Announcement

Collapse
No announcement yet.

Macbook 820-3115 missing 3V42_G3H

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    #81
    Re: Macbook 820-3115 missing 3V42_G3H

    Pin 10 = 0.7 ohms to ground ?

    To me, U7600 is defective.

    Comment


      #82
      Re: Macbook 820-3115 missing 3V42_G3H

      Removed U7600 the part itself was reading 10,8Mohms on Pin 10.
      On the logicboard Pin 10 is at 1 Ohms.

      Comment


        #83
        Re: Macbook 820-3115 missing 3V42_G3H

        So with U7600 removed, pin 10 on the logic board is ~1 ohms to ground ?

        What is left on the logic board that is mating with pin # 10 pad of U7600 on the logic board ?

        Someone is causing this rail to sink.

        Is L7630 still onboard or on a single leg ?

        Comment


          #84
          Re: Macbook 820-3115 missing 3V42_G3H

          Yes L7630 is still completely onboard.
          C7630 is mating with pin 10.
          Last edited by Nuld_; 07-02-2022, 11:27 AM.

          Comment


            #85
            Re: Macbook 820-3115 missing 3V42_G3H

            Lift up one leg of L7630 OR remove current sense resistor R7640 (may be easier). Will need patience and flux to heat up this area since the inductor is able to support 20A of current. If indeed it is the inductor then this leads to the CPU which I believe will be the CPU causing this short event. Confirm it.

            Comment


              #86
              Re: Macbook 820-3115 missing 3V42_G3H

              I´ve removed R7640, the readings on the board are:

              Pin 1: O.L
              Pin 2: 0,7 Ohms
              Pin 3: O.L
              Pin 4: O.L

              Comment


                #87
                Re: Macbook 820-3115 missing 3V42_G3H

                Not at my computer but pin #2 is towards the CPU ?

                The CPU appears to be shorted. Wait on advice from others but CPU is very likely damaged from this reading.

                Comment


                  #88
                  Re: Macbook 820-3115 missing 3V42_G3H

                  Yup it is towards the CPU, I guess I will have to focus now on the other defective Logic Board. Nevertheless thanks a lot for your help

                  Comment

                  Working...
                  X