Lenovo G560 works on battery only

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  • protools_operator
    New Member
    • May 2011
    • 3
    #1

    Lenovo G560 works on battery only

    Hi everyone this is my first post but i gathered a lot of information in time from this amazing forum.

    I'm trying to fix a faulty mainboard of an IdeaPad G560. It was coffee-damaged and the keyboard didn't functioning good. After replacing it I noticed that the G560 works only on battery.

    What should I check for? where do I start?
    The battrey is not charging nor DC connected without battery doesn't power computer.

    I cleaned all the corrosion ofcourse.
    Laptop gets DC voltage correct until the motherboard so it's not the DC jack cable.

    Battery pins get's very low voltage (about 0.4).
    I don't know where to continue, it seems like the G560 doesn't recognize that it is connected to DC.

    When the DC is connected and the battery doesn't there is a low volume noise when that I hear coming from the motherboard while it's off ofcourse and HD disconnected. Also there is a low volume noise from the Ac/DC adapter. When I connect the battery and the DC is in there isn't any noise like this.

    Would like some help.

    I own a soldering station for SMD and also a rework station.
    Tags: None
    • gabik111
      ORD spotter
      • Apr 2011
      • 142
      • USA / Poland
      #2
      Re: Lenovo G560 works on battery only

      Better way is to remove it apart and check mobo for any corrosion with magnifying glass (micro cracks or bad solder points) in power supply section. Maybe some mosfet transistor(s) is bad and needs to be replaced.
      Laptops and computers repair.

        Comment

        • protools_operator
          New Member
          • May 2011
          • 3
          #3
          Re: Lenovo G560 works on battery only

          Thank you for the quick answer gabi.
          I must say that I used to study electronics back in highschool and I know the basics but I'm not a pro.
          I really appreciate any help and I think it's a great forum.

          I cleaned the power section again with anti corrosion liquid.
          I tried to measure resistance in the power section mosfets, all the mosfets seems fine except one that i'm not sure about it, it measures gate to source - 197KOHM, source to gate - 0.200MOHM, drain to gate doesn't show any reading and when measuring drain to source I get 186KOHM after waiting that the resistence will be stable (going from about 177KOHM one 0.1KOHM at a time until gets to 186KOHM.

          :EDIT: I checked closely and I saw that between the source and the gate there is a capacitor so it may not be the problem.

          I checked the battery leads it is:
          GND GND POSITIVE POSITIVE POSITIVE (PLASTIC) POSITIVE POSITIVE.
          The 2 POSITIVE in the most right shows stable 8VDC when connected to the DC JACK.
          THE OTHER 3 POSITIVES shows a reading that changes every second between 1~ and 2~ VDC.

          also I checked the power chip (RT8206B) for voltage from the VOUT-3.3V and VOUT-5V and it was unstable.
          what am I missing here?
          Thanks,
          -Noam

            Comment

            • protools_operator
              New Member
              • May 2011
              • 3
              #4
              Re: Lenovo G560 works on battery only

              Anyone has experience with this problem?
              Thanks,
              I wait only for answers from the forum before I touch the laptop again
              Hope to get any idea

                Comment

                • ferryvanhot
                  New Member
                  • Aug 2011
                  • 7
                  #5
                  Re: Lenovo G560 works on battery only

                  Originally posted by protools_operator
                  Anyone has experience with this problem?
                  Thanks,
                  I wait only for answers from the forum before I touch the laptop again
                  Hope to get any idea
                  is the problem solved??

                    Comment

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