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    HP 15-B142DX No image

    HP 15-B142DX DA0U56MB6E0 Rev. E after water damage i have black screen, Laptop with external monitor is working ok.

    On U1 chip i have +3V on pin 4,5 but 0V on pin 1 & 3

    On U16 chip i have 3.3V on pin 3, 9,10, 13, 18

    pin 16 ---> 3,02

    but pin 14,15 ---> 0V

    Any help or idea where is the problem, where to check next

    Thanks
    Attached Files

    #2
    Re: HP 15-B142DX No image

    for the U21 pin 3 should get PCH DISP ON signel to +3V to transfer +LCDVCC +3VLCD CON L3 coil
    test Pin 16&15 for resistance to GND
    test pin 27.11.12.7.12 ?
    pin 1&2 +VIN LVDS CONN ?
    Last edited by Techtiger; 01-11-2019, 01:50 PM.

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      #3
      Re: HP 15-B142DX No image

      Originally posted by techtiger View Post
      for the U21 pin 3 should get PCH DISP ON signel to +3V to transfer +LCDVCC +3VLCD CON L3 coil
      test Pin 16&15 for resistance to GND
      test pin 27.11.12.7.12 ?
      pin 1&2 +VIN LVDS CONN ?
      U16 resistance to ground pin 16 .0680
      U16 resistance to ground pin 15 .0564
      U16 resistance to ground pin 14 .0587

      Pin 7 ---> 1.17V
      Pin 8 ----> 1.19V
      Pin 11 ---> 1.17V
      Pin 12 ----> 1.18V
      Pin 27 ----> 1.17V

      pin 1&2 +VIN LVDS CONN ---->19V

      Comment


        #4
        Re: HP 15-B142DX No image

        If you put a jumper U1 pin5 to pin1 you can transfer +3.3V to +LCDVCC +3VLCD CON L3 coil it might work it’s up to you
        ( remove the nap and test weather voltage get’s for the pins)
        Or change U16
        Last edited by Techtiger; 01-12-2019, 07:59 AM.

        Comment


          #5
          Re: HP 15-B142DX No image

          please help me
          i'm sorry i can't make new post ; i don't know why.
          hp dv6-3357sf quanta LX6
          no power , no light .


          Comment


            #6
            Re: HP 15-B142DX No image

            Test voltage CN15 pin1.2.3 voltage
            PQ42 Gate should be High it's a N-Channel Mosfet to by pass voltage to Source 0V no power
            PU5 pin 1 & 9 Voltage ?
            uplode your Schematic
            Last edited by Techtiger; 01-12-2019, 09:29 AM.

            Comment


              #7
              Re: HP 15-B142DX No image

              Originally posted by mo000 View Post
              please help me
              i'm sorry i can't make new post ; i don't know why.
              hp dv6-3357sf quanta LX6
              no power , no light .
              Good Idea to make your own thread.

              If I remember correctly, new account should be wait 24 hour till can make thread, also when it is the first time your post.....

              Maybe just explore this forum to know rule make new thread.

              Comment


                #8
                Re: HP 15-B142DX No image

                On/OFF thanks for the Schematic

                Comment


                  #9
                  Re: HP 15-B142DX No image

                  .
                  Last edited by mo000; 01-12-2019, 11:15 AM.

                  Comment


                    #10
                    Re: HP 15-B142DX No image

                    Originally posted by on/off View Post
                    Good Idea to make your own thread.

                    If I remember correctly, new account should be wait 24 hour till can make thread, also when it is the first time your post.....

                    Maybe just explore this forum to know rule make new thread.
                    but i'm not new member .

                    Comment


                      #11
                      Re: HP 15-B142DX No image

                      .
                      Last edited by mo000; 01-12-2019, 11:16 AM.

                      Comment


                        #12
                        Re: HP 15-B142DX No image

                        I will try to make a jumper first also i found that L3 is missing can i make a jumper for L3 or must replace?

                        Thanks
                        Last edited by eniac22; 01-12-2019, 10:42 AM.

                        Comment


                          #13
                          Re: HP 15-B142DX No image

                          Originally posted by eniac22 View Post
                          I will try to make a jumper first also i found that L3 is missing can i make a jumper for L3 or must replace?

                          Thanks
                          What do you mean it's follen Down or it's Originally not there?

                          Comment


                            #14
                            Re: HP 15-B142DX No image

                            .

                            Comment


                              #15
                              Re: HP 15-B142DX No image

                              Originally posted by techtiger View Post
                              What do you mean it's follen Down or it's Originally not there?
                              Follen down

                              Comment


                                #16
                                Re: HP 15-B142DX No image

                                Originally posted by eniac22 View Post
                                Follen down
                                Ok then replace it

                                Comment


                                  #17
                                  Re: HP 15-B142DX No image

                                  Originally posted by techtiger View Post
                                  Ok then replace it
                                  I can't find exact smd part, can i replaced with this https://www.arrow.com/en/products/ci...ctro-mechanics
                                  is the same but the Max Rated Current is 2.5A instead 3.Α

                                  Thanks for your help

                                  Comment

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