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820-2530 battery issues

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  • 820-2530 battery issues

    this board has been worked on by someone else before, U7000 looks newer and they put a resistor between c7041and c7040

    magsafe green light comes on, but won't charge (no PPBUS_g3H) unless i hook up a charged battery, then will actually power on. but won't power on with battery only
    all current sense resistors look ok

    i get 20ish ohms resistance between pins 17/18 and 27/28 on U7000

    adapter sense is 3.3V but looks like something keeps trying to pull it down to 3.15 when I check SMC_BC_ACOK on U6900 and U6901

    is it the ISL or something else?

  • #2
    Check if there is actually a 6258 on there on not a 6259. Resistor between C7040/41 is R7040 I guess? If that all is ok then replace U7000

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    • #3
      R7040 is still there also
      is a 6258AHRTZ

      i assume the ISL rework and everything was working until a shitty charger did something to bring it to where it is now

      could the ISL gotten fried and everything else be fine?

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      • #4
        Yes that is of course possible. Check R7040 value against the schematic. Also check R7005

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        • #5
          replaced the ISL and now it's running off of AC but still no battery, everything else looks fine any ideas?

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          • #6
            Battery recognized in OSX?

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            • #7
              nope, doesn't see battery and BIL doesn't light up

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              • #8
                maybe too much heat/time on ISL when I was putting it down? Do you think I should try another one?

                pins 17/18 still giving 21.1k resistance

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                • #9
                  Dead SMC...

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                  • #10
                    even though it can run off of batt after i start it on AC? damn so close

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                    • #11
                      Replace it from donor board.

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                      • #12
                        don't have a BGA machine

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                        • #13
                          Dont need BGA machine, it is a small chip ..... Use your hot air station and preheater if you have, hot air station is enough if you don't have preheater, practice in donor boards first ....

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