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  1. 2informaticos

    A2251 820-01949 No power 5V 0A

    "if I am not mistaken U6903 needs PPBUS_G3H in order to generate 3V3_G3H_RTC" Yeah, big mistake...
  2. 2informaticos

    Macbook A1398 820-00136

    3V3_S5/SUS come high?
  3. 2informaticos

    820-02016 5V 0,04A

    Any of bucks voltage appears?
  4. 2informaticos

    Macbook A1990 820-01041 SSD

    You've probably find shorted NAND chip. Anyway, nothing to loose injecting voltage. A very low chance of shorted cap still exists...
  5. 2informaticos

    Macbook A1398 820-00136

    If PM_PWRBTN_L stays high, the problem may be SMC related. SMC_ONOFF_L stays high normally? Did you test the board alone on the desk? What about SMC bypass?
  6. 2informaticos

    Apple MacBook Pro / Model A1990 / 820-01041-A / 5v .03a /

    Check diode mode to ground at PPBUS_G3H and corresponding SSD power rails.
  7. 2informaticos

    Macbook A1398 820-00136

    Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L (at same time). Did you try SMC bypass?
  8. 2informaticos

    A1707 with software update needed error

    Check touchbar connector and corresponding traces.
  9. 2informaticos

    A1466 820-00165 No Magsafe

    Machine works now?
  10. 2informaticos

    MACBOOK A1466 PPBUS 8.2V NO MAGSAFE

    I expected voltages...
  11. 2informaticos

    820-02016 5V 0,04A

    Check diode mode on BUCKxx outputs of U8100 & U7700.
  12. 2informaticos

    A1466 820-00165 No Magsafe

    As per formula mentioned on the page, Ra/Rb controls output voltage. Enough to modify one resistor...
  13. 2informaticos

    MACBOOK A1466 PPBUS 8.2V NO MAGSAFE

    Voltage level is OK; only right side page.
  14. 2informaticos

    820-02016 5V 0,04A

    You can't access DFU without 1V25_S2. Check U8100 and U7700 LDOs; voltage and diode mode.
  15. 2informaticos

    A2779 820-02841-A black screen but not in recovery

    What customer said about fault appeared?
  16. 2informaticos

    A2251 820-01949 No power 5V 0A

    U7000 requires to communicate with T2, in order to generate PPBUS_G3H. Do you get 3V3_G3H_RTC? Did you check CHGR_RST_IN?
  17. 2informaticos

    Macbook pro A1990 (820-01814-A) Stuck on 5V

    I'm lost now; when did you mention short on 0V9_SSD0? Diode mode readings -> ALWAYS with red probe on ground! Very rare we need to use it in reverse way... https://openboarddata.org/?a=showboardsolutions&bpath=laptops/apple/820-01814
  18. 2informaticos

    A1466 820-00165 No Magsafe

    PPBUS_G3H voltage? Check SMC (2 OF 2) power rails and signals (page 37). Play with Ra/Rb (page 49) and try to adjust 3V42_G3H.
  19. 2informaticos

    MACBOOK A1466 PPBUS 8.2V NO MAGSAFE

    What about diode mode readings at SCL/SDA lines of battery bus? Check power rails and signals of SMC (2 OF 2) from page 37.
  20. 2informaticos

    A2779 (820-02841-A) Gets 20V, 5V->20V handshake loops and does not boot. Can enter DFU. Liquid Damaged.

    Think if is worth to spend more time on it. Will customer accept the machine without embedded WiFi? Needs to connect external adapter...
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