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820-3209A backlight problem

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  • #16
    Exact error please?

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    • #17
      The error is
      Sensor Temperture Ts0P MLB test 1
      SMC IO FAILED

      here is a link with full size pic

      https://postimg.org/image/ng9pqkyif/
      Last edited by john; 06-29-2016, 08:48 AM.

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      • #18
        That is the sensor in the trackpad, so cable/connector are probably corroded. This has nothing to do with the battery issue though, it will make the machine run slow though.

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        • #19
          replaced the keyboard and I run the test again there was no error. It's strange. won't power on when I press the power button. when i plug the charger its powerin on even when the lid is closed. After i power on the mac with the charger I can shut it down on the power button. Also is running incredibly slow. Where should I check next? The battery is not detected but after the mac runs from battery if I disconnect the charger
          Last edited by john; 07-15-2016, 05:36 PM.

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          • #20
            It will run slow if battery is not recognized. You have a dead SMC/ISL6259 or a dead battery.

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            • #21
              I replaced the SMC and I end up without video. I started from the top again:
              PPBUS_G3H 8.16v
              PPBUS_S5_HS_OTHER_ISNS 8.16v
              PPBUS_S5_HS_COMPUTING_ISNS 8.15v
              PPDCIN_G3H 14.89v
              PPDCIN_G3H_ISOL 14.88v
              PP3V42_G3H 3.41v
              PPVRTC_G3H 3.3v should be 3v
              PP5V_S5 5.13v
              PP5V_SUS 5.13v
              PP5V_S3 5.13v
              PP5V_S0 5.03v
              PP3V3_S5 3.33v
              PP3V3_S4 3.34v
              PP3V3_SUS 3.33v
              PP3V3_SW_TBTAPWR 3.33v
              PP3V3_S3 3.34v
              PP3V3_S0 3.33v
              PP1V8_S0 1.79v
              PP1V5_S3 1.35v instead of 1.5v
              PP1V5_S3RS0 1.35v instead of 1.5v
              PP1V5_S0 1.51v
              PPVTTDDR_S3 0.67v instead of 0.75v
              PP0V75_S0_DDRVTT 0.67v instead of 0.75v
              PPVCCSA_S0_CPU 0.85v instead of 0.9v
              PP1V05_SUS 1.05v
              PP1V05_S0 1.06v instead of 1.05v
              PP1V05_S0_PCH_VCCADPLL 1.05v
              PPVCORE_S0_CPU 0.83v instead of 1.25v
              PPVCORE_S0_AXG 0v this in diode mode has 0.0040v is this counted as a short to ground?
              PP1V5_S3_CPU_VCCDQ 1.35v instead of 1.5v
              PP1V05_S0_CPU_VCCPQE 1.06v
              PP1V8_S0_CPU_VCCPLL_R 1.79v

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              • #22
                I found two resitors stuck together around SMC/ISL6259. When I replace the SMC I touch them and now the PPVCORE_S0_CPU is 1.11v instead of 1.25v

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                • #23
                  Did that solve the issue?

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                  • #24
                    no i just solve the PPVCORE_S0_CPU that was 0.83v and now is 1.11v
                    the problem it looks to be here:
                    PPVCORE_S0_AXG 0v and in diode mode has 0.0040v is this counted as a short to ground?

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                    • #25
                      OK, just to be clear now. The machine works but it is just running slow? ASD no errors and battery not recognized?

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                      • #26
                        the machine is turning on and I have a fan spin but no chime no video

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                        • #27
                          I have no ideas. You replaced the SMC and now it is dead. Logic says that is where it went wrong. Donor SMCs do have a tendency to be bad, or you moved a resistor/cap.

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