Lenovo G50-80 i think Have no power...

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  • lorins_core
    BlackSmith
    • Dec 2012
    • 551
    • Philippines

    #1

    Lenovo G50-80 i think Have no power...

    Have a Nice to all

    I have Lenovo G50-80
    Mobo pn: Aclu3/Aclu4 NM-A361

    *Laptop Unit Status: if you plug the Charger Adapter. indicating power on status Light. i press the power Switch long Turn of then on the Light Again.

    *Before the unit before came in my technical Area. i pressing the power button unit turn on then light on indicator after 3 or 5 sec turn off?

    I decide dismantle the laptop unit. inspected first Check for water spilled negative on corroded mobo is clean. check the voltage from dc in. 20.2V.
    to fuse 20.3 on all rail.

    check on PQ301
    123 - 20.3V
    4 - 5V? i i have question for this. it is Voltage Drop?
    5678 - 20.3V
    I check the Mosfet. Mosfet is Good

    check on PQ302
    123 - 20.3V
    4 - 5V
    5678 - 20.2V
    Also This Mosfet is Good


    check ic - PU301
    1. 20.3V
    2. 20.3V
    3. 0V
    4. 1.6V
    5. 0V
    6. 2.6V
    7. 0V
    8. 3.3V
    9. 3.3V
    10. 00.8V
    11. 1.5V
    12. 1.8V
    13. 1.8V
    14. 0V
    15. 0V
    16. 5.9V
    17. 5.8V
    18. 1.8V
    19. 1.8V
    20. 20.3V

    try to change this IC. same Prod Code BQ737
    Same. Problem nothing Happen

    then i Check
    PQ303
    123 - 20.3V
    4 - 20.1V
    5678 -1.8V


    other i Check the Always... 3.3VALW & 5VALW.

    Which parts are Faulty?

    Need to your Advice.
    TIA.
  • Techtiger
    Badcaps Legend
    • Oct 2014
    • 1601
    • france

    #2
    Re: Lenovo G50-80 i think Have no power...

    Originally posted by lorins_core
    Have a Nice to all

    I have Lenovo G50-80
    Mobo pn: Aclu3/Aclu4 NM-A361

    *Laptop Unit Status: if you plug the Charger Adapter. indicating power on status Light. i press the power Switch long Turn of then on the Light Again.

    *Before the unit before came in my technical Area. i pressing the power button unit turn on then light on indicator after 3 or 5 sec turn off?

    I decide dismantle the laptop unit. inspected first Check for water spilled negative on corroded mobo is clean. check the voltage from dc in. 20.2V.
    to fuse 20.3 on all rail.

    check on PQ301
    123 - 20.3V
    4 - 5V? i i have question for this. it is Voltage Drop?
    5678 - 20.3V
    I check the Mosfet. Mosfet is Good

    check on PQ302
    123 - 20.3V
    4 - 5V
    5678 - 20.2V
    Also This Mosfet is Good
    First 2 Fets are good pin 4- 5V is the gate pass to bypass Voltage it's a P-Channel fet

    Comment

    • Techtiger
      Badcaps Legend
      • Oct 2014
      • 1601
      • france

      #3
      Re: Lenovo G50-80 i think Have no power...

      PU301 pin 5 ACOK voltage is not correct 3.3V SIO is not detecting presence of ACOK signal trace it back test pic all components
      Attached Files
      Last edited by Techtiger; 04-10-2019, 07:39 AM.

      Comment

      • ktmmotocross
        Boardkiller
        • Feb 2014
        • 3582
        • slovakia

        #4
        Re: Lenovo G50-80 i think Have no power...

        as first flash bios. this model was well know for this fault

        Comment

        • lorins_core
          BlackSmith
          • Dec 2012
          • 551
          • Philippines

          #5
          Re: Lenovo G50-80 i think Have no power...

          Originally posted by ktmmotocross
          as first flash bios. this model was well know for this fault
          i Flash the bios. still same problem.

          I confuse why if i Plug the charger adapter automatic the light indicator has been light up? also i observe the battery pack installed 2 indicator light up and why not showing the orange light? only 2 white led only.

          Comment

          • lorins_core
            BlackSmith
            • Dec 2012
            • 551
            • Philippines

            #6
            Re: Lenovo G50-80 i think Have no power...

            Originally posted by techtiger
            PU301 pin 5 ACOK voltage is not correct 3.3V SIO is not detecting presence of ACOK signal trace it back test pic all components
            thanks you. I will try Later

            Comment

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