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820-3435-B kb and T/P are not working.

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  • 820-3435-B kb and T/P are not working.

    820-3435-B kb and T/P not woirking.
    It was water damaged.Did ultrasonic cleaning, check with good known
    all cables and i/o card but no luck.

    compare with good known mb Diode mode measurement all are good, except J4800 pin2 is .441 but the
    good one mb show me OL. So i checked R4850=33 OHM , looks good and R1666=25k but it should be 47k
    i replaced this but still it shows me 25k,

    p1 smc lid=3.3v
    p10=3.3v
    p14=5.1v
    p19=3.3v
    Now i stuck, dont knoe what the next i should check. Any help please.

  • #2
    Check first if you can access boot menu.

    "R1666=25k but it should be 47k
    i replaced this but still it shows me 25k,"
    Onboard mesurement for rsistance depends by other resistors/components connected in the same lines.

    "J4800 pin2 is .441 but the
    good one mb show me OL"
    Checked with red probe to ground on both cases?

    Post diode mode value (red to ground) for pin 2/6 of U4810.
    Check all resistors R4850-53 from TPAD SPI lines.

    Where was the spill?
    Check continuity from J4800 to other components.

    Comment


    • #3
      I found missing R4844, replase it now t/p working fine with the following measurement
      U4810 (diode mode ) p2=.509 and p6=.432.
      Still i see j4800 p2=.441 and it should be OL compare to good one. and my battery is not detected.
      I tried two battery. All other functions of the mac are working except Battery. Any suggestions please.

      Comment


      • #4
        Post SCL/SDA diode mode values on battery bus.

        Comment


        • #5
          SCL=.476 and SDA=.475

          Comment


          • #6
            Values are correct.
            Post PPBUS_G3H voltage w/ and w/o battery connected.

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            • #7
              PPBUS_G3H voltage w/ = 8.57v
              and w/o battery connected=8.57v

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              • #8
                Unless battery is 100% charged, PPBUS_G3H should have lower value when battery is connected.

                Run ASD, let see if any error appears...

                Comment


                • #9
                  Now i stuck, i don't have ASD for Macbook air 11 2014, A1465, any body can help me please.
                  Last edited by Dewanbd; 11-30-2018, 08:34 PM.

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                  • #10
                    Is there any ASD for Macbook Air 11 2014, A1465 available?

                    Comment


                    • #11
                      No idea really, never used for this model.
                      Did you change ISL6259?
                      Check voltage on A/BMON of it; both battery and charger connected.
                      Also check exact resistance between pins 17/18 and 27/28.

                      Comment


                      • #12
                        Thanks for replying.
                        No, i dint change ISL.
                        voltage on AMON p9= .171 ( only charger connected )
                        voltage on BMON p15= .172 ( only charger connected )

                        voltage on AMON p9= .172 ( battery connected )
                        voltage on BMON p15= .104 ( battery connected )

                        resistance between pins 17/18= 2.4 ohm
                        resistance between pins 27/28=20 ohm

                        Comment


                        • #13
                          Can you see any communication on SCL/SDA lines of battery bus.
                          I think is time to change the SMC...

                          Comment


                          • #14
                            All communication on SCL/SDA lines of battery bus are good.

                            Comment


                            • #15
                              Check if R6950 is OK.
                              Battery connector was affected by spill too?

                              Comment

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