Lenovo 305-15IBD - completely dead - no signs of life

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  • Andrzejj
    New Member
    • Dec 2016
    • 8
    • uk
    #1

    Lenovo 305-15IBD - completely dead - no signs of life

    Hi,

    I have a Lenovo 305-15IBD. It's dead.
    No power, No lights, no reaction to power button.

    I have taken a look inside and tested the DC jack. I have 20.76V on 2 pins on JDCIN1 socket on the motherboard.

    I also have exactly the same laptop but fully working. I did some measurements and the working motherboard have 3.3V and 5V on PU202 (when charger connected, before power button pressed). Dead motherboard doesn't have 3.3V and 5V on PU202.

    Could you please give me some advice on how to test/diagnose the motherboard further. I'm not sure what to do next as I'm a beginner. I would like to learn. Thank you
    Tags: None
    • diif
      Badcaps Legend
      • Feb 2014
      • 6978
      • England
      #2
      Re: Lenovo 305-15IBD - completely dead - no signs of life

      Check the voltages on the mosfets near the DC jack.

        Comment

        • Techtiger
          Badcaps Legend
          • Oct 2014
          • 1602
          • france
          #3
          Re: Lenovo 305-15IBD - completely dead - no signs of life

          Try this Schematic
          Test Pl101 Pl102 for +20V
          ADP_ID 3.3V ,AC Adepeter 90W?
          RTC Battery 3.3V
          PQ301 fet pin 5.6.7.8 +20V pin4 8.8V pin 1.2.3 +20V
          Voltage on PQ302 must be the same measurements
          Attached Files
          Last edited by Techtiger; 05-17-2019, 04:03 PM.

            Comment

            • Andrzejj
              New Member
              • Dec 2016
              • 8
              • uk
              #4
              Re: Lenovo 305-15IBD - completely dead - no signs of life

              PL101 and PL102 - 20.75V
              RTC Battery - 3.32V
              PQ301 - pin 1.2.3.5.6.7.8 - 20.75V, pin 4 - 8.79V
              PQ302 - pin 1.2.3.5.6.7.8 - 20.75V, pin 4 - 8.79V
              PQ302 - pin 1.2.3 - 20.75V, pin 4 - 20.26V, pin 5.6.7.8 - 20.69V
              ADP_ID 3.3V ,AC Adepeter 90W? - I'm not sure how to check this. AC Adapter is 65W

                Comment

                • Techtiger
                  Badcaps Legend
                  • Oct 2014
                  • 1602
                  • france
                  #5
                  Re: Lenovo 305-15IBD - completely dead - no signs of life

                  Now test 5/3ALWS Voltage page 46 Schematic PL402 PL404
                  PU401 pin5 and PU402 pin7

                    Comment

                    • Andrzejj
                      New Member
                      • Dec 2016
                      • 8
                      • uk
                      #6
                      Re: Lenovo 305-15IBD - completely dead - no signs of life

                      PL402 - 0V
                      PL404 - 0V
                      PU401 pin5 - 0V
                      PU402 pin7 - 5.19V
                      Last edited by Andrzejj; 05-20-2019, 04:26 AM.

                        Comment

                        • Techtiger
                          Badcaps Legend
                          • Oct 2014
                          • 1602
                          • france
                          #7
                          Re: Lenovo 305-15IBD - completely dead - no signs of life

                          test Voltage on PU301 pin 1 2 5 6 16 20 ?

                          desolder jumper PJ401 and test both sides of the JUMPER with the multimetre on Diode mode 1-2 jumper) ?
                          PU401 pin 5 test with the multimetre on Diode ?
                          PU401 Voltage on pin 7 8 2 ?
                          PU402 Voltgae on 1 5 8 ?
                          desolder jumper PJ402 and test both sides of the JUMPER with the multimetre on Diode mode 1-2 jumper) ?
                          Last edited by Techtiger; 05-20-2019, 08:23 AM.

                            Comment

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