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HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

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    HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

    Hi everyone....

    please i need help; I have an HP Elitebook Folio 1040 g3 which was damaged by water.... I've replaced the 5VPCU regulator IC [Power IC] which shorted out due to the water damage.

    Now, it turns on, blinks the capslock/numlock light 5 times then restarts and repeats the blink process again and does that continuously.

    According to HP site, the 5 blinks is a System Board Failure.

    Who has any idea on how it can be fixed should PLEASE help out... No component on the board has labels, so it is hard to trace using Schematics

    [MOD EDIT] Link to schematic - https://www.badcaps.net/forum/troubl...-y0f-schematic

    #2
    Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

    What are the missing voltage on the coils ? Is your +3/5/1.8VPCU are fine? Follow the page 67 power block & update what are the missing voltage

    Comment


      #3
      Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

      Originally posted by techtiger View Post
      What are the missing voltage on the coils ? Is your +3/5/1.8VPCU are fine? Follow the page 67 power block & update what are the missing voltage
      Okay, thanks for the prompt reply, +3/5/1.8VPCU are okay...

      only 2 coils have missing voltages
      Attached Files

      Comment


        #4
        Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

        Originally posted by classicandy View Post
        Okay, thanks for the prompt reply, +3/5/1.8VPCU are okay...

        only 2 coils have missing voltages
        what is the PL number PL40 29

        Comment


          #5
          Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

          Originally posted by techtiger View Post
          what is the PL number PL40 29

          It is not labelled on the board. Lemme try to trace it using the schematics

          Comment


            #6
            Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

            Originally posted by techtiger View Post
            what is the PL number PL40 29
            Coils PL36 and PL38 have NO volts (0v).

            Which makes +VCC_GT absent

            Comment


              #7
              Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

              Originally posted by classicandy View Post
              Coils PL36 and PL38 have NO volts (0v).

              Which makes +VCC_GT absent
              check the Resistence to GND on PL38/36 , remove PL12 & power the MB to see if it's power up , check PQ16/17 check PU16/17 for any short & voltage of all pins PU16/17 ?

              Comment


                #8
                Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                Originally posted by techtiger View Post
                check the Resistence to GND on PL38/36 , remove PL12 & power the MB to see if it's power up , check PQ16/17 check PU16/17 for any short & voltage of all pins PU16/17 ?
                Resistance to ground on PL36/38 = 4.6 ohms

                Without PL12, the problem is still the same, 5 blinks .....

                Comment


                  #9
                  Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                  Originally posted by techtiger View Post
                  check the Resistence to GND on PL38/36 , remove PL12 & power the MB to see if it's power up , check PQ16/17 check PU16/17 for any short & voltage of all pins PU16/17 ?
                  No shorts found so far.......

                  PQ16/17 ....... okay

                  PU16
                  Pin 1 = 10.70 [Vin]
                  Pin 2 = 0v [GND]
                  Pin 3 = 1.3v [suspicious]
                  Pin 4 = 0v [NC]
                  Pin 5 = 5.12v
                  Pin 6 = 5.12v
                  Pin 7 = 5.12v
                  Pin 8 = 8.53v
                  Pin 9 = 3.53v
                  Pin 10 = 0v
                  Pin 11 = 2.43v
                  Pin 12 = 4.5v

                  PU24
                  Pin 13 = 0v [1V8A_PG]........

                  Comment


                    #10
                    Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                    Originally posted by classicandy View Post
                    No shorts found so far.......

                    PQ16/17 ....... okay

                    PU16
                    Pin 1 = 10.70 [Vin]
                    Pin 2 = 0v [GND]
                    Pin 3 = 1.3v [suspicious]
                    Pin 4 = 0v [NC]
                    Pin 5 = 5.12v
                    Pin 6 = 5.12v
                    Pin 7 = 5.12v
                    Pin 8 = 8.53v
                    Pin 9 = 3.53v
                    Pin 10 = 0v
                    Pin 11 = 2.43v
                    Pin 12 = 4.5v

                    PU24
                    Pin 13 = 0v [1V8A_PG]........
                    check DRVON on EN on PU22 than live is ok for me ! pin 2 is not GND PWM1_2ph so test again Ohms , PIN 6 is GND so check again
                    Last edited by Techtiger; 09-25-2020, 03:25 AM.

                    Comment


                      #11
                      Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                      Originally posted by classicandy View Post
                      Resistance to ground on PL36/38 = 4.6 ohms

                      Without PL12, the problem is still the same, 5 blinks .....
                      4.6ohms quite ok since it's CPU SOC , what is the voltage on PU21 pin 13 8 ? PU5 pin 8 ?

                      Comment


                        #12
                        Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                        Originally posted by techtiger View Post
                        check DRVON on EN on PU22 than live is ok for me ! pin 2 is not GND PWM1_2ph so test again Ohms , PIN 6 is GND so check again
                        Those readings are for PU16. Pin 2 of PU16 is PGND while Pin 2 of PU17 is PWM1_2ph

                        Comment


                          #13
                          Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                          PU17/18 Readings:

                          Pin 1 = 5.0v
                          Pin 2 = 2.0v
                          Pin 3 = 4.9v
                          Pin 4 = 5.12v
                          Pin 5 = 0v
                          Pin 6 = 0v
                          Pin 7 = 0v
                          Pin 8 = 0v

                          Comment


                            #14
                            Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                            Originally posted by techtiger View Post
                            check DRVON on EN on PU22 than live is ok for me ! pin 2 is not GND PWM1_2ph so test again Ohms , PIN 6 is GND so check again
                            PU22 Readings:
                            Pin 1 = 5.89v
                            Pin 2 = 0.53v
                            Pin 3 = 4.9v [DRVON_EN]
                            Pin 4 = 5.12v
                            Pin 5 = 4.47v
                            Pin 6 = 0v
                            Pin 7 = 1.05v
                            Pin 8 = 1.50v

                            Comment


                              #15
                              Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                              Originally posted by classicandy View Post
                              No shorts found so far.......

                              PQ16/17 ....... okay

                              PU16
                              Pin 1 = 10.70 [Vin]
                              Pin 2 = 0v [GND]
                              Pin 3 = 1.3v [suspicious]
                              Pin 4 = 0v [NC]
                              Pin 5 = 5.12v
                              Pin 6 = 5.12v
                              Pin 7 = 5.12v
                              Pin 8 = 8.53v
                              Pin 9 = 3.53v
                              Pin 10 = 0v
                              Pin 11 = 2.43v
                              Pin 12 = 4.5v

                              PU24
                              Pin 13 = 0v [1V8A_PG]........
                              Yep PG is your problem how did miss it find out PR302 PR297 PR67 PR180 for any short or leak if ok remove PR302 & see if PG is coming back

                              Comment


                                #16
                                Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                                Originally posted by techtiger View Post
                                Yep PG is your problem how did miss it find out PR302 PR297 PR67 PR180 for any short or leak if ok remove PR302 & see if PG is coming back
                                PR302 & PR297 are short pads

                                PR67 = 2.58k ohms (3.3k ohms stated in schematics)

                                After removing PR302, PG is still 1.3v. But after comparing it with another working board (1040 g1), the 1.3v seems to be okay......

                                Comment


                                  #17
                                  Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                                  Originally posted by classicandy View Post
                                  PR302 & PR297 are short pads

                                  PR67 = 2.58k ohms (3.3k ohms stated in schematics)

                                  After removing PR302, PG is still 1.3v. But after comparing it with another working board (1040 g1), the 1.3v seems to be okay......
                                  what is the voltage on PG PU14 pin3 ? on your mob & 1040 G1 ? check what are rest PG missing

                                  Comment


                                    #18
                                    Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                                    Originally posted by techtiger View Post
                                    what is the voltage on PG PU14 pin3 ? on your mob & 1040 G1 ? check what are rest PG missing
                                    PU14 Pin 3 [PG] = 3.06v [1040 g3]

                                    I haven't seen a schematic for 1040 g1. I want to try and search for a schematic of another motherboard using same power IC (3v_5v Regulator) as 1040 g1

                                    Comment


                                      #19
                                      Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                                      Thanks for your assistance so far

                                      Comment


                                        #20
                                        Re: HP Elitebook Folio 1040 g3 Capslock/Numlock 5 blinks

                                        Originally posted by techtiger View Post
                                        what is the voltage on PG PU14 pin3 ? on your mob & 1040 G1 ? check what are rest PG missing
                                        For 1040 g1, Power IC is TPS51285A. PG [Pin 7] = 3.36v

                                        Comment

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