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820-2915, slow battery charging

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  • 820-2915, slow battery charging

    820-2914-B, it has some issue with charging,
    when I plug the MagSafe it charges the battery consuming 2.9A directly after it decreases the amper consumption to 1.2A
    I think it has an issue with the Amperomter sensor after it charges the battery slowly.

    u7000 replaced
    battery SDA/SCL 0.530 diode mode/ 3.4V


    who to start this troubleshooting?

  • #2
    Is your board 2914, or 2915?
    Did you try known good battery?
    Original Magsafe 1 85W charger?

    Comment


    • #3
      I'm not an expert, but from my experience this is usually caused by a bad aftermarket battery. Change U7000 and Q7055 at once and never connect that bad battery again.

      Comment


      • #4
        Sorry for being late on this..
        it is 2915
        Resistance between pin 19/20 9.2omh
        27/28 26ohm

        I didn't replace u7000, it is a new board but it has the same issue.

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        • #5
          Try KNOWN GOOD battery, as you can waste time for nothing...

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          • #6
            I tested a good battery the same problem, it charge the battery with 0.5amp

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            • #7
              When battery voltage increases, charging current decreases, this is normal behaviour.
              Can you fully charge the battery?

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              • #8
                the battery voltage 10.8v
                it shows on the system 8%

                I put this battery on other known good board it charges with 2.5amp.

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                • #9
                  For such low level yes, should charge with high current.
                  I was thinking you had battery almost full...

                  Check SMC_DCIN/BMON_ISENSE levels.

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                  • #10
                    SMC_DCIN_ISENSE 0.3v oscillate to 1v
                    BMON_ISENSE 3v

                    the battery level about 50%

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                    • #11
                      "BMON_ISENSE 3v"
                      There is your problem!

                      Post CHGR_BMON level and check resistance between pins 17/18 of ISL6259.

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                      • #12
                        CHGR_BMON 0v05v
                        resistance between 17/18 2.8ohm
                        Last edited by yobad; 2 weeks ago.

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                        • #13
                          Check R5420/22 and traces...

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                          • #14
                            100% Q7055, you will find it is shorted right now.

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                            • #15
                              Yes I found a broken trace on the R5422 and I repaired it
                              Q7055 replaced also but I didn't found a short in it
                              thanks for help

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