HP G6-1270EC black screen

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  • DeniS182
    Badcaps Veteran
    • Jun 2014
    • 328
    • Slovakia

    #1

    HP G6-1270EC black screen

    Hi all,
    I have here this laptop water damaged little bit. After cleaning laptop turn on fan is spinning, but only black screen. And caps lock blink continuously. Then I found bad resistor near PU11, PR207 -360K. I replace it with 330K and caps lock stop blinking but still black screen only. 1.2V power rail is present, CPU and GPU heat normally, RAM voltage present. I didn't test flash bios yet, but when there is water damage I mean this is not bios problem.. and on VGA external monitor also black screen only. Any idea? Thanks.
    Attached Files
    Last edited by DeniS182; 02-20-2022, 04:40 AM.
  • Techtiger
    Badcaps Legend
    • Oct 2014
    • 1601
    • france

    #2
    Re: HP G6-1270EC black screen

    In the Ram slot Test pin 30 75 199 203 supply any missing voltage on the coils ?

    Comment

    • Techtiger
      Badcaps Legend
      • Oct 2014
      • 1601
      • france

      #3
      Re: HP G6-1270EC black screen

      After test pin 13 34 EC supply

      Comment

      • DeniS182
        Badcaps Veteran
        • Jun 2014
        • 328
        • Slovakia

        #4
        Re: HP G6-1270EC black screen

        Thanks for answer.

        30 - 0V
        75 - 1.54V
        199 - 3.3V
        203 - 0.77V

        Where to measure pin 13 34 please?

        And on all coils are voltages only on charging coil is 0.6v
        Last edited by DeniS182; 02-20-2022, 10:32 AM.

        Comment

        • Techtiger
          Badcaps Legend
          • Oct 2014
          • 1601
          • france

          #5
          Re: HP G6-1270EC black screen

          Originally posted by DeniS182
          Thanks for answer.

          30 - 0V
          75 - 1.54V
          199 - 3.3V
          203 - 0.77V

          Where to measure pin 13 34 please?

          And on all coils are voltages only on charging coil is 0.6v
          One of the most important single is missing now trace back pin 30 single to Q30 fet pin 1

          Comment

          • DeniS182
            Badcaps Veteran
            • Jun 2014
            • 328
            • Slovakia

            #6
            Re: HP G6-1270EC black screen

            sorry, but I don't understand what you mean. PIN 1 of Q30 is GND.

            Comment

            • Techtiger
              Badcaps Legend
              • Oct 2014
              • 1601
              • france

              #7
              Re: HP G6-1270EC black screen

              Originally posted by DeniS182
              sorry, but I don't understand what you mean. PIN 1 of Q30 is GND.
              Pin1 is Source CPU DRAMRST signal , what are the voltage on the Q30 pins & R374 both sides

              Comment

              • DeniS182
                Badcaps Veteran
                • Jun 2014
                • 328
                • Slovakia

                #8
                Re: HP G6-1270EC black screen

                Q30 - PIN 3 - 5V
                PIN 2 - 0V
                PIN 1 -0V-GND

                I can't find R374 in schematic/boardview.
                We have right, same schematic?

                Comment

                • Techtiger
                  Badcaps Legend
                  • Oct 2014
                  • 1601
                  • france

                  #9
                  Re: HP G6-1270EC black screen

                  Originally posted by DeniS182
                  Q30 - PIN 3 - 5V
                  PIN 2 - 0V
                  PIN 1 -0V-GND

                  I can't find R374 in schematic/boardview.
                  We have right, same schematic?
                  My mistake i was looking different Quant R check again Ram slot pin 198 126 1 for
                  pin 30 M_A_RST# comes from AMD MEMORY CHANNEL so if this voltage is missing no image fault

                  Comment

                  • DeniS182
                    Badcaps Veteran
                    • Jun 2014
                    • 328
                    • Slovakia

                    #10
                    Re: HP G6-1270EC black screen

                    It's ok and I measured pins:
                    1 - 0.77V
                    126 - 0.77V
                    198 - 1.54V
                    30 - 0V

                    So if 30 - 0V my CPU/APU is the problem?

                    Comment

                    • mcplslg123
                      Badcaps Legend
                      • Jun 2015
                      • 7262
                      • india

                      #11
                      Re: HP G6-1270EC black screen

                      Often the failure point on this mb is circled. Check the requirement of these 2 IC and see if it helps.
                      Attached Files

                      Comment

                      • mcplslg123
                        Badcaps Legend
                        • Jun 2015
                        • 7262
                        • india

                        #12
                        Re: HP G6-1270EC black screen

                        Originally posted by DeniS182
                        It's ok and I measured pins:
                        1 - 0.77V
                        126 - 0.77V
                        198 - 1.54V
                        30 - 0V

                        So if 30 - 0V my CPU/APU is the problem?
                        May or maynot be. DRAMRST# signal will not rise if apu/fch requirement are not fulfilled

                        Comment

                        • DeniS182
                          Badcaps Veteran
                          • Jun 2014
                          • 328
                          • Slovakia

                          #13
                          Re: HP G6-1270EC black screen

                          this 2 IC's looks ok, output voltage is present.. hard to find the fault

                          Comment

                          • Techtiger
                            Badcaps Legend
                            • Oct 2014
                            • 1601
                            • france

                            #14
                            Re: HP G6-1270EC black screen

                            Originally posted by DeniS182
                            this 2 IC's looks ok, output voltage is present.. hard to find the fault
                            so you get the out put voltage those 2 chips now check pin 14 SIO chip HWPG voltage is ok or not

                            Comment

                            • DeniS182
                              Badcaps Veteran
                              • Jun 2014
                              • 328
                              • Slovakia

                              #15
                              Re: HP G6-1270EC black screen

                              14 pin sio 3.3v

                              Comment

                              • Techtiger
                                Badcaps Legend
                                • Oct 2014
                                • 1601
                                • france

                                #16
                                Re: HP G6-1270EC black screen

                                what is the voltage on PL 22 is it 1.5V ? voltage on ram slot pin 116 120 200 202 ? do you try with another AMD CPU ?

                                Comment

                                • DeniS182
                                  Badcaps Veteran
                                  • Jun 2014
                                  • 328
                                  • Slovakia

                                  #17
                                  Re: HP G6-1270EC black screen

                                  PL22 - 1.1V
                                  116 - 1V
                                  120 - 0.89V
                                  200 - 3.3V
                                  202 - 3.3V

                                  And no because I found only am4400dec23hj (AMD A6-4400M) socket looks same but I mean it's not work. " 722-pin micro-PGA package. Please note that newer A-Series processors with Trinity and Richland cores fit into the socket FS1, but they won't work in it. "

                                  Comment

                                  • DeniS182
                                    Badcaps Veteran
                                    • Jun 2014
                                    • 328
                                    • Slovakia

                                    #18
                                    Re: HP G6-1270EC black screen

                                    I buy right CPU. Laptop works.
                                    Thanks all for help.

                                    Comment

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