Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

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  • magneh
    Badcaps Veteran
    • Apr 2014
    • 588
    • Portugal

    #1

    Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

    Hello!

    I have this laptop on my bench, dead no power, no leds.
    Checked the MB , and found 2 burned components with a hole on them, KBC and battery charger IC PU301 (BQ24781)
    No liquid damage.
    Replaced both components, still no power.

    Found that +3VLP_EC is oscillating and +19VB same thing.
    When I open JP2 to isolate, +3VLP is 3.3V and +19VB is 19V stable
    No short in +3VLP_EC and all KBC pins measure ok. no shorts

    I hear a clicking sound ,think it comes from the chipset, and this clicking sound is cycling matching the cycling consummation on the PSU, 2-3mA, 25mA,2-3mA and so on. Sometimes I see CC light blinking shortly.

    Measured caps on the chipset, all values seem OK, nothing shorted.
    Same thing around the chipset itself, all values seem OK, no shorted lines.

    All coils OK, no shorts found also.
    No voltages present, except in PL301 I have 0.21V (battery coil)

    What do you guys think? Bad chipset?
    Any other test or measurements I could do to confirm this?

    KBC chip was not programmed, but I suppose if that was the issue, +3VEC would still be stable.

    Let me know if you have other suggestions for this case.
    Thank you!
    Attached Files
    Last edited by magneh; 03-16-2021, 09:52 AM.
  • piernov
    Super Moderator
    • Jan 2016
    • 4435
    • France

    #2
    Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

    Known good AC adapter of correct power rating?
    If yes measure exact resistance to ground on all the large inductors.
    OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

    Comment

    • SMDFlea
      Super Moderator
      • Jan 2018
      • 20709
      • UK

      #3
      Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

      Press SW2 in .
      All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

      Comment

      • magneh
        Badcaps Veteran
        • Apr 2014
        • 588
        • Portugal

        #4
        Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

        Originally posted by piernov
        Known good AC adapter of correct power rating?
        If yes measure exact resistance to ground on all the large inductors.
        Salut Piernov.

        using my bench power supply
        No shorts in any inductors.

        Comment

        • magneh
          Badcaps Veteran
          • Apr 2014
          • 588
          • Portugal

          #5
          Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

          Originally posted by SMDFlea
          Press SW2 in .
          Nothing changes.
          Battery is not plugged in for info

          Comment

          • khaahk
            Badcaps Veteran
            • Dec 2013
            • 759
            • Estonia

            #6
            Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

            Resistances after UQ1 at J5 and J6?

            Comment

            • SMDFlea
              Super Moderator
              • Jan 2018
              • 20709
              • UK

              #7
              Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

              Can you remove UL1 and RL2 then check if +3VLP_EC is stable with JP2 soldered.
              All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

              Comment

              • magneh
                Badcaps Veteran
                • Apr 2014
                • 588
                • Portugal

                #8
                Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                Originally posted by khaahk
                Resistances after UQ1 at J5 and J6?
                Hello!

                So here's the resistance I have.

                J5 - 12.3k ohm
                J6 - 490k ohm

                Comment

                • khaahk
                  Badcaps Veteran
                  • Dec 2013
                  • 759
                  • Estonia

                  #9
                  Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                  Originally posted by magneh
                  Hello!

                  So here's the resistance I have.

                  J5 - 12.3k ohm
                  J6 - 490k ohm
                  Seems fine.

                  Does the SMPS part of the 3v and 5v try to start? Do you see some activity on PL402, PL404? If you have, use an oscilloscope.

                  Comment

                  • magneh
                    Badcaps Veteran
                    • Apr 2014
                    • 588
                    • Portugal

                    #10
                    Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                    Originally posted by SMDFlea
                    Can you remove UL1 and RL2 then check if +3VLP_EC is stable with JP2 soldered.
                    UL1 is no stuff
                    Removed RL2 and +3VLP_EC is still flickering 0-2V something like this.too fast to catch on multimeter.

                    Comment

                    • magneh
                      Badcaps Veteran
                      • Apr 2014
                      • 588
                      • Portugal

                      #11
                      Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                      Originally posted by khaahk
                      Seems fine.

                      Does the SMPS part of the 3v and 5v try to start? Do you see some activity on PL402, PL404? If you have, use an oscilloscope.
                      No,nothing I can see with the multimeter.

                      SIO is not releasing the Enables for 3v and 5v, as the +3VLP_EC line that powers up the SIO is not stable...

                      this is what I could understand so far...just not seeing what could cause this...probably the chipset, but not sure

                      Comment

                      • SMDFlea
                        Super Moderator
                        • Jan 2018
                        • 20709
                        • UK

                        #12
                        Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                        Originally posted by magneh
                        UL1 is no stuff
                        Removed RL2 and +3VLP_EC is still flickering 0-2V something like this.too fast to catch on multimeter.
                        Yes UL1 is no stuff .Ok remove LB1 and check +3VLP_EC again
                        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                        Comment

                        • magneh
                          Badcaps Veteran
                          • Apr 2014
                          • 588
                          • Portugal

                          #13
                          Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                          Originally posted by SMDFlea
                          Yes UL1 is no stuff .Ok remove LB1 and check +3VLP_EC again


                          Still the same after removing LB1

                          Comment

                          • khaahk
                            Badcaps Veteran
                            • Dec 2013
                            • 759
                            • Estonia

                            #14
                            Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                            Originally posted by magneh
                            No,nothing I can see with the multimeter.

                            SIO is not releasing the Enables for 3v and 5v, as the +3VLP_EC line that powers up the SIO is not stable...

                            this is what I could understand so far...just not seeing what could cause this...probably the chipset, but not sure
                            It might be happening so fast that it is impossible to catch with multimeter.

                            Just in case check for low resistance on RTCVCC on DH3

                            Comment

                            • SMDFlea
                              Super Moderator
                              • Jan 2018
                              • 20709
                              • UK

                              #15
                              Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                              Check RB1,if thats ok i`m out of ideas
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                              Comment

                              • magneh
                                Badcaps Veteran
                                • Apr 2014
                                • 588
                                • Portugal

                                #16
                                Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                                Originally posted by khaahk
                                It might be happening so fast that it is impossible to catch with multimeter.

                                Just in case check for low resistance on RTCVCC on DH3
                                Very high resistance. 0.5 in diode mode

                                Comment

                                • magneh
                                  Badcaps Veteran
                                  • Apr 2014
                                  • 588
                                  • Portugal

                                  #17
                                  Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                                  Originally posted by SMDFlea
                                  Check RB1,if thats ok i`m out of ideas
                                  Yeah Im getting 75k so should be fine.

                                  Guess I cant also not figure this one out

                                  Comment

                                  • SMDFlea
                                    Super Moderator
                                    • Jan 2018
                                    • 20709
                                    • UK

                                    #18
                                    Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                                    Its 100K in the schematic 100K_0402_1%
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                                    Comment

                                    • magneh
                                      Badcaps Veteran
                                      • Apr 2014
                                      • 588
                                      • Portugal

                                      #19
                                      Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                                      yeah but measured in circuit,so I believe if i remove and mesure it will be 100k

                                      Comment

                                      • SMDFlea
                                        Super Moderator
                                        • Jan 2018
                                        • 20709
                                        • UK

                                        #20
                                        Re: Nitro 5 AN515-51 - Burned KBC and regulator - LA-911P

                                        Originally posted by magneh
                                        yeah but measured in circuit,so I believe if i remove and mesure it will be 100k
                                        Yes maybe. Are you sure theres no bridged pins on the SIO .Check for corrosion or liquid damage on RB13 and JHS1 pin 2 LID_SW#
                                        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

                                        Comment

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