neeed help plz aspire E5-575 zaa2

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  • arber1232
    Badcaps Veteran
    • Dec 2019
    • 367
    • Albania

    #1

    neeed help plz aspire E5-575 zaa2

    hi . i have acer aspire E5-575 zaa2... . aptop does not turn on 19 v is ok. 3.3 v comes on the power button and the battery charge light turns on but does not turn on. I tried the bios I found on this forum but it does not work, do you have any idea what I can measure? And can i help mee .. this is shcematic
    Attached Files
    Last edited by SMDFlea; 11-25-2020, 06:31 AM. Reason: Added aspire E5-575 zaa2 to thread title
  • mcplslg123
    Badcaps Legend
    • Jun 2015
    • 7262
    • india

    #2
    Re: neeed help plz

    @arber1232, make your posts more meaningful by giving as much information as possible. What have you done to solve??What measurements you did?? With no such information, you cant really expect advice from others. Start with Page 43 of schematic where a nicely laid out power sequence is given. Check what you are missing.Next check page 44 .

    Comment

    • arber1232
      Badcaps Veteran
      • Dec 2019
      • 367
      • Albania

      #3
      Re: neeed help plz aspire E5-575 zaa2

      if i understand you then i'm telling you. I have an Acer laptop as I said above. the problem lies because it does not turn on. when I connect it to the laptop charger it turns on the charging light but I try to turn it on but it does not turn on .... I measured on the board that 19v is present .. The power button has 3.2v and the button is OK. I do not have 3.3v in the bios but when I press the power button then I have 3.3 in the bios ... I tried to program the bios but no change. . In ENE i have 3.3 volts. i do not have short in board.

      Comment

      • stingerchamp
        Badcaps Veteran
        • Sep 2020
        • 425
        • Pakistan

        #4
        Re: neeed help plz aspire E5-575 zaa2

        Remove rtc cell and battery and power plug

        In cold state, press power button for 30 sec and release.

        Put rtc cell back and power adapter plug in only.try to turn on.

        Then put battery back and turn on.

        If above fails check voltage on rtc cell and check rsmrst# signal and nbswon# signal


        Lastly for your information bios gets 3.3v when power button pressed only
        Last edited by stingerchamp; 11-25-2020, 06:56 AM.

        Comment

        • arber1232
          Badcaps Veteran
          • Dec 2019
          • 367
          • Albania

          #5
          Re: neeed help plz aspire E5-575 zaa2

          nbswon is okay goes to Ene and does the closing... yes 3.3 v is present in bios when i press power button

          Comment

          • arber1232
            Badcaps Veteran
            • Dec 2019
            • 367
            • Albania

            #6
            Re: neeed help plz aspire E5-575 zaa2

            rsmrst# signal i have 3.2 v in ENE when press power button

            Comment

            • stingerchamp
              Badcaps Veteran
              • Sep 2020
              • 425
              • Pakistan

              #7
              Re: neeed help plz aspire E5-575 zaa2

              It is a active on low signal.
              First verify at CLR you have 19volt
              Verify all rails are present ,+5,+3.3

              Check following signals and verify when you press power button how they react

              1- nbswon#
              2 - rsmrst#
              3- pltrst#
              4- hwpg
              5- dnbswon#

              If you are unable to find it
              Try going in cold check way
              Without any power check all big coils impedance all should be above 300 ohm except core and vccio.

              Comment

              • arber1232
                Badcaps Veteran
                • Dec 2019
                • 367
                • Albania

                #8
                Re: neeed help plz aspire E5-575 zaa2

                coil are not 300 0hm. were somewhere at 0.17 ohm .. i have 5 v +3.3 v. nbswon # is ok i have 3.2 volts and when i press power button change voltage ie changes according to the button ... rsmrst # is present an i have 3.4 v and not change whwn i press power button. pltrst # i find in ENE but is 0 v ..and not change when i pres power button .. hwpg is present in tps51225 in pin 7 ,, 3.0 v and in ENE is zero in pin 22 .. dnbswon # is 3,4 v but not change when i press power button

                Comment

                • arber1232
                  Badcaps Veteran
                  • Dec 2019
                  • 367
                  • Albania

                  #9
                  Re: neeed help plz aspire E5-575 zaa2

                  hwpg signal En1 i have 3.2 v. En2 3.2 V
                  Attached Files
                  Last edited by arber1232; 11-26-2020, 05:57 AM.

                  Comment

                  • stingerchamp
                    Badcaps Veteran
                    • Sep 2020
                    • 425
                    • Pakistan

                    #10
                    Re: neeed help plz aspire E5-575 zaa2

                    Pltrst# should be inactive means high

                    If it is zero means something wrong

                    You have power sequence at page42 of schematic.

                    Check imvp_pwrgd , check ec_pwrok

                    And list coil impedance here all coils.

                    Comment

                    • arber1232
                      Badcaps Veteran
                      • Dec 2019
                      • 367
                      • Albania

                      #11
                      Re: neeed help plz aspire E5-575 zaa2

                      motherboard is dead now missing all 3.3v

                      Comment

                      • stingerchamp
                        Badcaps Veteran
                        • Sep 2020
                        • 425
                        • Pakistan

                        #12
                        Re: neeed help plz aspire E5-575 zaa2

                        That is a bad sign

                        What happened ,did you short pin while checking

                        At page 42 you have power sequence
                        Follow it

                        Check 19v present at first DC Jack connector and

                        Comment

                        • Fernon
                          Member
                          • Apr 2019
                          • 13
                          • Sri Lanka

                          #13
                          Re: neeed help plz aspire E5-575 zaa2

                          i have same problem ....my 3v 5v power swtch 3.3V OK ....

                          MY NBSWON# voltage 3.3V DNBSWON# 2.6V When Press Powerkey RSMRST# Voltage not out ...pls give me a solution

                          Comment

                          • mon2
                            Badcaps Legend
                            • Dec 2019
                            • 13887
                            • Canada

                            #14
                            Re: neeed help plz aspire E5-575 zaa2

                            See attached.

                            Meter in DC volts setting.

                            Red meter probe to pin # 27. Black meter probe to ground.

                            Measure the voltage to ground @ pin #27 with the power switch open on the keyboard.

                            What is the voltage ?

                            Then press the power switch on the keyboard.

                            What is the voltage ?
                            Attached Files

                            Comment

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