Macbook a2337 820-02016 stuck on 5v fluctuating voltage

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  • erickirchey
    Prem Supporter
    • Aug 2022
    • 24
    • USA
    #1

    Macbook a2337 820-02016 stuck on 5v fluctuating voltage

    I am learning any help is appreciated I have a macbook 820-02016 that is stuck on 5v
    I tested voltage on PPBUS_AON i get 12.6v and it drops to 11.3v I removed fuse f5200 pin 1 PPVBAT_AON_CHGR_REG Becomes stable and no longer fluctuates
    Pin 1 on f5200 is .51 in diode mode
    pin 2 is .46
    Im not sure where to go from here any guidance would be appreciated!
    Tags: None
    • CuriousDave
      Member
      • Aug 2024
      • 11
      • USA
      #2
      Did you check the CD3215 and CD3217? There is still not enough information to do guess work. What is the voltage and current on the USB volt meter? Please start from there and test the always present if the input is at 20V. Otherwise hard to tell what is missing and what caused it. Is that liquid damaged or just died itself like many others with dead NAND chips?

        Comment

        • erickirchey
          Prem Supporter
          • Aug 2022
          • 24
          • USA
          #3
          Voltage meter before removing fuse was stuck at 5v .03a-.01a fluctuating after removing its sits at 5v .01a
          To test cd3217 I checked voltage on
          PPDCIN_AON_CHGR_R of both ports and received 5v on both
          PP3v3_UPC0_LDO 3.3
          PP1v5_UPC0_LDO_CORE 1.5v
          PP3v3_UPC1_LDO 3.3
          PP1v5_UPC1_LDO_CORE 1.5v

            Comment

            • CuriousDave
              Member
              • Aug 2024
              • 11
              • USA
              #4
              Please check NAND and every AON rail.AON means always on that killed many machines.

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