Lenovo Y50-70(no touch) power on but no display

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  • didutgendut
    Member
    • Jun 2017
    • 20
    • Indonesia

    #1

    Lenovo Y50-70(no touch) power on but no display

    hi my laptop display is dead (no image, no backlight, nothing)
    when press the power button the keyboard backlight, power light, battery light is on, no hard drive light and the fan spins for a few seconds. also i got a little heat in the heatsink (i guess the source of the heat around PU1102,PU1103,PU1104)
    i have tried replacing the ram, harddisk, external display, wiggle lcd cable, reset the power, etc but still no luck..

    is there any other sugestion ?
    here i attached the board schematic
    thanks !
    Attached Files
    Last edited by didutgendut; 07-15-2017, 10:39 PM.
  • dspok
    Badcaps Veteran
    • Jan 2014
    • 553
    • Nepal

    #2
    Re: Lenovo Y50-70(no touch) power on but no display

    First check all voltages on coils and let us know.

    Comment

    • didutgendut
      Member
      • Jun 2017
      • 20
      • Indonesia

      #3
      Re: Lenovo Y50-70(no touch) power on but no display

      should i check the voltage with or without the adapter connected ?

      Comment

      • caspian
        Badcaps Legend
        • Oct 2015
        • 1589
        • Laptop

        #4
        Re: Lenovo Y50-70(no touch) power on but no display

        connect the adapter but it would be better to remove the battery.

        Comment

        • didutgendut
          Member
          • Jun 2017
          • 20
          • Indonesia

          #5
          Re: Lenovo Y50-70(no touch) power on but no display

          here's the measurement on coils with battery disconnected and adapter connected

          PL101 20.5V
          PL102 20.5V

          PL201 2.4V
          PL202 2.4V

          PL302 2.4V

          PL401 19.9V
          PL402 3.3V
          PL404 5V

          PL501 19.9V
          PL502 0V
          PL503 19.9V

          PL702 0V
          PL701 19.9V

          PL902 0V
          PL903 0V
          PL904 0V

          PL1102 0V
          PL1103 0V
          PL1104 0V

          PL1201 0V
          PL1202 0V
          Last edited by didutgendut; 07-16-2017, 03:08 AM.

          Comment

          • caspian
            Badcaps Legend
            • Oct 2015
            • 1589
            • Laptop

            #6
            Re: Lenovo Y50-70(no touch) power on but no display

            now measure them again after pressing the power button.

            Comment

            • didutgendut
              Member
              • Jun 2017
              • 20
              • Indonesia

              #7
              Re: Lenovo Y50-70(no touch) power on but no display

              is it okay powering it on without the heatsink ? because some coils are under the heatsink and when i powered it on, i can feel warm around the heatsink
              Last edited by didutgendut; 07-16-2017, 03:11 AM.

              Comment

              • caspian
                Badcaps Legend
                • Oct 2015
                • 1589
                • Laptop

                #8
                Re: Lenovo Y50-70(no touch) power on but no display

                it is OK without heatsink but you have to measure one coil and turn it off in about 4 seconds.

                Comment

                • didutgendut
                  Member
                  • Jun 2017
                  • 20
                  • Indonesia

                  #9
                  Re: Lenovo Y50-70(no touch) power on but no display

                  here's the measurement when powered on

                  PL101 20.5V
                  PL102 20.5V

                  PL201 2.4V
                  PL202 2.4V

                  PL302 2.3V

                  PL401 19.6V
                  PL402 3.3V
                  PL404 5.1V

                  PL501 19.6V
                  PL502 1.5V
                  PL503 19.6V

                  PL702 1V
                  PL701 19.6V

                  PL902 0.9V
                  PL903 0.9V
                  PL904 0.9V

                  PL1102 1.7V
                  PL1103 1.7V
                  PL1104 1.7V

                  PL1201 5V
                  PL1202 12.2V

                  Comment

                  • caspian
                    Badcaps Legend
                    • Oct 2015
                    • 1589
                    • Laptop

                    #10
                    Re: Lenovo Y50-70(no touch) power on but no display

                    they seem fine.
                    now measure pins 100-to-115 of KB9022 after powering on.
                    be careful to turn off in 4 seconds.

                    Comment

                    • didutgendut
                      Member
                      • Jun 2017
                      • 20
                      • Indonesia

                      #11
                      Re: Lenovo Y50-70(no touch) power on but no display

                      okay im going to check KB9022 as soon as possible.
                      one question is it okay if i get a short circuit when checking those pins ? because those pins looks really close to each others, and i only have a standard multitester leads..
                      anyway thanks for helping me

                      Comment

                      • caspian
                        Badcaps Legend
                        • Oct 2015
                        • 1589
                        • Laptop

                        #12
                        Re: Lenovo Y50-70(no touch) power on but no display

                        you have to use needle leads.
                        if you use standard leads, you make a short and KB9022 may be damaged.
                        if you do not have needle leads, connect a needle to your standard lead.

                        Comment

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