Macbook Air A2337, 820-02016-A stuck at 5V

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  • Jonnx
    New Member
    • Apr 2019
    • 3
    • Switzerland
    #1

    Macbook Air A2337, 820-02016-A stuck at 5V

    Hello everybody,

    I have seen a lot of posts about the A2237/A2338 about the 5V not boosting up to 20V issue, but none of them seem to have the exact problem as my board does.

    My PPBUS_AON was measuring ~9.32V and the board kept power cycling, so I removed the fuse F5200 to measure PPVBAT_AON_CHGR_REG and indeed it was still 9.32V, but the board stopped power cycling. Then I measured U5200 values and got this:

    U5200:
    PPDCIN_AON_CHGR_R = 5.144V
    AUX_DET = 1.287V
    VDD = 2.767V
    VDDP = 2.767V
    AUX_OK = 0.848V
    AMON = 0V
    BMON = 0V​

    I think what stands out the most are the low VDD/VDDP values, which I know should be around 5V.
    Is the next step to remove U5200? I would like to be absolutely certain there are no more possible culprits before attempting to remove it, as I am not that experienced yet with BGA repairs.

    Thank you all for your time.
    Tags: None
    • mon2
      Badcaps Legend
      • Dec 2019
      • 13877
      • Canada
      #2
      MacBook Air A2337 Not turning on, current draw cycling between 0.00 and 0.45a at 5V repair - Repair Wiki​

        Comment

        • Jonnx
          New Member
          • Apr 2019
          • 3
          • Switzerland
          #3
          Hello,

          Thank you very much for your answer. I thought I had seen that post already, but to make sure I went ahead and measured and wrote down my findings:
          1. L8100 / L8101 / L8102 (PPVDD_PCPU_AWAKE) (Figure 1) - Normal diode mode to ground reading ~0.033 / ~31.3Ω (Resistance)
          2. L82B0 / L82B1 (PPVDD_ECPU_AWAKE) - Normal diode mode to ground reading ~0.120 / 119.1Ω (Resistance)
          3. L8270 / L8271(PPVDD_CPU_SRAM_AWAKE) - Normal diode mode to ground reading ~ 0.241 / 240.6Ω (Resistance)
          4. L8120 (PPVDD_SOC_S1) - Normal diode mode to ground reading ~ 0.04 / 39.5Ω (Resistance)
          5. L8110 / L8111 / L8112 (PPVDD_GPU_AWAKE) - Normal diode mode to ground reading ~ 0.044 / 43.5Ω (Resistance)
          6. L8280 / L8281 (PPVDD_DISP_S1) - Normal diode mode to ground reading ~ 0.208/ 207Ω (Resistance)
          7. L8290 (PPVDD_DCS_S1) - Normal diode mode to ground reading ~ 0.277 / 276.5Ω (Resistance)
          8. L84E0 - (PP1v4_LDO_PREREG) - Normal diode mode to ground reading ~ 0.301 / >170kΩ and climbing (Resistance)
          Although the values sometimes don't seem to really match the ones in the post, I am nevertheless not getting a short anywhere.

          But i noticed something weird. With the battery and the charger connected, I thought the SYS_DETECT_L was supposed to get pulled low, but instead I get random voltage jumps in the <1V region and therefore PP3V8_AON_VDDMAIN and all inherited voltages aren't present.

          Does this mean that something could be wrong with the battery? I am a bit stumped.

          Have a nice week
          Jonnx

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