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HP ENVY 17 Motherboard Short help please

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    HP ENVY 17 Motherboard Short help please

    Motherboard Model: DAY31AMB6C0 REV C

    I was able to find out the boardview and the schematics from the forum. I see there is a short but I can't find out where it is. all the 3v 5v 19.5 are short to ground. when I remove 3v step down regulator, 19v rail is okay but still 3v & 5v inductors short to ground but only LDO signal from 5v chip okay.

    I injected 1v to 3v rail and I was able to see that CPU is heating.

    Can you guys help me to fix this. I really want to fix this motherboard.

    Special: I shorted power switch pin 1 to ground by mistake. Thats the cause to happen this. When I see schematic pin 1 is 3vpcu.

    Anyone can help please???

    #2
    Re: HP ENVY 17 Motherboard Short help please

    Anyone please ��

    Comment


      #3
      Re: HP ENVY 17 Motherboard Short help please

      Originally posted by harshana View Post
      Anyone please ��
      Do you have a DC power supplt to inject voltage with
      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

      Comment


        #4
        Re: HP ENVY 17 Motherboard Short help please

        Originally posted by SMDFlea View Post
        Do you have a DC power supplt to inject voltage with
        Yes I injected 1v with 3A

        Comment


          #5
          Re: HP ENVY 17 Motherboard Short help please

          Originally posted by SMDFlea View Post
          Do you have a DC power supplt to inject voltage with
          Here are the schematics and boardview

          [MOD EDIT] Link to schematic -> https://www.badcaps.net/forum/troubl...b6c0-schematic

          19v short solved when I remove PU11 chip. but still other power rails short to ground.

          when I inject power to 3v rail, PU6 got heated. So I removed it and checked. So I removed that one as well. Then PU8 got heated. So I moved PU5,PU6,PU8.

          Then I see that the CPU is heating.
          Last edited by SMDFlea; 12-11-2023, 05:02 PM.

          Comment


            #6
            Re: HP ENVY 17 Motherboard Short help please

            ��

            Comment


              #7
              Re: HP ENVY 17 Motherboard Short help please

              Can you post the full details of how you are finding the above to be shorted ?

              Remove all power -> meter in lowest resistance scale -> meter probe on the 3v rail; other meter probe to ground.

              What is the exact reading to ground ? Post the measurement and also the scale used on your meter for this measurement. If possible, share a pic of the meter.

              Comment


                #8
                Re: HP ENVY 17 Motherboard Short help please

                When I power DC jack using power supply, It takes more than 2A. Thats how I detect the 19v rail short. will upload meter readings soon

                Comment


                  #9
                  Re: HP ENVY 17 Motherboard Short help please

                  Originally posted by mon2 View Post
                  Can you post the full details of how you are finding the above to be shorted ?

                  Remove all power -> meter in lowest resistance scale -> meter probe on the 3v rail; other meter probe to ground.

                  What is the exact reading to ground ? Post the measurement and also the scale used on your meter for this measurement. If possible, share a pic of the meter.
                  Probe resistance: 0.4ohm

                  Scale: 200ohm (Digital Multi meter UT33B+)

                  PQ33(First Mosfet) Pin 1,2,3 -----> 0.7ohm

                  PQ20(2nd Mosfet) Pin 1 -----> 1.7ohm & Pin 3 ---->0.4ohm



                  PL21 (3v Rail Inductor) -----> 0.4ohm

                  PL20 (5v Rail Inductor) -----> 1.8ohm

                  PL16 (1.05 Rail Inductor) -----> 0.7ohm

                  PL12 & PL13 (+VGACORE according to schematics) -----> 10ohm

                  Comment


                    #10
                    Re: HP ENVY 17 Motherboard Short help please

                    Probe resistance: 0.4ohm

                    Scale: 200ohm (Digital Multi meter UT33B+)

                    PQ33(First Mosfet) Pin 1,2,3 -----> 0.7ohm

                    PQ20(2nd Mosfet) Pin 1 -----> 1.7ohm & Pin 3 ---->0.4ohm
                    Ok. This helps.

                    Pins 1-2-3 are expected to be shorted together since each is the SOURCE cluster of pins. The readings are ok.

                    Pin # 4 = GATE.

                    Then pins 5-6-7-8 will be grouped together = DRAIN cluster of pins.

                    To check if your mosfet is shorted, check the following:

                    source (1-2-3) ; pick any of these pins with one meter probe
                    drain (5-6-7-8) ; pick any of these pins

                    note the reading and post it here. If you see '1' or 'OL' -> then select a higher meter setting till you have an actual value.

                    The '1' / 'OL' means the meter scale is too low and your resistance is higher than say 200 ohms, etc.

                    A low resistance reading = defective mosfet.

                    Next,

                    source (1-2-3) & gate (4) ; post the reading
                    gate (4) & drain (5-6-7-8) ; post the reading


                    Repeat for the 2nd mosfet as well.

                    Comment


                      #11
                      Re: HP ENVY 17 Motherboard Short help please

                      Originally posted by mon2 View Post
                      Ok. This helps.

                      Pins 1-2-3 are expected to be shorted together since each is the SOURCE cluster of pins. The readings are ok.

                      Pin # 4 = GATE.

                      Then pins 5-6-7-8 will be grouped together = DRAIN cluster of pins.

                      To check if your mosfet is shorted, check the following:

                      source (1-2-3) ; pick any of these pins with one meter probe
                      drain (5-6-7-8) ; pick any of these pins

                      note the reading and post it here. If you see '1' or 'OL' -> then select a higher meter setting till you have an actual value.

                      The '1' / 'OL' means the meter scale is too low and your resistance is higher than say 200 ohms, etc.

                      A low resistance reading = defective mosfet.

                      Next,

                      source (1-2-3) & gate (4) ; post the reading
                      gate (4) & drain (5-6-7-8) ; post the reading


                      Repeat for the 2nd mosfet as well.

                      1st Mosfet = Source to Drain -----> 8.8kohm

                      2nd Mosfet (it only has 4 pins) = Source to Drain -------> 1.5ohm

                      see the attached photo also please
                      Attached Files

                      Comment


                        #12
                        Re: HP ENVY 17 Motherboard Short help please

                        I am not familiar with this logic board but for sure the 2nd part is not the mosfet for the DCin connection.

                        Can you zoom / look around the DC in power jack on your logic board ?

                        The ~19v will enter there -> then look for parts like the '#1' in your post = that is a mosfet and the 2nd mosfet will be similar.

                        We are interested to inspect the first 2 x DCin mosfets for this review.

                        Post pics so we can be sure.

                        Comment


                          #13
                          Re: HP ENVY 17 Motherboard Short help please

                          My mistake.

                          2nd Mosfet (it only has 4 pins) = Source to Drain -------> 0.5ohm

                          not 1.5

                          Comment


                            #14
                            Re: HP ENVY 17 Motherboard Short help please

                            According the schematics. thats the 2nd mosfet. Actually I'm new to this. Am I wrong?
                            Attached Files

                            Comment


                              #15
                              Re: HP ENVY 17 Motherboard Short help please

                              Ok. Just re-read this thread - found the schematic..hold for a few.

                              My bad...you are on the right track and are indexing the correct mosfets.

                              See attached for the pinout & datasheet for the 2nd mosfet.

                              Can you confirm that you are using the TAB and the right pin for the SOURCE & DRAIN resistance checks ?

                              This is reading @ 0.5 ohms ?? (you are on the lowest 200 ohm scale on your meter ?)
                              Attached Files
                              Last edited by mon2; 08-18-2022, 10:28 AM.

                              Comment


                                #16
                                Re: HP ENVY 17 Motherboard Short help please

                                Here is the board with DC jack
                                Attached Files

                                Comment


                                  #17
                                  Re: HP ENVY 17 Motherboard Short help please

                                  Why waste time on a dead PCH? (and many other things)
                                  OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

                                  Comment


                                    #18
                                    Re: HP ENVY 17 Motherboard Short help please

                                    I injected 1v to 3v rail and I was able to see that CPU is heating.

                                    Special: I shorted power switch pin 1 to ground by mistake. Thats the cause to happen this. When I see schematic pin 1 is 3vpcu.


                                    The CPU is very likely fried.

                                    Comment


                                      #19
                                      Re: HP ENVY 17 Motherboard Short help please

                                      Yes I can guarantee that I checked resistance between pin 4 and pin 3. I entered it as 1.5 by mistake. actual reading was 0.5ohms.

                                      and also my scale is 200ohm

                                      What did you mean by TAB?? I didn't get it.

                                      Comment


                                        #20
                                        Re: HP ENVY 17 Motherboard Short help please

                                        TAB is the middle of the 3 pins.

                                        So there is the LEFT, MIDDLE pin (broken) but is the metal TAB that is soldered and large in size, RIGHT pin.

                                        Comment

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