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No display ACER DAZ8ADMB6D0 REV D

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    #41
    Re: No display ACER DAZ8ADMB6D0 REV D

    Originally posted by stingerchamp View Post
    At pu11 you have 4.7 volt at pin9 and pin8 you have zero


    Voltage on coils pL 11 and PL13

    and also voltage on capacitor c124

    Measure and reply


    You don't have U11 ic? on this motherboard check schematic for u11 ic

    U11 ic not pu11 ok
    pl11 has 3.3v pl13 has 5v

    Comment


      #42
      Re: No display ACER DAZ8ADMB6D0 REV D

      Originally posted by stingerchamp View Post
      At pu11 you have 4.7 volt at pin9 and pin8 you have zero


      Voltage on coils pL 11 and PL13

      and also voltage on capacitor c124

      Measure and reply


      You don't have U11 ic? on this motherboard check schematic for u11 ic

      U11 ic not pu11 ok
      u11 all pins has 0v same with u15

      Comment


        #43
        Re: No display ACER DAZ8ADMB6D0 REV D

        Seems 3v also missing

        Always report fully

        You did not check voltage on coils
        PL 11 and PL13

        Comment


          #44
          Re: No display ACER DAZ8ADMB6D0 REV D

          Originally posted by stingerchamp View Post
          Seems 3v also missing

          Always report fully

          You did not check voltage on coils
          PL 11 and PL13
          pl11 has 3.3v pl13 has 5v sir sorry

          Comment


            #45
            Re: No display ACER DAZ8ADMB6D0 REV D

            Good

            It means 3v 5v ic is okay

            But U11 pins have zero voltage strange

            U11 is converting ,3v into 1.8v_s5


            Measure voltage on U11 pin 8 and Pu11 pin 8
            Relax and count pin correct

            Comment


              #46
              Re: No display ACER DAZ8ADMB6D0 REV D

              Originally posted by stingerchamp View Post
              Good

              It means 3v 5v ic is okay

              But U11 pins have zero voltage strange

              U11 is converting ,3v into 1.8v_s5


              Measure voltage on U11 pin 8 and Pu11 pin 8
              Relax and count pin correct
              rechecking the u11 pins nothing sir 0vs pin 8 of pu11 has 3.3v sir

              Comment


                #47
                Re: No display ACER DAZ8ADMB6D0 REV D

                Check voltage on pq12 all pins
                It is a 3v switch supply

                Check voltage on all pins of pq 41

                It is a 5v switch supply


                Measure and reply with pins

                Comment


                  #48
                  Re: No display ACER DAZ8ADMB6D0 REV D

                  Originally posted by stingerchamp View Post
                  Check voltage on pq12 all pins
                  It is a 3v switch supply

                  Check voltage on all pins of pq 41

                  It is a 5v switch supply


                  Measure and reply with pins
                  i cant loacate the pq12 sir on the board also the pq41

                  Comment


                    #49
                    Re: No display ACER DAZ8ADMB6D0 REV D

                    Pq12 is a mosfet which is providing +3v to U11 not pu11

                    Check page 35 schematic
                    Last edited by stingerchamp; 01-06-2021, 03:20 AM.

                    Comment


                      #50
                      Re: No display ACER DAZ8ADMB6D0 REV D

                      Originally posted by stingerchamp View Post
                      Check voltage on pq12 all pins
                      It is a 3v switch supply

                      Check voltage on all pins of pq 41

                      It is a 5v switch supply


                      Measure and reply with pins

                      this two , mosfet has 5v on both 5 pins 1234 has 0vs


                      the two mosfet is
                      e070bn mosfet

                      Comment


                        #51
                        Re: No display ACER DAZ8ADMB6D0 REV D

                        Is this pq12
                        Last edited by stingerchamp; 01-06-2021, 03:19 AM. Reason: No marking on board

                        Comment


                          #52
                          Re: No display ACER DAZ8ADMB6D0 REV D

                          Originally posted by stingerchamp View Post
                          Is this pq11?
                          not so sure sir I think this is the pq41 sir not the pq11 the pq11 is a AO3404 transistor

                          Comment


                            #53
                            Re: No display ACER DAZ8ADMB6D0 REV D

                            Marking on board?

                            Ok

                            Now we getting close

                            Did you find pq12?

                            Comment


                              #54
                              Re: No display ACER DAZ8ADMB6D0 REV D

                              Originally posted by stingerchamp View Post
                              Marking on board?

                              Ok

                              Now we getting close

                              Did you find pq12?
                              nope sir I cant find the pq12 sir sorry that two mosfet is the only mosfet in the board nothing else the other is part o the 5v and 3v system msofet this two I cant sure if where is the pq12

                              https://www.badcaps.net/forum/showth...ht=DAZ8ADMB6D0

                              post 6 sir sample of my board same no marking on it
                              https://www.badcaps.net/forum/attach...4&d=1496140466
                              Last edited by kalilinux25; 01-06-2021, 03:27 AM.

                              Comment


                                #55
                                Re: No display ACER DAZ8ADMB6D0 REV D

                                Okay 5v is also ok

                                No problem

                                If you don't mind can you again measure pu9 pins 9, 14 and 18


                                Pq21 pin 3 value

                                Comment


                                  #56
                                  Re: No display ACER DAZ8ADMB6D0 REV D

                                  Originally posted by stingerchamp View Post
                                  Okay 5v is also ok

                                  No problem

                                  If you don't mind can you again measure pu9 pins 9, 14 and 18


                                  Pq21 pin 3 value
                                  Pu9 pin 9 14 18 has 0vs
                                  Pq21 has 15v voltage sir

                                  Comment


                                    #57
                                    Re: No display ACER DAZ8ADMB6D0 REV D

                                    Pu9 pin 18 is 3v_s5

                                    If it is zero means KBC vcc at 11 pin is missing


                                    Check vcc pin 11 of IT8987 KBC

                                    Comment


                                      #58
                                      Re: No display ACER DAZ8ADMB6D0 REV D

                                      Check when you press power button
                                      At Pu9 pin 9,18 ,16

                                      Comment


                                        #59
                                        Re: No display ACER DAZ8ADMB6D0 REV D

                                        Originally posted by stingerchamp View Post
                                        Pu9 pin 18 is 3v_s5

                                        If it is zero means KBC vcc at 11 pin is missing


                                        Check vcc pin 11 of IT8987 KBC
                                        pin 11 has 0v

                                        pu9 pin 9 has 0v press goes to 1v then zero
                                        pin 18 0v press goes to 3.3v goes tpo zero again
                                        pin 16 0v press goes 1.7v then zero

                                        Comment


                                          #60
                                          Re: No display ACER DAZ8ADMB6D0 REV D

                                          KBC pin 11 check with button pressed
                                          Check pu9 pin 14 button pressed

                                          It should not be zero if zero means 3v is not reaching to KBC

                                          Check capacitor c65 both sides and resistor r814
                                          Last edited by stingerchamp; 01-06-2021, 09:50 PM.

                                          Comment

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