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Lenovo g50-80 charging led flashing but laptop not switching on

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    #1

    Lenovo g50-80 charging led flashing but laptop not switching on

    I got a lenovo g50-80 that shows charging led (orange LED flashing) and when I press the power button the white LED comes on but the laptop doesn't switch on. The fan spins for 2 seconds when I press the power button then it stops. This problem started when my charging dock broke the connecting wires and i soldered these wires back but I might have mixed them. I ended up buying a new charging dock but laptop never switched on it just shows flashing orange LED when charger is connected. Could the super io be bad? I don't know how to go about diagnosing and I can't check any board view since this was my personal laptop that I was using. Please assist with where I should check (if soldering is need then don't worry about microsoldering I can solder and remove chips perfectly)
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    #2
    Connect the power adapter. Carefully measure the voltage to ground of each mosfet pin at pq301.

    Source
    Gate
    Drain

    This is the first dcin mosfet for the charger ic at PU301.

    Comment

      #3
      Originally posted by mon2 View Post
      Connect the power adapter. Carefully measure the voltage to ground of each mosfet pin at pq301.

      Source
      Gate
      Drain

      This is the first dcin mosfet for the charger ic at PU301.
      At source i am getting 20v, gate i am get 5v and drain 20v

      Comment

        #4
        This is a p-channel mosfet so this is ok. The mosfet is enabled. Next test PQ302. Same measurements.

        Then remove all power, measure the resistance to ground of the main power rail (at ACN) of PU301. No power in resistance mode checks.

        Comment

          #5
          You mean dc jack wires broke? Right?
          If so, there is a high probability od SIO goinf bad(AD_ID touched with main power rail).

          Comment

            #6
            Originally posted by mon2 View Post
            This is a p-channel mosfet so this is ok. The mosfet is enabled. Next test PQ302. Same measurements.

            Then remove all power, measure the resistance to ground of the main power rail (at ACN) of PU301. No power in resistance mode checks.
            PQ 302 is also showing 20v on source, 5v gate and 20v drain. Which pins on PU301 must I measure for resistance (it got 12pins).

            Comment

              #7
              Originally posted by mcplslg123 View Post
              You mean dc jack wires broke? Right?
              If so, there is a high probability od SIO goinf bad(AD_ID touched with main power rail).
              Yes DC jack wires broke. How can I see if super io is bad or where can I measure to be sure it's the super io

              Comment

                #8
                Originally posted by mcplslg123 View Post
                You mean dc jack wires broke? Right?
                If so, there is a high probability od SIO goinf bad(AD_ID touched with main power rail).
                Which pins of the super ion must I check to verify of its really the issue
                1 Photo

                Comment

                  #9
                  AD_ID

                  Usually, if the dc jack pin of 19V touches the central pin of dc jack(AD_ID)-sio definitely goes bad.
                  AD_ID pin from dc Jack goes to SIO and in turn it understands the rating of adapter being used.

                  So very very likely you need to Replace the SIO.

                  This SIO needs programming.

                  Comment

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