MacBook Pro 2019 A2141 820-01700 NAND Issue Stuck in DFU

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  • cheebster
    Badcaps Veteran
    • May 2008
    • 360
    #1

    MacBook Pro 2019 A2141 820-01700 NAND Issue Stuck in DFU

    MacBook Pro 2019 A2141 820-01700 NAND Issue Stuck in DFU

    Ok, here's an issue ive got on a A2141 820-01700 MBP 16' 2019. No signs of life, 5.06v 0.0a on usb-c meter, on each 4 usb-c ports.

    Nand voltages are missing.

    I've found no shorts at all so far, no signs of heat via thermal camera either.

    PPBUS_G3H 12.31
    PP3V3_G3H_RTC 3.387v
    PP3V3_G3H 12.31v
    PP2v5_NAND_SSD0 0v 58 ohms
    PP2v5_NAND_SSD1 0v 57.8 ohms
    PP1v8_SLPS2R 1.8v
    PP1v1_SLPS2R 1.1v
    P3V3_G3H_SOCPMU 3.37v
    PP0V9_SLPDDR 0.9v

    P3v3_UPC_XA LDO 3.3v
    PP3v3_UPC_XB_LDO
    PP3v3_UPC_TA_LDO
    PP3v3_UPC_TB_LDO
    PP3v3_G3H_T

    Tried revive and restore via apple configurator, fails every time with 4014. Device is detected in DFU mode without me forcing it, booting into it by itself, but i've noticed P2v5_NAND_SSD0/P2v5_NAND_SSD0 ramping up to 2.5v 1 second when trying restore/revive, then back to zero. So it's trying to power on the NANDS, but shutting them off after.

    Anyone has an idea at this point ? Thanks.
    Tags: None
    • cheebster
      Badcaps Veteran
      • May 2008
      • 360
      #2
      Re: MacBook Pro 2019 A2141 820-01700 NAND Issue Stuck in DFU

      Sorry for the missing values for the tests.. the ldo's are all 3.3v.

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