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  1. 2informaticos

    820-02773 A2338 M2 5v 0.05a

    You have all MPMU LDOs on page 37. Check the input voltages on left side and LDOs on right side. Do the same for SPMU, page 32.
  2. 2informaticos

    A2338 M2 820-02773 5v 0.10ma

    All other M/SPMU LDOs are present? If isn't recognized in DFU, you may have problems with CPU. Just in case, compare diode mode readings around UF400/500 with good board. Check their LDOs with charger alone.
  3. 2informaticos

    820-02773 A2338 M2 5v 0.05a

    There are more LDOs available. You may have just a small capacitor, or resistor corroded somewhere. But also is possible to have more damage; maybe corrosion under some BGAs. Is the machine recognized in DFU mode?
  4. 2informaticos

    A2338 M2 820-02773 5v 0.10ma

    Check diode mode to ground on all secondary voltages. Test the board alone on the desk. Is the machine recognized in DFU mode?
  5. 2informaticos

    820-03285 no keyboard no trackpad

    You've said the connection board was also changed. Where is the short then? Post its exact resistance to ground, in ohm scale.
  6. 2informaticos

    820-01814 no image

    Any history available? Tested with known good screen? What about U8500/1 voltages? Any of them pulsing at least?
  7. 2informaticos

    820-02773 A2338 M2 5v 0.05a

    Check all MPMU LDOs; voltage and diode mode. Don't bother with "NC" ones...
  8. 2informaticos

    820-02100 no backlight

    Be sure all resistors from backlight circuit are good. Check their traces and solders too. Testing with known good screen is still the best option. JP600 gets 1V8_S2?
  9. 2informaticos

    820-01521 stuck 5V draw 0,358A

    Just be sure to have the same code termination.
  10. 2informaticos

    Apple MacBook Pro / A2141 /No Boot / No Display Output / 20v 2.7a /

    Did you test in safe mode?
  11. 2informaticos

    820-03285 no keyboard no trackpad

    "when the keyboard board is connected there is short, disconected small board - no short" Can you post a pictures of the "small board"?
  12. 2informaticos

    820-03285 no keyboard no trackpad

    So power button is corroded. Test with known good keyboard.
  13. 2informaticos

    820-02037-A Nand Shorted

    Master Liu will send you 1TB chips initialized for your exact 820-02037-A board model. The chips are marked, so you can solder them in the proper position. DFU restore will finish the job. Just be sure to order the correct SSD size for your machine!
  14. 2informaticos

    Diagnosing 2012 13' Unibody Pro

    Once power is removed, always allow 10-15s before measuring in ohm scale, or diode mode. This gives time the capacitors to discharge remanent voltages. What is exact PPBUS_G3H voltage with charger alone (no battery)? Did you try to start in SMC bypass mode?
  15. 2informaticos

    820-02037-A Nand Shorted

    You can buy with confidence here: https://www.masterliuonline.com/products/a2141-nand-ssd-chip
  16. 2informaticos

    A2338 Stuck at 5V (820-02020)

    Strange to get 1V8_AON_MPMU, but no other MPMU's LDO present. If diode mode readings on these LDOs are good, you should change U8100.
  17. 2informaticos

    A2338 Stuck at 5V (820-02020)

    Check diode mode to ground on missing voltage rails. Compare readings with good board.
  18. 2informaticos

    820-02100 no backlight

    12V on backlight output may be caused by bad UP800. But other adjacent components may impede it, or QP800-3 to boost up the voltage.
  19. 2informaticos

    820-00281-A 20v-1.05a

    Where did you get the new BIOS file? Just in case... https://drive.google.com/file/d/1xXgXuUDgPLgQTYbM_3qnRzQuAbLZfM15/view?usp=sharing https://drive.google.com/file/d/1MjiFvpavU1hEerrDCWTgQBUsMfAzc8Tt/view?usp=sharing
  20. 2informaticos

    820-03285 no keyboard no trackpad

    That's bad; what about diode mode?
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