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Water damaged A1398 boots (w/chime) to black screen, dies when booting from ext hdd

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  • Water damaged A1398 boots (w/chime) to black screen, dies when booting from ext hdd

    My first post so be gentle.

    15" MBP Retina (late 2012)... water damage took out the I/O Board (melted the I/O cable). Removed cable and board. Also killed the SSD (wouldn't boot from another Retina). Localized corrosion removed. Applied power and attempted boot from external usb hdd. Dies after 3-5 seconds of power. Reset SMC and PRAM. Fans now on high, but still dies after 3-5 seconds. Ran Apple HW test. Shows "no problems with the logic board."

    Huh?

    Won't boot to Safe Mode.

    Starts booting to Recovery but as soon as it looks for a place to install, total shutdown executes.

    My brain says SMC. Will SMC operate as normal with no I/O board? Waiting for a replacement board and cable.

    Many thanks to all kind responses.
    Last edited by wedge07; 06-08-2016, 01:09 PM.

  • #2
    I believe this should at least boot without IO board. ASD should report a sensor issue if your fan is running high.

    I have had these shutdown issues as soon as Apple logo appears. It was a corroded pad under one of the PWM chips of the CPU Vcore power supply

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    • #3
      check for long screw damage on CPU heatsink screwholes

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      • #4
        Originally posted by dukefawks View Post
        I believe this should at least boot without IO board. ASD should report a sensor issue if your fan is running high.

        I have had these shutdown issues as soon as Apple logo appears. It was a corroded pad under one of the PWM chips of the CPU Vcore power supply
        Looked and noted I didn't clean as well as I could have. My CP500HT comes in on Monday. Will try another cleaning...

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        • #5
          Originally posted by larossmann View Post
          check for long screw damage on CPU heatsink screwholes
          Looked at all 8 and the underlying board remains undamaged. Thoughts? Is this a voltage runaway problem?

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          • #6
            Where was the original water damage?

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            • #7
              Originally posted by dukefawks View Post
              Where was the original water damage?
              The original damage was on the I/O Board and Cable. Went up in smoke. Initially removed the board and everything seemed to be working after a cursory cleaning but then it started spontaneously powering off after reading on the internal SSD for about 2 minutes. Then the SSD completely self-destructed and I removed it. That's why tried to boot it off the external. I haven't applied power since the external died after 4 seconds.

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