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Hp 470 g2 - la-b181p

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    Hp 470 g2 - la-b181p

    Hello!

    Today i got a laptop that prior work has been done it the BIOS chip was removed, and 1 capacitor wasn't connected .
    So i re-purpose those .

    Now, when you plug in the charger, the "light" on the board itself (as you may now its a white blink led) , it will sudden rapid turns off turns off, like flickr , not the general code ,as we now (with beeps or indication lights).
    Just flickrs for a split second and cuts off.

    No power on ,no fan spin , nothing i suspect something from mosfet , with somewhere to be problem with ground.

    But my main furstration is that as soon as you plug in the charger, i cannnot measure not even with ground the charger it self, i mean you have 8 points that the DC Jack goes to on the board, i plug the multimeter (negative) to a hole/ ground and the red wire to , establish a connectionwith dc-jack and see how much volts are coming in .
    But nothing is coming in ...

    (The charger is 100% working without problem etc. tried 2-3 different chargers).

    So i suspect the protection goes on ?

    I don't know where to begin.

    i even found a schematic.
    Attached Files

    #2
    Re: Hp 470 g2 - la-b181p

    Here is video

    https://vimeo.com/651058480

    Comment


      #3
      Re: Hp 470 g2 - la-b181p

      New video...

      https://vimeo.com/651081448

      Non stop blinking light.

      Comment


        #4
        Re: Hp 470 g2 - la-b181p

        Plug in battery , orange light comes on volts go up , i believe it's charging the battery just fine.

        https://vimeo.com/651081430

        Comment


          #5
          Re: Hp 470 g2 - la-b181p

          When i press the power button i have to squize it a little more than general , and you can see the white light comes on , but keeps blinking...

          Tried good RAM (DDR3L + DDR3) both working 100% , just in case this was the problem.

          But again nothing.....
          Keeps blinking white....

          I read the BIOS chip to have it just in case. https://www.badcaps.net/forum/showpo...4&postcount=79 But i believe this is not the problem ?

          .
          Last edited by SMDFlea; 11-29-2021, 07:15 AM.

          Comment


            #6
            Re: Hp 470 g2 - la-b181p

            From the internet, white blinking light means low battery detected. For now, remove the battery.

            Does the vin rail from adapter remain stable when connected to the logic board? This is the first interconnect to the board.

            When logic board is on, can you measure the voltages at each coil to ground?

            Comment


              #7
              Re: Hp 470 g2 - la-b181p

              Originally posted by mon2 View Post
              From the internet, white blinking light means low battery detected. For now, remove the battery.

              Does the vin rail from adapter remain stable when connected to the logic board? This is the first interconnect to the board.

              When logic board is on, can you measure the voltages at each coil to ground?

              I haven't plugged in the battery.
              The board is bare naked. I just tested the battery in case it's charging.

              So far all good.

              But again , nothing else is showing...

              Comment


                #8
                Re: Hp 470 g2 - la-b181p

                Originally posted by mon2 View Post
                From the internet, white blinking light means low battery detected. For now, remove the battery.

                Does the vin rail from adapter remain stable when connected to the logic board? This is the first interconnect to the board.

                When logic board is on, can you measure the voltages at each coil to ground?
                I see 7 coils inthe front and none on the back.
                Most coils give me strange measuerments.
                Attached Files

                Comment


                  #9
                  Re: Hp 470 g2 - la-b181p

                  Extra video with coil check.

                  https://vimeo.com/651116285

                  Comment


                    #10
                    Re: Hp 470 g2 - la-b181p

                    Originally posted by AccountSaver View Post
                    Extra video with coil check.

                    https://vimeo.com/651116285
                    just type out and post the results here mate, why take us away from the site to watch through a video.Reading the results here takes seconds
                    All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                    Comment


                      #11
                      Re: Hp 470 g2 - la-b181p

                      See attached.

                      Check & post the voltage readings for the requested locations.

                      We are checking to see how far the DCIN (adapter) voltage travels through the logic board.
                      Attached Files

                      Comment


                        #12
                        Re: Hp 470 g2 - la-b181p

                        Originally posted by SMDFlea View Post
                        just type out and post the results here mate, why take us away from the site to watch through a video.Reading the results here takes seconds
                        The videos are just for showing in specific place what i get.
                        I will try and make sure the results , are on point and post them .

                        As soon as i start from somewhere...

                        Comment


                          #13
                          Re: Hp 470 g2 - la-b181p

                          Originally posted by mon2 View Post
                          See attached.

                          Check & post the voltage readings for the requested locations.

                          We are checking to see how far the DCIN (adapter) voltage travels through the logic board.
                          If i am getting it straight ( as you understand still learning ) .

                          You want me to measure the points : PQ102 ,PQ101, PR102.

                          Correct?

                          Comment


                            #14
                            Re: Hp 470 g2 - la-b181p

                            PQ 105
                            Entire one side has 2,53volt
                            The other side 19,65 volt
                            all stable measurments

                            PQ101
                            Entire one side 19,65
                            Entire other side 19,65 except last pin 6,12

                            PU102 and PQ102. I draw them here

                            Comment


                              #15
                              Re: Hp 470 g2 - la-b181p

                              and as i said, before it was blinking white light...

                              Now when you press the power button , it turns on the white light (and the light on the power button ribbon cable) stays on for 2-3 sec. and then sudden cuts off
                              (No fan spin, no heat anywhere)

                              Comment


                                #16
                                Re: Hp 470 g2 - la-b181p

                                I've tried more than 10 BIOS, all from forum, different threads ,some make the laptop completey dead. Without not even light ,but some make the laptop go ,to blinking white led mode (continous) non stop blinking (so it's not a code) . But again no fan spin , nothing on screen.
                                Some BIOS, make the laptop also go to a point that is showing steady white light , and then after 5-6 cuts off completely and goes dead.


                                No component is heating up (from bare hands)

                                Comment


                                  #17
                                  Re: Hp 470 g2 - la-b181p

                                  Any kind of help ?

                                  Comment


                                    #18
                                    Re: Hp 470 g2 - la-b181p

                                    Originally posted by mon2 View Post
                                    From the internet, white blinking light means low battery detected. For now, remove the battery.

                                    Does the vin rail from adapter remain stable when connected to the logic board? This is the first interconnect to the board.

                                    When logic board is on, can you measure the voltages at each coil to ground?
                                    Maybe last minute help ? I think i will throw the board...

                                    Comment

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