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[SOLVED]820-3115 - f6905

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  • [SOLVED]820-3115 - f6905

    Guys,

    I get in F6905 0.45 - 0.59 . 0.89v
    The fuse is ok.
    I replaced twice the magsafe and charger and i still don't get 16v.

    Any advice?

  • #2
    Try with a fake chinese charger, the Apple one is shutting down because of an over current issue.

    Comment


    • menatwork
      menatwork commented
      Editing a comment
      I tried and right now i get 2.78v and drop to 0. Also, the magsafe get warm

  • #3
    what is resistance to ground on PPDCIN_G3H?

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    • #4
      Ppdcin_g3h (r6990) 38.6k‎ω

      Comment


      • #5
        dukefawks I tried and right now i get 2.78v and drop to 0. Also, the magsafe get warm


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        • #6
          Well then there is obviously a short. Is there a short on R7020 to GND or on L7030?

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          • #7
            dukefawks You are right! I replaced R7020 and i get green light, but Q7085 get VERY HOT! I replaced twice and keep get warm.

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            • #8
              Why would you replace R7020?
              I asked if there was a short to GND there, also check short the GND on C7087.

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              • #9
                Yes, have short to ground, that's why i replaced. I get green light after that.
                I just check C7087 short to ground and i get 12.89 m ohm.

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                • #10
                  I get on R7085 467 M ohm, but the schematics said 470K

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                  • #11
                    Q7085
                    Pin 4: 8.44v
                    Pin 3-2-1: 17v

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                    • #12
                      Please for the love of God go and figure out how to use a multimeter. 12.89mOhm is milli Ohm. 467M Ohm on R7085 is MEGA OHM. This all makes no sense at all AGAIN.
                      Also if there is a short to GND how would R7020 be responsible for that, it is just impossible.
                      I cannot diagnose your issues if you have no clue what you are measuring or doing, sorry.

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                      • #13
                        I fixed!

                        Comp. Replaced:
                        1 - R7020
                        2 - Q7085
                        3 - C7030
                        4 - C7031

                        I will buy a new Multimeter

                        Thanks dukefawks larossmann

                        Comment


                        • #14
                          It was of course a shorted C7030 or C7031.
                          The multimeter is not the problem, interpreting the reading is the problem.

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