further measurements, I've noticed no voltage 3.3v and 5v on coils PL4501,PL4502

    Here are my measurements:
    Resistance on coils :
    PL4501 - Resistance in mega Ω
    PL4502 - Resistance in mega Ω
    PL4901 - 660k Ω
    PL1 - Resistance in mega Ω
    PL4701 - 62.9 Ω
    PL4801 - 233k Ω
    PL8201 - 21 Ω

    PU4503
    Pin 3 (VREG3) - 3.29v
    Pin 6 (EN2) - 0v
    Pin 12 (VIN) - 19.5v
    Pin 13 (VREG5) - 5v
    Pin 20 (EN1) - 0v

    Resistance:
    Pin 6 (EN2) - 12k Ω
    Pin 20 (EN1) - 12k Ω

    U2401
    Pin 67 (AVCC) - 3.29v
    Pin 91 (5V_S5_EN) - 0v
    Pin 101 (3V_S5_EN) - 0v
    Pin 103 (RSMRST#) - 0v
    Pin 110 (ACIN#) - 0v
    Pin 111 (VCC) - 3.29v

    Looks like KBC doesn't issue a turn-on signal for 3v/5v driver chip.
    I've tried to reprogram Bios and KBC chip with a dump from HP update and still, nothing changed, then I replaced KBC with a new one and programmed it with a dump from HP update and still nothing.
    I'm out of ideas right now.
    Thank you for any help and ideas on what I should do next.

    #2
    Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

    Link the schematic if available. What is the measurement for ACOK/ACDET/VCC/REGN pins??

    Comment


      #3
      Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

      Schematic is available link is down below
      https://drive.google.com/file/d/1CxX...JchV4hgRl/view
      Here are my measurements
      5 - ACOK#- 0v
      6 - ACDET- 2.6v
      20 - VCC- 19.4v
      16- REGN- 6v

      Comment


        #4
        Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

        Thanks
        Mohammed Mohan

        Comment


          #5
          Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

          Any ideas ?

          Comment


            #6
            Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

            What is the voltage of ACDRV pin on the charger IC?

            Check the voltage on the gate pin #4 of the 2x DCin mosfets.

            Post all measurements.

            Comment


              #7
              Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

              Originally posted by mon2 View Post
              What is the voltage of ACDRV pin on the charger IC?

              Check the voltage on the gate pin #4 of the 2x DCin mosfets.

              Post all measurements.
              Can't find ACDRV pin on my charger IC.
              I'll attach a part of schematic with my charging ic.


              On the gate of PU4402 and PU4403 I have 6.5V
              Attached Files

              Comment


                #8
                Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

                For P-channel mosfets, the GATE voltage has to be more negative than the voltage it is passing to enable. Looks ok @ pin #4.

                Remove all power and check the resistance across the mosfets.

                Comment


                  #9
                  Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

                  Originally posted by mon2 View Post
                  For P-channel mosfets, the GATE voltage has to be more negative than the voltage it is passing to enable. Looks ok @ pin #4.

                  Remove all power and check the resistance across the mosfets.
                  PU4402
                  S-D 340k
                  D-S 340k

                  D-G 290k
                  G-D 290k

                  S-G 125k
                  G-S 125k

                  PU4403
                  S-D 235k and rising
                  D-S 235k and rising

                  D-G 400k and rising
                  G-D 400k and rising

                  S-G 100k
                  G-S 100k

                  Comment


                    #10
                    Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

                    It's a HP. You're working with known good charger of correct wattage?
                    FairRepair on YouTube

                    Comment


                      #11
                      Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

                      Originally posted by Sephir0th View Post
                      It's a HP. You're working with known good charger of correct wattage?
                      I have tried with 2 different know good hp 65w chargers and got the same results.
                      Later I connected board to lab power supply with a prepared HP cable with resistor between + and ID pin which simulated 90w power supply
                      Last edited by TTR; 09-26-2022, 02:01 PM.

                      Comment


                        #12
                        Re: HP Envy X360 Laduree 1.0 MB 14257-2 turns on and off

                        U2401- Pin 103 (RSMRST#) - 0v

                        Being an active LOW signal, this pin is stuck in reset mode.

                        Comment

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