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  1. 2informaticos

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

    Possibly overvoltage on 3V8_AON rail, caused by lekage from backlight area. There may be more chips damaged...
  2. 2informaticos

    820-01041 - 20v 0.02a

    Intel side power sequence starts after SSD gets voltages. T2 needs to run its boot software from SSD.
  3. 2informaticos

    A1466 820-00165 No Magsafe

    Diode mode to ground at 3V42_G3H? Still low voltage disconnecting LIO flex, SSD and airport?
  4. 2informaticos

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

    Just backlight not working. However, image MUST appear first. If no image, no reason to check for backlight. Backlight is always delayed to avoid any artifact, until video communication is stable.
  5. 2informaticos

    820-01041 - 20v 0.02a

    SSD may have internal NAND failure. These chips have life time limited by years (5-10), or writen bytes. Sometime die without any reason...
  6. 2informaticos

    A1932 - no image , no backlight

    No reason to force backlight enable signal. PCH will not send any video signal to LCD assembly if HPD signal stays low.
  7. 2informaticos

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

    Which power rail was shorted to ground?
  8. 2informaticos

    A2141 820-01700 no power

    Yes, but must be compatible version with SSD size.
  9. 2informaticos

    A2141 820-01700 no power

    STOP checking DC voltage on input pin of a coil from buck converter.
  10. 2informaticos

    A1990 820-01041 - Stuck at DFU, error code 6 on restore

    Humidity on SSD power supply area is not good. Did you try DFU revive with charged battery and trackpad connected? Checked all secondary power supplies?
  11. 2informaticos

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

    If WiFi chip is dead, can't be replaced; it is married with CPU. In such case, think if is worth to continue with this board. Possibly problems appeared reballing U7700, or heat applied on the board affected something else.
  12. 2informaticos

    820-01041 - 20v 0.02a

    Any history available? Do you get all G3S and SSD voltages? Check diode mode on all secondary power rails. BTW, SMC_RST* is not used.
  13. 2informaticos

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

    Use a good thermal camera...
  14. 2informaticos

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

    After 1 minute, disappear both image and backlight?
  15. 2informaticos

    A2141 820-01700 no power

    Your problem may be T2, or SSD...
  16. 2informaticos

    A1707 with software update needed error

    Test with known good touchbar.
  17. 2informaticos

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

    "(6.1A at 1.2V)" This means 7W aprox, something should go really hot. Be sure to inject voltage in the correct points. Use powerful cables; you want to heat something on the board, not the cables. BTW, set PSU amp limit to max first.
  18. 2informaticos

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

    Power on sequence for T2 machines is very complex. Sometime SSD voltages can come back after DFU. Check diode mode to ground on SSD power rails; compare with good board. Do the same for all secondary power rails.
  19. 2informaticos

    SOLVED A2918 820-02757 - Turns on and shuts off mid-loading after replacing shorted amp

    Always note diode mode reading (as refference), not ohm scale; red probe on ground, of course.
  20. 2informaticos

    A1707 with software update needed error

    Can you load macOS in safe mode?
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