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HP 15z-ab motherboard no power

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    HP 15z-ab motherboard no power

    I am attempting to repair a HP 15z-ab motherboard board number DA0X22MB6D0 REV D. When the charger is plugged in, the white led on the charger port turns on and when the power button is pressed 3V/5V comes up but the suspend voltages don't come and the fan doesn't even spin.
    I have checked for shorts on all the mosfets, I have checked for shorts on all the inductors, I have flashed the bios and I have replaced the 32.768KHz oscillator.
    Checking around the EC I have noticed that ECRST# and ECPWROK are both low, however RSMRST# is high. Any pointers on what I should check?

    Schematics and boardview attached
    Attached Files

    #2
    Re: HP 15z-ab motherboard no power

    what voltage are missing when press the PWBT DNBSWON# SUSB# SUSC# S5_ON +5VS5 +3VS5 ?

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      #3
      Re: HP 15z-ab motherboard no power

      After DNBSWON#, S5_ON is present but SUSB# and SUSC# are missing

      Comment


        #4
        Re: HP 15z-ab motherboard no power

        5vs5 +3vs5 ?

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          #5
          Re: HP 15z-ab motherboard no power

          +5VS5 and +3VS5 are present

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            #6
            Re: HP 15z-ab motherboard no power

            PU13 pin13 & 8 voltage ?

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              #7
              Re: HP 15z-ab motherboard no power

              There is 0v on both pins

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                #8
                Re: HP 15z-ab motherboard no power

                find out R5036 10K for any short, EC_RCIN# is low test resistance to ground U5001 pin 2 & 37 , pin 76 30 31 voltage ?

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                  #9
                  Re: HP 15z-ab motherboard no power

                  No short on R5036, resistance to ground on U5002 pin 2 is 1370 Ohms and infinite on pin 37.
                  Pin 30 = 0v
                  Pin 31 = 3.3v
                  Pin 76 = 2,95v

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                    #10
                    Re: HP 15z-ab motherboard no power

                    Originally posted by Zibbo View Post
                    No short on R5036, resistance to ground on U5002 pin 2 is 1370 Ohms and infinite on pin 37.
                    Pin 30 = 0v
                    Pin 31 = 3.3v
                    Pin 76 = 2,95v
                    if you have power LAB apply 3V to pin 37 SIO & see if any results on out put

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                      #11
                      Re: HP 15z-ab motherboard no power

                      I injected 3v on pin 37 and strangely ECRST# is now going high even after unplugging the charger. I tried injecting 3v on ECPWROK but the board still doesn't turn On

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                        #12
                        Re: HP 15z-ab motherboard no power

                        test
                        G1 SHORT_ PAD1 for 1.5V
                        R164 10K +3VS5
                        voltage on PL12 PL13 ?
                        +1.8VS5 is present ?
                        put a jumper from PU12( pin1 to 13) PU13 (pin1 to 13)( pin7 to 8) PU14 (pin1 to 13)( pin7 to 8) CPU should get worm power up & see

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