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  1. 2informaticos

    820-01700 not booting

    I never did such change, so I don't know if really need to change something. Compare the position for the resistors from page 6.
  2. 2informaticos

    820-01700 not booting

    Usually CPU core starts with 1-1.1V and drops in few steps until 0.6-0.7V in 5-10s. If donor board resistors are placed in the same manner as your board, then direct CPU swap should be supported.
  3. 2informaticos

    820-3462 no green light no fan

    Check C4901/02/10 voltages. Just in case, check AVREF_SMC voltage too. You may need to change SMC.
  4. 2informaticos

    A2338 no backlight.

    Is the data line for backlight control; between CPU and T-CON. I don't think changing CPU is an option; better to buy another machine. You can still use this one with an external monitor/TV.
  5. 2informaticos

    820-02773-a A2338

    https://openboarddata.org/?a=showboardsolutions&bpath=laptops/apple/820-02773
  6. 2informaticos

    820-00165 - PP5V_S4RS3 8v

    First, check for short between pins 1-8 of Q7520. Next, check correct values (ohm scale) of R7520/1/3 and their traces.
  7. 2informaticos

    820-3462 no green light no fan

    Check diode mode and voltage on SCL/SDA lines of battery bus. Post U7201 basic voltages: pins 23, 22, 12, 13, 29, 21.
  8. 2informaticos

    820-00165 Fan full throttle but CPU frequency normal

    Try with preinstalled USB macOS. Disconnect internal SSD for test. Did you try another LIO and trackpad board/flex ?
  9. 2informaticos

    820-01700 not booting

    Schematic alone probably doesn't help. Check the CPU's donor board configuration. BTW, what is CPU core behavior? It should drop from 1V to 0.6V aprox.
  10. 2informaticos

    A2338 no backlight.

    Usually 50V means no connection to LED strips. Sometime this issue may be solved by DFU restore; if no electronic problem is found. First check continuity between MLB and T-CON board. You may have bad video connector on the MLB (JP600), or broken trace.
  11. 2informaticos

    820-00165 Fan full throttle but CPU frequency normal

    Post the error code...
  12. 2informaticos

    820-00165 Fan full throttle but CPU frequency normal

    Any error pops up starting in diagnostic mode?
  13. 2informaticos

    820-02773-a A2338

    "LC710 : 2.2 volt" Bad; CC715 should have 3.3V. No reason to check backlight circuitry, until get correct voltage there. Compare diode mode to ground reading with good board. Check all resistors (RC709-13) and traces from feedback network.
  14. 2informaticos

    820-4924A magsafe orange no fan spin

    It should boot with other SMC. Then you have to reflash it. https://github.com/MuertoGB/SMCTool
  15. 2informaticos

    Macbook A1502 PPBUS 0V

    Q7180 area looks good. I hope the traces from resistors to it are all goods. Did you try another DCIN board?
  16. 2informaticos

    Macbook A1502 PPBUS 0V

    Then you have leakage problem. Post R7180/1 and R7185/6 values (ohm scale), measured onboard. Also check/replace R7010/12 and D/Q7010.
  17. 2informaticos

    A3113 / 820-03285 liquid damaged

    You may have corrosion inside, or underneath the battery connector.
  18. 2informaticos

    Macbook A1502 PPBUS 0V

    Check 3V42_G3H and PPBUS_G3H voltage with lab PSU.
  19. 2informaticos

    820-2098 stuck 5v liquid damage

    Check diode mode readings around it; compare with good board.
  20. 2informaticos

    A2681 820-02536 no power

    You can probably find similar coil on some iPhone boards. But MPMU (U8100) is also suspect.
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